Notes on some species of Rhynchosia (Leguminosae- Papilionoideae) from NE Africa and Yemen

Mats Thulin

Thulin, M. 198 1. Notes on some species of Rhynchosia (Leguminosae-Papilono- ideae) from N E Africa and Yemen. - Nord. J . Bot. I : 37-42. Copenhagen. ISSN 0307-05sx.

Rhynchosia Java (Forsk.) Thulin comb. nov. (= Ononis frava Forsk.) is a narrowly endemic species in Yemen. Since it was originally collected by ForskAl in 1763 it has apparently not been recollected until a few years ago. Description, typification and distribution map are provided for this species as well as for the closely related Ethio- pian species R. erythraeae Schweinf. and R . erlangeri Harms. R. malacotricha Harms, another little-known Ethiopian species, is shown to be closely related to R. sublobata (Schumach.) Meikle. R . verdcourtii Thulin sp. nov., occurring in S Ethiopia, N Uganda, Kenya and N Tanzania, is described, illustrated and mapped.

M. Thulin. Insr. of Systematic Botany, Univ. of Uppsala, Box 541, S-751 2I Uppsala, Sweden.

Introduction

In this paper descriptions, typifications, notes on taxonomy, and distribution maps are given for five little-known or new species of Rhynchosia Lour. from NE Africa and Yemen. The three species treated first are closely related, while the remaining two are not al- lied to the others. All cited material has been examined by the author.

R. flava (Forsk.) Thulin comb. nov.

Ononisfrava ForskAl 1775:130. - Orig. coll.: Yemen, Djobla, April 1763, ForskAl s.n. (C lectotype, selected here).

Christensen (1922:24) stated that at that time no specimen of 0. fluva was present in Herb. Forskll at C. In the introduction to his paper he mentioned that when he started to rearrange Forskbl’s herbarium in 1916 all Leguminosae were lacking in it but that he had man- aged to find most of them in the general herbarium (Christensen 1922:s). Two sheets of 0. fravu are now present in Herb. Forskll and evidently they were pre- sent in the general herbarium of C at the publication of Christensen’s paper. One of them, beside the annota- tion “Coll. Forskbl” and the name 0. fluvu, also bears the name “Glycine rotundifoliu”. This represents the

most well-preserved specimen and is here selected as the lectotype.

Erect much-branched shrub, up to ca. 0.6 m tall. Branches ridged, shortly tomentose when young. Leaf- lets 3, broadly ovate or obovate to suborbicular, the laterals oblique, 6-25 X 5-23 mm, acute to rounded at the apex, truncate to cuneate at the base, sparsely puberulous above, more densely so beneath, particu- larly on the veins, but foliage still appearing green, densely gland-dotted on both surfaces; venation pro- minent beneath, narrowly reticulate; petiole 3-14 mm long, usually much longer than the rhachis; petiolules 1-2 mm long; stipels ca. 1 mm long; stipules ovate- acuminate, ca. 2-5 X 1-2 mm, brown, pubescent, rather long persistent. Inflorescences axillary with fairly densely set flowers, 2-5 cm long, including a peduncle of up to 1 cm; pedicels ca. 2 mm long, pubescent; bracts ovate or ovate-acuminate, 1.6-4 x 0.8-2 mm, brown, pubescent, caducous. Calyx pubescent and densely gland-dotted; tube 2-2.5 mm long; lobes lanceolate- oblong, 2.5-5 mm long, the lowest usually the longest, the upper pair joined for 213-3/4 of their length. Stan- dard yellow with brownish veins or f flushed brownish, 11-13 x 8-10 mm, auriculate, without appendages on the inner face, pubescent and densely gland-dotted outside; claw 2-2.5 mm long. Wings somewhat shorter

0 NORDIC JOURNAL OF BOTANY NORD J BOT I 37-42, TROP on3

Nord J Bol l(1) 1981 37

than the keel; blade narrowly oblong, distinctly auricu- late at the base; claw 2-2.5 mm long. Keel-blades broadly oblong, with a pocket on the outside near the base; claw 2-2.5 mm long. Anthers ca. 0.8 mm long. Ovary oblong, pilose and gland-dotted; style 10-12 mm long, pubescent except on the thickened, upcurved, distal part. Pod oblong, ca. 13-17 X 5 mm, covered with long as well as short hairs and densely gland- dotted. Seeds (1-)2, broadly oblong, 3.2-3.5 X 2.8-3 X 2 mm, grey or pale brown with dark grey and blackish mottling.

Distribution and habitat. The species is known only from a few mountains in Yemen where it occurs on grassy slopes and along the margins of fields, frequently be- tween rocks (Fig. 1A); alt. 2000-2800 m.

Taxonomic comments. Apparently the original material of 0. flava has escaped the attention of earlier botanists partly because the material for a long time was placed in the general herbarium (see above) rather than in the Forsk&l herbarium and partly because no other material of the species has been available for comparison. Since Forsk&l collected the species in 1763 it does not seem to have been recollected until in 1975 when it was found by both J . R. I. Wood and F. N. Hepper in Jibla in Yemen. This locality, furthermore, is identical with ForskPl’s original locality “Djobla”. The closest relative of R. flava is another shrubby species, R. erythraeae Schweinf. (see below) in the highlands of Ethiopia. R. Java differs from this in its sparser pubescence and the much more prominent gland-dots on the leaves, calyces and pods and on the outside of the standard. Owing to the sparser pubescence, the leaves of R. flava are green on both sides, while in R. eryrhraeae they are silvery at least on the lower side. The leaves are also in general proportionally wider and more rounded in R. flava and in addition the flowers are in all parts somewhat smaller and the stipules wider in R. Java than in R. erythraeae.

Collections orher than the fype. Yemen. Jibla, between Nagd al Ahmar and Jebel Taaqa, 30 May 1975, Wood 751242 (K) ; Jibla, 14”55’N, 44”08‘E, 26 October 1975, Hepper 6087 (C, K); S of summit of Jebel Ayfu, 8 August 1977, Radcliffe-Smith and Henchie 4539 (K); At top of pass over main escarpment on Medinat al Abid road, 7 September 1977, Radcliffe-Smith and Henchie 5028 (K); On the inner escarpment at Anis on the Medinat a1 Abid road, 7 September 1977, Wood 1960 (K).

R. erythraeae Schweinf. Schweinfurth 1896:258; Chiovenda 1903:101, 1908:440; Baker 1929:487; Cufodontis 1955:322. - Orig. coll.: Ethiopia, Eritrea, Mt Bizen, 10 May 1892, Schweinfurth 1850 (B syn- type t, K lectotype, selected here, FT, P, S isolectotypes).

Erect much-branched shrub, up to 1 m tall. Branches ridged, the younger parts shortly silvery tomentose. Leaflets 3, elliptic to rhomboid or broadly ovate, the laterals oblique, 10-38 X 6-25 mm, acute or subacute at the apex, truncate to cuneate at the base, sparsely to densely appressed pubescent above, densely appressed silvery pubescent beneath, gland-dots present but scarcely visible; venation prominent beneath, narrowly reticulate; petiole 3-15 mm long, usually much longer than the rhachis; petiolules 1-2.5 mm long; stipels ca. 1 mm long; stipules lanceolate, ca. 3-5 x 1 mm, brown, pubescent, rather long persistent. Inflorescences axil- lary with fairly densely set flowers, 3-7 cm long includ- ing a peduncle of up to 2.5 cm; pedicels ca. 2 mm long, white pubescent; bracts lanceolate to ovate, ca. 2.5-3 X

1-1.5 mm, acute, brown, pubescent, caducous. Calyx appressed silvery pubescent and gland-dotted; tube ca. 3 mm long; lobes lanceolate-oblong, 4-7 mm long, the lowest the longest, the upper pair joined for 112-213 of their length. Standard yellow with brownish veins, 14-15 X 9-1 1 mm, auriculate, without appendages on the inner face, densely silvery pubescent and gland- dotted outside; claw 2-2.5 mm long. Wings somewhat shorter than the keel; blade narrowly oblong, distinctly auriculate at the base; claw ca. 2.5 mm long. Keel- blades broadly oblong, with a pocket on the outside near the base; claw ca. 2.5 mm long. Anthers ca. 1 mm long. Ovary oblong, densely pilose; style ca. 12 mm long, pubescent except on the thickened, upcurved, distal part. Pod often f enclosed by the marcescent corolla, oblong, ca. 13 x 5 mm, with densely appressed silvery pubescence consisting of long and short hairs. Seeds (1-)2, broadly oblong, 3.2 X 2.8 X 2 mm, reddish brown, mottled black.

Disrribution and habitat. The species is known only from the highlands of Eritrea and the isolated Mt Fantale in Shoa Region (Fig. 1A); alt. 1000-2000 m.

Taxonomic comments. The material available of R. erythraeae is very homogeneous and the only variation worth mentioning is in the pubescence. Normally the leaves are silvery pubescent beneath and more sparsely pubescent and green above. However, in one collection, Fiori 696, the pubescence is denser and the leaves are appressed silvery on both sides, thus approaching those of the apparently closely related species R. splendens Schweinf. (1868). R. splendens is still known only from its type collection, Schweinfurth 1870 (B holotype t , BM, P isotypes) which originates from Gallabat, Matamma on the SudadEthiopia border. It differs from R. erythraeae mainly in its larger leaflets (up to 55 x 30 mm), which are very densely tomentose on both sides and, owing to the dense indumentum, have a less prominent venation on the lower side. Furthermore the stipules seem to be shed at an earlier stage in R. splen- dens than in R. erythraeae. Verdcourt (1971:753) pointed out the resemblance between R. splendens and

38 Nord. 1. Bot. l (1) 1981

Fig. 1. Known distributions of some species of Rhynchosia. - A: R. Java (O) , R. erythraeae (W) and R. erlangeri (+). - B: R. malacotricha (H) and R. verdcourtii (0 a n d o , the latter prob- ably introduced).

R. albissima Gand. (1913). R. albissima is a fairly widespread species in E tropical Africa although not known from Ethiopia. Despite a similarity in habit it differs from both R. erythraeae and R. splendens in some floral characters: the standard is provided with small wart-like appendages on the inside near the base, and the standard also seems to have proportionally longer auricles and claw. A reliable judgement of the affinities of R. splendens must await further material, including fruits which are now unknown. For the present it is certainly advisable to keep it as a distinct species along with both R. erythraeae and R. albissima. For the dis- tinction between R. erythraeae and R. Java see under the latter species.

Collections other than the types. Ethiopia. Eritrea, Ghinda, 1 September 1892, Ragazzi 161 (IT); Rora Ualicaue, 8 January 1893, Terracciano and Pappi 1749 (IT), 9 January 1893, Terracciano and Pappi 703 (FT); Laghetto di Minat-Valle Urug, 22 March 1893, Pappi 3385 (IT); Monti Lesa, 6 April 1902, Pappi 4719 (IT), 25 April 1902, Pappi 4487 (IT), 20 January 1909, Fiori 696 (IT), September 1916, Baldrati 4281 (FT); Uochi, 8 November 1914, Baldrati 884 (IT); 23.1.1915, Baldrati 4321 (FT). Shoa, Mt Fantale, top of crater rim track, 13 July 1969, Gilbert 1395 (K) .

R. erlangeri Harms Harms 1907:40; Baker 1929:487; Cufodontis 1955:322. - Orig. coll.: Ethiopia, Harar Region, Gara Mulata Mt, March 1900, Ellenbeck 537 (B, holotype f); ibid., 21 km on the Bedenc-Anya road, 27 October 1967, Westphal2463 (WAG neotype, selected here, C isoneotype).

Erect shrub, ca. 0.5-1.5 m tall. Branches ridged, gland-dotted and shortly pubescent, densely so on the ridges. Leaflets 3, rhomboid or ovate to suborbicular or oblate, the laterals k oblique, 1 0 4 5 X 8-30 mm, rounded to acute at the apex, truncate to broadly cuneate at the base, minutely puberulous to finely pubescent, particularly on the nerves above, puberulous to finely pubescent beneath, gland-dotted on both sides or beneath only; venation very prominent beneath, narrowly reticulate; petiole 2-5 mm long, usually shor- ter than the rhachis; petiolules 1.5-2 mm long; stipels ca. 1.5 mm long; stipules lanceolate to narrowly ovate, ca. 3-5 X 1-3 mm, brown, pubescent, persistent. In- florescences axillary with fairly densely set flowers, 2-3 cm long, subsessile or on peduncles up to 1.5 cm long; pedicels ca. 2 mm long, pubescent; bracts broadly ellip- tic to broadly obovate, 4-8 X 3-5 mm, shortly acute, pubescent and gland-dotted, caducous. Calyx pubescent and gland-dotted; tube 3-3.5 mm long; lobes lanceol- ate-oblong, 5-10 mm long, the lowest the longest, the upper pair joined for * half their length. Standard yel- low with brownish veins, elliptic-obovate, 14-19 x

Nord. J . Bol. l ( 1 ) 1981 39

9-1 1.5 mm, auriculate, without appendages on the in- ner face, pubescent and gland-dotted outside; claw 3-3.2 mm long. Wings orange, equalling the keel; blade oblong-oblanceolate, shortly auriculate at the base; claw 3 . 5 4 mm long. Keel yellow; blades oblong, with a pocket on the outside near the base; claw 3.5-4 mm long. Anthers 1-1.2 mm long. Ovary oblong, pilose; style ca. 12-16 mm long, spreadingly pubescent except on the thickened, upcurved, distal part. Young pod f enclosed by the marcescent corolla, oblong, ca. 13 x 3 mm, spreadingly pilose and densely gland-dotted.

Distribution and habitat. The species is only known from Ethiopia, where it has been collected three times in the highlands of Harar Region (Fig. 1A). It grows in scrub, on grassy slopes or between rocks; alt. 1840-2600 m.

Taxonomic comments. The recent collections here as- sociated with the name R. erlangeri, apart from having larger and more acute leaflets, agree well with the original description and indicate that this is a distinct species closely related to R. erythraeae with which it was also compared by Harms (1907). Diagnostic to R. er- langeri, according to Harms, are the less hairy and broader leaves. The material now available of the two species displays a complete overlap in the leaf-shape but there is a clear difference in pubescence, since in R . erlangeri the leaves are less pubescent and both sides appear green, while in R. erythraeae they are silvery at least on the lower side. The most important characters which distinguish R. erlangeri from R. erythraeae as well as from R. flava, R. splendens and R. albissima are the short petioles, usually shorter than the rhachis, and the large bracts (4-8 x 3-5 mm as opposed to 1 . 6 4 x 0.5-2 mm in the other species mentioned).

Collection other than the tvues. Harar Reeion. Ahmar Mts. 74 km NW of Asbe Tafari along Harar road,-ca. 9"10'N, 41"04'E, 4 April 1969, J . De Wilde 5771 WAG).

R. malacotricha Harms Harms 1907:41; Baker 1929:481; Cufodontis 1955:323. - Orig. coll.: Ethiopia, Harar/Bale Region, Luku, June 1900, Ellenbeck 1227 (B holotype t); Shoa Region, Mt Fantale, NW slopes, 9"02'N, 39"53'E, 12 April 1969, J. De Wilde 4875 (WAG neotype, selected here).

Robust perennial, k erect shrubby herb, often with climbing branches, 1-3 m tall. Stems densely velvety pubescent with white or yellowish hairs. Leaflets 3, the terminal oblate to rhomboid, the laterals oblique, t broadly ovate, 2.5-11 x 2-9 cm, often slightly lobed, the laterals only on the outer side, rounded to acute at the apex, rounded at the base, densely velvety on both surfaces; petiole 1.5-4 cm long; rhachis 0.5-2.5 cm

long; petiolules 1.5-4 mm long; stipels 1-3 mm long; stipules lanceolate or linear-lanceolate, 5-1 1 x 2 mm, velvety. Inflorescences axillary with fairly densely set flowers, often branched, velvety; rhachis 4-9 cm long; peduncle 2.5-6 cm long; pedicels 1-2 mm long; bracts lanceolate or linear-lanceolate, ca. 5-6.5 x 1 mm, caducous. Calyx velvety; tube ca. 4 mm long; lateral and upper lobes oblong-triangular, ca. 4-5 mm long, the upper pair joined for */3-Y4 of their length, the lower lobe linear-lanceolate, 7-10 mm long. Standard yellow or orange-yellow with purplish veins, obovate, 15-17 x 9-10 mm, auriculate, without appendages on the inside, densely pubescent outside; claw ca. 2.5-3 mm long. Wings orange-yellow, equalling the keel; blade ob- long-oblanceolate, distinctly auriculate at the base; claw ca. 3.5 mm long. Keel yellow, usually purplish at the apex; blades with a pocket on the outside near the base; claw ca. 4.5-5 mm long. Anthers ca. 1 mm long. Ovary pilose; style ca. 11 mm long, pubescent except on the thickened, upcurved, distal part. Pod oblong-falcate, inflated, ca. 30 X 10 mm, narrowed at the base, brown, tomentose. Seeds (1-)2, dark brown, 6-6.4 x 4 .44 .8 X 3 . 8 4 mm, finely roughened.

Distribution and habitat. The species is endemic in Ethiopia, where it is known from the highlands of Harar Region and from Mt Fantale in Shoa Region (Fig. 1B). It grows in grassland or wood/bushland at 1350-2000 m altitude.

Taxonomic comments. Like R. erlangeri, R. malaco- tricha was first collected by Ellenbeck in 1900 (in flower only) and has not been recollected until in the 1960's. Harms (1907) when describing the plant, did not com- pare it with any other species. The material now availa- ble also includes fruits. Judging from the inflated pods and the usually somewhat lobed leaves the species is closely related to the widespread tropical African R. sublobata (Schumach.) Meikle, a prostrate or climbing species. R. malacotricha may be regarded as an f erect and shrubby derivative of this. R. sublobata, which in Ethiopia is known only from Eritrea and Gamu-Gofa Region, is an exceedingly variable species and a clear- cut distinction between the two is not always easy to make. The most prominent differences are summarized in Tab. 1.

Collections other than the types. Ethiopia. Shoa Region, Mt Fantale, 6 November 1967, Bally 13028 (ETH), 1 June 1975, Ash 2978 (K). Harar Region, 5.5 km on the Harar-Jijiga road, 8 April 1968, Westphal3983 (WAG); 50 km on the Harar-Ji- jiga road, 9"12'N, 42"27'E, 24 April 1970, J . De Wilde 6474 (WAG), 2 October 1970, J. De Wilde 7188 (WAG); near Harar, 12 March 1976, Jansen 5242 (WAG).

40 Nord. I. Bor. l (1) 1981

Tab. 1. Comparison between Rhynchosia malacotricha and R. sublobata.

Characters R. malarotricha R. sublobara

Habit

Pubescence of stems, leaves and inflorescences Inflorescences Length of lower calyx lobe Size of seed

very robust, k erect, often with climbing branches densely velvety

fairly dense, often branched 7-10 m m

x 3.8-4 mm 6-6.4 X 4.4-4.8

R. verdcourtii Thulin sp. nov. Fig, 2 Orig. coll.: Ethiopia, Gamu-Gofa Region, Arba Minch, ca. 6"03'N, 37"36'E, 2 September 1975, Gilbert, Thulin and Aweke 376 (UPS holotype, ETH, K, MO isotypes).

R. sp. C : Verdcourt 1971: 754.

Species nova a R. ~ a i a c ~ p h y ~ i a (Spreng.) Boj. in- dumento pilis brevibus, punctis glandulosis et pilis lon- gis base glandulosa, stipulis ovato-cuspidatis, foliolis magis rotundatis et vexillo semper purpureo-venoso differt.

slender to robust, prostrate or climbing t pubescent, rarely velvety lax, unbranched up to 6 m m

3.5-3.8(-4.8) X 2-3.2 m m

4.3-5(-6.4) X

Perennial, climbing or trailing, sometimes f woody herb with up to at least 2 m long branches from a woody rootstock. Stems angular or ridged, pubescent and with longer usually glandular-based hairs up to ca. 1 mm long. Leaflets 3 , the terminal oblate to rhomboid, the laterals obliquely ovate, 8-30 X 8-35 mm, rounded or slightly ernarginate to shortly acute at the apex, truncate to broadly cuneate at the base, shortly pubescent on both surfaces and also with longer usually glandular- based hairs, gland-dotted beneath; petiole up to 4 cm long; rhachis up to 1 cm long; petiolules 1-1.5 mm long;

Fig. 2. Rhynchosia verdcourtii. - A: Habit. - B: Calyx. - C: Detail of pubescence on pedicel. - D: Standard. - E: Wing. - F: Keel. - G: Ovary. - H: Young pod. A-G from Gilbert, Thulin and Aweke 376; H from Mooney 9029.

Nord. J . Bot l ( 1 ) 1981 41

stipels ca. 1 mm long; stipules f ovate-cuspidate, 3.5-7 x (1.5-)2-2.5 mm, several-veined, pubescent. Inflores- cences axillary; rhachis 5-18 cm long; peduncle up to 6 cm long; pedicels 1-3 mm long; bracts ovate or lanceo- late, ca. 3 x 1-2 mm, pubescent, caducous. Calyx shortly pubescent and with longer glandular-based hairs and gland-dots; tube 2.5-3.2 mm long; lobes lanceo- late, 4-7 mm long, the lowest the longest, the upper pair joined for f 2/3 of their length. Standard yellow with purplish veins, elliptic-obovate, 13-16 X 8-1 1.5 mm, auriculate, with 2 wart-like appendages on the inside near the base, pubescent and often also gland-dotted outside; claw ca. 2.5 mm long. Wings yellow, slightly shorter than the keel; blade oblong-oblanceolate, dis- tinctly auriculate and with a pocket on the outside near the base; claw ca. 3 mm long. Keel yellow; blades oblong, with a pocket on the outside near the base; claw ca. 3 mm long. Anthers ca. 0.8 mm long. Ovary fusi- form, ca. 4 mm long, pilose; style 11-13 mm long, pubescent at the base, slightly thickened, upcurved and glabrous towards the apex. Pod brown or blackish, ob- long-falcate, ca. 12-18 X 4-5.5 mm, narrowed at the base, with long glandular-based hairs, short hairs and gland-dots. Seeds greyish with dark and light mottling, ca. 4 x 2.5 X 2 mm.

Distribution and habitat. The species is known from some scattered localities in S Ethiopia, N Uganda, Kenya and N Tanzania (Fig. 1 B). It grows in grassland, deciduous bushlwoodland and at the edge of swamps; alt. 800-1450 m.

Taxonomic comments. This species was provisionally treated as R. sp. C by Verdcourt (1971). Complete ma- terial is now available and the species can be described. It is named in honour of Dr Bernard Verdcourt, Kew, whose circumscription of the species is here followed entirely.

R. verdcourtii is closely related to the sympatric R. malacophylla (Spreng.) Boj., which occurs in similar habitats, but is much more common and also extends to Sudan, Somalia and Yemen. The most conspicuous characteristic of R. verdcourtii is its distinctive in- dumentum with short hairs and gland-dots mixed with long glandular-based hairs on stems, leaves, inflores- cence-rhachides, calyces and pods. In addition the stipules and bracts are broader with more numerous and distinct veins. The leaflets are also more rounded com- pared to the usually acuminate ones of R. malacophylla, although rounded leaflets are occasionally found in the latter species as well (see Verdcourt 1971:754). Finally the colour of the flowers tends to differ in that R. malacophylla usually has a plain yellow standard, while in R. verdcourtii it is probably always purplish veined.

The populations of R. malacophylla with a purplish vei- ned standard mainly occur in areas where R. verdcourtii is not met with. At the type locality of R. verdcourtii both species were growing together without intergrada- tion and no clearly intermediate material has been seen. The most problematic specimens are from the Marsabit area in Kenya (e.g. van Swinderen M 56, K). They have rounded leaflets and denser and longer pubescence on vegetative parts and pods than is normal in the species. Nevertheless, the indumentum does not agree with that of R. verdcourtii, the stipules and bracts are very narrow and the standard is plain yellow. Thus I regard this population merely as an extreme form of R. malacophylla.

Collections besides the type. Ethiopia. Shoa Region, Ghibie Valley, 29 June 1962, Mooney 9029 (FT, K, S), 19 June 1971, Ash 996 (K). - Uganda. Karamoja Distr., Lochoi, 24 May 1940, Thomas 3537 (K); Madang Hill, 30 June 1954, Wilson 92 (K). - Kenya. Meru Distr., Hughwango South swamp, 15 April 1972, Ament and Magogo 2 (K). MerdIsiolo Distr., Isiolc+Wajir road, 59 km from the turning near Isiolo, ca. 0"34'N, 38"05'E, 26 April 1978, Gilbert and Thulin 1061 (EA, K, MO, UPS, WAG). Masai Distr., Chyulu foothills, 17 May 1938, Bally 631 (K). - Tanzania. Moshi Distr., between New Moshi and Old Moshi, 1 July 1926, Peter 42172 (K); Moshi, 26 March 1914, Peter 49843 (K), May 1927, Haarer 387 (K), Lentenegger 1 (K); Lake Chala, 21 January 1936, Greenway 4466 (K). Mpwapwa Distr., Kongwa, Research Station, in experimental garden (probably introduced), 25 October 1968, Prins-Lampert 117 (WAG). -Without precise locality, July 1930, Doughty 32 (K).

Acknowfedgemenrs - I am indebted to the Directors and Curators of the Herbaria in C, IT, K and WAG for working facilities and loan of material. Financial support for the study has been given by the Swedish Natural Science Research Council.

References Baker, E. G. 1929. The Leguminosae of tropical Africa 2. -

Ostend. Chiovenda, E. 1903. Papilionaceae. - In: Pirotta, R., Flora

della Colonia Eritrea. -Ann. R. 1st. Bot. Roma 8: 80-102. - 1908. Papilionaceae. - In: Pirotta, R., Flora della Colonia

Eritrea. - Ann. R. 1st. Bot. Roma 8: 396-444. Christensen, C. 1922. Index to Pehr Forskll: Flora Aegyp-

tiaco-Arabica 1775. - Dansk Bot. Arkiv 4 (3). Cufodontis, G. 1955. Enumeratio plantarum ,Aethiopiae

Spermatophyta (sequentia). - Bull. Jard. Bot. Etat. 25 (2) ,

Forskll, P. 1775. Flora Aegyptiaco-Arabica. - Hauniae. Harms, H. 1907. Leguminosae africanae. IV. - Bot. Jahrb.

Syst. 40: 15-44. Schweinfurth, G . 1896. Sammlung arabish-athiopischer Pflan-

zen (aus den Jahren 1881-1892). - Bull. Herb. Boiss. 4, App. 11.

Verdcourt, B. 1971. Rhynchosia. - In: Milne-Redhead, E. and Polhill, R. M. (eds.), Flora of Tropical East Africa. - Crown Agents for Oversea Governments and Administra- tions. London.

Suppl.

42 Nard. J . Bat l ( 1 ) 1981