412 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 5 



Pods broader, 3.5-5 mm. wide, short or long. 



Pods normally distinctly falcate towards apex, their sides pubescent 

 with a mixture of very short and much longer silky hairs, or else 

 glabrous; flowers small, 7—11 mm. long. 

 Calyx-teeth all 1—2 mm. long; tertiary venation on lower side of leaf- 

 lets raised; very slender annual herb, green and glabrescent, 

 with small cream to greenish-yellow flowers 9—11 mm. long. 4. D. sp. 



Lower calyx-tooth 4-^5 mm. long; tertiary venation on lower side of 

 leaflets not raised; a slender climbing herb, ± pubescent or some- 

 times subglabrous; leaflets mostly short, ovate to obovate, ob- 

 tuse or rounded rarely subacute at apex; flowers small, cream to 

 yellow, 7-10(-ll) mm. long. 2b. D. uniflorus var. stenocarpus. 



Pods straight or almost so, glabrous or very shortly pubescent; flowers 

 medium, 12—15 mm. long when expanded. 

 Petioles short, 0.5— 1. 5(-2.3) cm.; leaflets small, 1—4 cm. long, vari- 

 able in shape, usually rounded at apex; prostrate or rarely climb- 

 ing herb; calyx 5—9 mm. long, teeth narrowly triangular to subu- 

 late, 3—7 mm. long; flowers pale yellow or cream; pod 2.2-4 cm. 

 long, 3.5—4.5 mm. wide. 8. D. chrysanthus. 



Petioles long, 3 cm. or more; leaflets larger, mostly 4—6 cm. long, 

 elliptic to oblong; calyx 5—6 mm. long, teeth triangular, 2—4 mm. 

 long [if calyx-teeth elongate 4—6 mm. long with subulate-filiform 

 points, then see 9, D. brevicaulis Bak.J; flowers greenish to 

 cream; pod 6—7 cm. long, 5 mm. wide. - 7. D. oliganthus. 



Pods (5-)6-8.5 mm. wide. 



Lower paired stipels on each leaf 4-8 mm. long, usually twice as long as 

 the lateral petiolules, brown; flowers medium, 12-15 mm. long when 

 expanded. 



Pods short, 2.5—3.5 cm. long, very shortly pointed at base and apex; 

 leaflets mostly obtusely pointed or rarely subacute, with an apical 

 mucro 0.5—1 mm. long, elliptic to lanceolate, rather strongly tri- 

 nerved at base. 6. D. taubertii. 



Pods much longer, 5-6 cm. long, attenuate at base and apex; leaflets 

 all obovate, rounded at apex, with apical mucro 1-3 mm. long hut 

 sometimes less. 5. D. rupestris. 



Lower paired stipels on each leaf l-3(-4) mm. long, not as much as twice 

 as long as the lateral petiolules, filiform. 

 Lower and lateral sepals quickly attenuate into long filiform points two 

 to several times longer than the expanded basal part of the teeth; 

 flowers pale to greenish-yellow. 

 Flowers small, up to 10 mm. long, rarely as much as 12-13 mm.; 

 slender herbs, probably always annual; leaflets ovate; pods 

 slightly but distinctly falcate. 

 Pods (under a lens) densely clothed on sides with very fine non- 

 tubercle-based hairs; only a rare introduction in Africa. 



2a. D. uniflorus var. uniflorus . 

 Pods (under a lens) rather sparsely clothed on sides with stiffer, 

 fragile, setiform, tubercle-based hairs, with an "under-storey" 

 of minute hairs; sepals with longer filiform points than last. 3. D. daltoni. 

 Flowers medium to large, 13—18 mm. long; flowering shoots erect, 

 later producing trailing lateral shoots; leaflets obovate, drying 

 greyish; pods (only immature pods known) about 6 mm. wide. 9. D. brevicaulis. 

 Lower and lateral sepals acuminate, not filiform-pointed, acumen up to 

 1/4 times as long as expanded basal part of teeth; perennials, often 

 with thinly woody stems; flowers medium to large, 12—24 mm. long. 

 Stems with usually sparse sometimes dense appressed pubescence 

 [intermediates occur between this and la, var. axillarisl; flowers 

 13—20 mm. long; fruits usually rather long-beaked, beak about 5- 

 15 mm. long. , lc. D. axillaris var. glaber. 



Stems with dense spreading pubescence; fruits pubescent, usually 

 with short beaks 3— 5(— 7) mm. long. 

 Flowers medium, 12-15 mm. long; calyx 4—7 mm. long. 



la. D. axillaris var. axillaris. 

 Flowers large, 15—24 mm. long; calyx 7—12 mm. long. 



lb. D. axillaris var. macranthus. 



