1954] 



PLANTS COLLECTED IN NYASALAND 



413 



Key to Plants lacking Pods 



Lower paired stipels on each leaf 4—8 mm. long, often, but not always, twice 

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

 long when expanded. 

 Leaflets all obovate, rounded at apex, with an apical mucro usually 1-3 



mm. long but sometimes less. 5. D. rupestris. 



Leaflets mostly elliptic to lanceolate, obtusely pointed or rarely subacute 

 at apex, with an apical mucro 0.5-1 mm. long, rather strongly tri- 

 nerved at base; leaflets conspicuously margined with short white pu- 

 bescence (if not so then compare no. 7). 6. D. taubertii. 

 Lower paired stipels on each leaf 1— 3(-4) mm. long, not as much as twice 

 as long as the lateral petiolules, filiform. 

 Flowers small, about 6—11 mm. long when expanded. 



Calyx-teeth 1-2 mm. long; plant green and glabrescent; tertiary vena- 

 tion on lower side of leaflets raised. 4. D. sp. 

 Calyx-teeth 3 mm. long or more, rarely only 2 mm. and then plant 

 densely pubescent without raised tertiary venation on lower side 

 of leaves. 



Upper and lateral calyx-teeth quickly attenuate into long filiform 

 points 4—6 mm. long and two to several times as long as the ex- 

 panded basal part of the teeth. 

 Leaflets puberulous above with short hairs, narrow, oblong to lan- 

 ceolate, tending to be parallel-sided. 10. D. stenophyllus . 

 Leaflets with numerous much longer hairs above, mostly ovate to 

 elliptic. 



Calyx-teeth conspicuously long-filiform; native plant. 3. D. daltoni. 



Calyx-teeth less attenuate; introduced only. 2a. D. uniflorus var. uniflorus. 

 Calyx-teeth acute or acuminate, not or only shortly filiform-pointed, 

 acumen up to 2-4 mm. long and up to 1/4 times as long as the 

 broadened basal part of the teeth. 

 Leaflets mostly narrow, oblong to lanceolate, tending to be par- 

 allel-sided, hairs on upper surface short. 10. D. stenophyllus . 

 Leaflets mostly broad, ovate to obovate or broadly elliptic, not in 

 the least parallel-sided, hairs on upper surface mostly longer 

 than last. 2a & 2b. D. uniflorus var. uniflorus. (introduced in 



Africa) and var. stenocarpus (native); the vars. 

 not safely distinguishable without fruits. 



Flowers medium to large, 12-24 mm. long. 



Plants climbing or twining; stems becoming thinly woody; leaflets 

 mostly ovate, narrowed to a blunt or obtuse apex, variable in size, 

 mostly less than 4 cm. long, venation beneath not raised. 

 Upper and lateral calyx-teeth quickly attenuate into long filiform 

 points 4—6 mm. long and 2-several times as long as the ex- 

 panded basal part of the teeth. 3. D. daltoni. 

 Calyx-teeth acute or acuminate, not or only shortly filiform-pointed, 

 acumen 2-4 mm. long and up to IV2 times as long as the ex- 

 panded basal part of the teeth. 

 Stems with usually sparse sometimes dense appressed pubescence 

 [intermediates occur between this and la, var. axillaris]; 

 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. 

 Plants prostrate or rarely climbing, usually herbaceous; leaflets with 

 venation raised beneath and very commonly rounded at apex. 

 Petioles short, 0.5-1.5(-2.3) cm.; leaflets small, 1-4 cm. long, vari- 

 able in shape, usually rounded at apex; flowering shoots pros- 

 trate or twining; calyx 5—9 mm. long, teeth narrowly triangular to 

 subulate, 3-7 mm. long. 8. D. chrysanthus. 



