NORTH AMERICAN FLORA 



[Volume 24 



1. Bembicidium cubense Rydb.; Britton, Mem. Torrey 

 Club 16: 68. 1920. 



A shrub, 5-6 dm. high; branches ferruginous-pubescent, almost velutinous when young; 

 stipules lanceolate, 2 mm. long; leaves 1-2 cm. long, spreading; petiole and rachis broadly 

 winged, the apical free tip minute; leaflets 2-6, oblong or elliptic or obovate, rounded at the 

 apex, rounded or obtuse at the base, dark -green above, brownish beneath, glabrous on both 

 sides, revolute-margined, 5-8 mm. long; flowers solitary on short axillary branches; pedicels 

 about 1 cm. long, brown; calyx 5 mm. high and broad, glabrous, red-purple; corolla red- 

 purple; petals subequal in length; banner obovate, 12-13 mm. long, 8 mm. wide; blades of the 

 wing- and keel-petals 10-11 mm. long, 4.5 mm. broad, the claws nearly 2 mm. long. 



Type locality: Mountain woods, vicinity of Baracoa, Oriente, Cuba. 



Distribution: Cuba. 



Illustration: Am. Jour. Bot. 11: pi. 33 Q. 



Subtribe 8. ROBINIANAE. Trees or shrubs, or rarely herbs suffrutes- 

 cent only at the base. Leaves usually odd-pinnate with petioluled leaflets 

 and often with small stipels, or the rachis with more or less distinct nodes. 

 Flowers in axillary racemes, usually with caducous bracts, without bractlets. 

 Calyx mostly with a campanulate tube and 5-lobed. Corolla usually with 

 petals subequal in length, except in Sauvallella and Poitea. Stamens dia- 

 delphous or monadelphous; anthers subequal, not appendaged. Ovary many- 

 ovuled, stipitate or sessile; style inflexed or incurved; stigma terminal, minute. 

 Pod linear, flat, 2-valved, several-seeded. Seeds without a strophiole, usually 

 compressed. 



Style more or less hairy. 



Style, at least the upper part, hairy all around; stipular spines often 

 present. 

 Pod flat, wing-margined or ridged on the seed-bearing suture, 



banner without callosities; plant not canescent. 

 Pod turgid, neither wing-margined nor ridged; banner with two 

 callosities; plant canescent. 

 Style hairy on the upper side only; spines absent. 

 Style long-hairy, bent, but not spirally incurved. 



Pod not strongly impressed between the orbicular seeds. 

 Pod strongly impressed between the seeds, which are rectangular 

 in outline. 

 Seeds not constricted at the middle; flowers racemose. 

 Seeds constricted at the middle; flowers solitary or rarely two in 

 the axils; leaves unifoliate. 

 Style short-hairy, spirally incurved. 

 Style glabrous. 



Stamens more or less monadelphous, the upper filament free at the 

 base, united with the sheath at least at the middle. 

 Calyx-iobes 5, short, distinct; stipels absent. 



Calyx-lobes apparently 4, *. e., the upper two united to or nearly 

 to the apex; stipels present, filiform. 

 Stamens diadelphous. 



Keel-petals united up to the apex, more or less arcuate; staminal 

 sheath not dilated at the apex. 

 Stigma pubescent: pod with woody-corky masses between the 



seeds. 

 Stigma not pubescent; pod not corky between the seeds. 

 Plants woody. 



Petals subequal; keel-petals obtuse. 



Petals very unequal, the banner the shortest, the keel- 

 petals the longest, acute. 

 Plants herbaceous (see Homalobus, Kenlrophyla, etc., in the 

 subtribe Astragalanae). 

 Keel-petals narrow, straight, free at the tip; banner shorter than the 

 keel-petals; staminal sheath fan-shaped -dilated at the apex. 



IS. ROBINIA. 



19. Olneya. 



20. Coursetia. 



2S. Benthamantha. 



29. Sphinctospermum. 



21. Lennea. 



22. Willardia. 



23. Hesperothamnus. 



24. Hebestigma. 



25. Gliricidia. 



26. Sauvallella. 



