Mackinder, B. et al. (2001) Papilionoideae Flora Zambesiaca 3(5)
Climbing or prostrate, rarely erect, herbs or subshrubs. Stipules present. Leaves 1-or 3-foliolate; leaflets usually with conspicuous resinous gland-dots beneath. Flowers spreading. Calyx 5-lobed, lobes unequal, the upper pair ± joined. Corolla frequently yellow, lined with brownish-purple. Ovary (1-)2-ovulate. Pods 3-4 × as long as broad, almost circular to narrowly oblong, flattened, often falcate, frequently glandular and velvety. Seeds flattened-spherical or subreniform; funicle inserted at middle of the circular hilum. Derivation of name: Gk. rhynchos, a beak, snout or horn, referring to the keel of the flowers Worldwide: c. 300 species, tropics Rwanda: 16 taxa. Insects associated with this genus:
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| Species | Content | |
| alluaudii Sacleux | ||
| densiflora (B.Heyne ex Roth) DC. subsp. stuhlmannii (Harms) Verdc. | ||
| ferruginea A.Rich. | ||
| goetzei Harms | ||
| hirta (Andrews) Meikle & Verdc. | Description, Image | |
| kilimandscharica Volkens ex Harms | ||
| luteola (Hiern) K. Schum. var. luteola | ||
| luteola (Hiern) K. Schum. var. velutina Verdc. | ||
| micrantha Harms | ||
| minima (L.) DC. var. prostrata (Harv.) Meikle | ||
| nyasica Baker | Description, Image | |
| orthobotrya Harms | ||
| procurrens (Hiern) K.Schum. subsp. latisepala (Hauman) Verdc. | ||
| resinosa (Hochst. ex A. Rich.) Baker | Description, Image | |
| sublobata (Schumach. & Thonn.) Meikle | Description, Image | |
| usambarensis Taub. subsp. usambarensis |