36 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Leaflets oblong. 
Flowers axillary, solitary or in pairs. 
Stems climbing. 
Leaflets green above. 
Leaflets thickish. 
Flowers in small umbels. ..0 20.02.2022 2222-2 eee eee eee eee 7. C. deamii. 
Flowers in pairs. 
Hairs on calyx appressed 2.22... 026 0+ +0022222 2222 -+5- 8. CL scandens. 
Hairs on calyx spreading. ....----------------------- 9, CL rufescens. 
Leaflets thin ..2..22-2.- 20-22-22 eee eee ee eee eee 10. C. glabrior. 
Leaflets pale on both sides. 
Leaflets rounded at apex. 2.2.2 2++000 2250222 e rete eee 11. C. jaliseana. 
Leaflets (Cul 2.2.00 e eee ee eee eee cree eee 12. C. pallida. 
Stems not climbing. 
Leaflets glabrous or nearly so above. 
Petioles slender, sometimes 4 cm. long ....2.---+--++++----+- 13. C. martia. 
Petioles very short or wanting. 
Leaflets reticulate above, and. with close appressed pubescence beneath. 
14. C. pringle:. 
Leaflets not reticulated above, and with somewhat spreading hairs beneath. 
15. C. houghii. 
Leaflets pubescent above, 
Petioles short or wanting. 
Pods short, turgid. ....-.------------0 +222 2222222 - eee 16, C. lemmoni. 
p 7. C. humifusa, 
(18. C. ebovata. 
Petioles elongated ......-222.-+++---222 2-202 e eee 19. C. humilis. 
Flowers racemose ov capitate. 
Pods elongated, nurrow ........--2++-++-++-22222-- +--+ 
Flowers racemose. 
Racemes elongated. 
Leaflets elliptical, strongly reticulated above; bractlets minute... 20. C. nelsoni. 
Leaflets ovate, not strongly reticulated above; bractlets Imear. 
Pubescence on pods and calyx appressed. ...++++++-+-+-- 21. C. racemosa. 
Pubescence on pods and calyus spreading. ...-+++-++++++++-- 29. C. biloba. 
Racemes short. ......000----- 2222 e eee eee eee eee 23. C. grandiflora, 
Flowers capitate. 
Leaves narrow, acute; flowers indny......-2+2---2 22.2 eee eee 24. CL capitata. 
Leares broad and obtuse; flowers few ......----- 2-0-0000 22222 e 25. C. hirta. 
1. Cologania procumbens Kunth, Mimos. 205, pl. 47. 1819. 
Type locality: ‘Prope Popoyan, alt. 912 hex,’’ South America. 
Without seeing the type it is difficult to decide whether the Mexican material is 
to be referred to C. procumbens or not. For the present, at least, it seems better not 
to make any change. The character of reflexed hairs on the stems seems variable 
in the Mexican material, for the writer collected both forms on San Felipe in 1899. 
The flowers are usually in pairs, but the earlier plants sometimes produce umbels of 
3 or 4 flowers. 
Specimens evaneined: 
Guatemala: Station not given, Enrique Th. Heyde, 1892 (nos, 131 and 582); 
from Santa Rosa, H. yon Turckheim 1888 (no. 1419); from Department of 
Guatemala, W. C. Shannon (no. 4705), all in John Donnell Smith's distri- 
butions, in which the last two were sent out as Galactia marginalis, determ. 
Michel. 
Oaxaca. Between Guichocovi and Lagunas, altitude 187 to 289 meters, E. W. 
Nelson, Jane 27, 1896 (no. 2750); San Felipe, J. N. Rose, June, 1899 (no. 
4596). 
