Part 2, 1920] 



FABACEAE: PSORALEAE 



71 



Leaflets narrowly oblong, 2-3 mm. long, strongly involute, pu- 

 bescent on both sides. 

 Corolla rose-colored to white. 



Spikes elongate, oblong-cylindric, usually peduncled at the ends of 

 elongate branches. 

 Leaves villous-sericeous; branches villous-canescent. 



Stems conspicuously glandular-tubercled; petals usually 



without glands. 

 Stems not conspicuously glandular; petals with a large gland 

 near the apex. 

 Leaves at least below and stem finely short-pubescent. 



Leaflets sparingly pilose or glabrate above, obtuse; corolla 



rose-colored . 

 Leaflets finely short-pubescent above, acute; corolla nearly 

 white. 

 Spikes short, often subglobose, sessile at the ends of short leafy 

 branches. 

 Plant densely silky-sericeous. 



Leaves pinnate, 5-1 1-foliolate; stems 2 dm. long or more. 



Stem and branches erect or ascending, stout; leaflets 9-1 1. 

 Stem and branches decumbent, slender: leaflets 5-7. 

 Leaves 3-foliolate; a dwarf shrub 1-2 dm. high. 



134. P. Isugoides. 



135. P. megaloslachys. 



136. P. Wislizeni. 



137. P. Sanclae-Crucis. 



138. P. leucanlha. 



139. P. sessilis. 



140. P. leucosericea. 



141. P. Greggii. 



142. P. eriophylla. 



XXXIV. Crassikoliae 

 Leaflets oval, flat. 



Bracts not exceeding the calyx; calyx-lobes shorter than the tube. 143. P. longifolia. 



Bracts much longer than the calyx; calyx-lobes equaling the tube. 144. P. rosei flora. 



Leaflets oblong, thick, channeled; calyx-lobes longer than the tube. 145. P. crassifolia. 



XXXV. Lasiostachyae 

 Calyx-tube densely pubescent. 



Branches not conspicuously glandular-dotted. 



Leaflets broadly oblong; calyx-lobes shorter than the tube. 146. P. Smilhii. 



Leaflets narrowly oblong to linear; calyx-lobes equaling or exceed- 

 ing the tube. 

 Calyx appressed-silky; leaves slightly pubescent when young; 



corolla pale. 147. P. glabrescens. 



Calyx loosely pilose; leaves glabrous from beginning. 



Leaflets linear-oblong, slightly involute; corolla rose-purple. 148. P. lasiostachya. 

 Leaflets linear, strongly involute; corolla pale-rose, pink, or 



whitish. 149. P. involula. 



Branches conspicuously glandular-dotted. 150. P. Brandegei. 



Calyx-tube glabrous or nearly so. 159. P. Botterii. 



XXXVI. Formosae 

 Spikes many-flowered; calyx-lobes about equaling the tube. 151. P. Saffordii. 



Spikes few-flowered; calyx-lobes much longer than the tube. 



Bracts glabrous; calyx-lobes about 6 mm. long. 152. P. formosa. 



Bracts silky-pilose; calyx -lobes 3.5-4 mm. long. 153. P. Purpusi. 



XXXVII. Microphyiaae 

 Calyx-tube more or less pubescent. 



Leaflets 7-11, often emarginate, blackening in drying; corolla in age 

 almost black with lighter edges. 

 Spikes very short, head-like; glands of the calyx inconspicuous. 

 Spikes oblong, 2-5 cm. long; glands of the calyx very conspicuous. 

 Leaflets 11-35, not emarginate, not blackening; corolla in age purplish- 

 brown or rose-brown. 

 Leaflets 1 1-19, usually less than 5 mm. long; corolla less than 1 cm. 



long. 

 Leaflets 13-35, usually more than 5 cm. long; corolla more than 1 

 cm. long. 

 Calyx-tube glabrous, conspicuously glandular-dotted. 



154. P. melanlha. 



155. P. fuscescens. 



156. P. zimapanica. 



157. P. diversicolor. 



158. P. argyrostachya. 



XXXVIII. LeucostomaE 



Calyx-tube wholly glabrous, except the margins. 

 Leaves glabrous. 



Stem glabrous; corolla yellow, at least when young. 

 Stem puberulent; corolla rose-purple. 

 Leaves more or less pubescent. 



Bracts abruptly caudate-acuminate, glabrous. 

 Corolla yellow. 



Stem and leaflets on both sides long-hairy. 

 Stem and lower surface of the leaflets short-hairy, the upper 

 surface of the leaves glabrate. 

 Corolla dark-blue. 



158. P. argvroUachya. 



159. P. Bollerii. 



160. P. gigantea. 



161. P. macroslachya. 



162. P. atrocyanea. 



