194 MIMOSACEAE. 



i. ACUAN Medic. PRAIRIE MIMOSA. 



i. Acuan illinoensis (Michx.) Kuntze. (Desmanthus brachylobus Benth.) 

 In rich bottom lands from Ind. and S. D. to Fla., Tex. and Colo. Sterling. 



2. MORONGIA Britton. SENSITIVE-BRIER. 



i. Morongia uncinata (Willd.) Britton. (Schrankia uncinata Willd.) On 

 prairies from 111. and S. D. to Fla. and Tex. Exact locality not given. 



FAMILY 70. CASSIACEAE Link. SENNA FAMILY. 



Leaves simply pinnate ; corolla very irregular ; one of the lateral petals (standard) 

 and the lowest petal larger than the rest. i. CHAMAECRISTA. 



Leaves twice pinnate ; corolla regularly zygomorph, the upper petal only differing 

 materially from the rest. 2. HOFFMANSEGGIA. 



i. CHAMAECRISTA Moench. 



i. Chamaecrista fasciculata (Michx.) Greene. (Cassia fasciculata Michx.; 

 C. Chamaecrista Walt.; not L.) In prairies from Me. and S. D. to Fla., Tex. 

 and Colo. Denver. 



2. HOFFMANSEGGIA Cav. 



Leaves, flowers and pods with black glandular dots ; pods short, 2-2.5 cm. long, 



straight on the back or nearly so. i. H. Jamesii. 



Dark glandular dots none ; pods 3-4 cm. long, strongly arcuate. 



2. H. drepanocarpa. 



1. Hoffmanseggia Jamesii Torr. In dry soil from Colo, to Tex. and Ariz. 

 Alt. 4000-7000 ft. Rocky Ford; Colorado City; Arkansas River; Wray. 



2. Hoffmanseggia drepanocarpa A. Gray. In dry soil from Colo to Tex. 

 and Ariz. Canon City. 



Family 71. FABACEAE Reichenb. PEA FAMILY. 



Filaments distinct. 



Leaves pinnate. Tribe I. SOPHOREAE. 



Leaves digitately 3-foliate. Tribe II. PODALYRIEAE. 



Filaments monadelphous or diadelphous. 



Rachis of the leaves not produced into a tendril or bristle-like appendage, repre- 

 senting the terminal leaflet. 

 Fruit 2-valved or indehiscent, not a loment. 

 Foliage not glandular-dotted. 



Anthers of 2 kinds ; filaments monadelphous ; leaves digitate ; calyx 2- 



lipped. Tribe III. GENISTEAE. 



Anthers all alike ; filaments diadelphous ; calyx s-toothed. 



Leaflets toothed. Tribe IV. TRIFOLIEAE. 



Leaflets not toothed. 



Leaves irregularly pinnate ; leaflets even in number, 4 or 6 ; stip- 

 ules gland-like ; flowers umbellate. Tribe V. LOTEAE. 

 Leaves odd-pinnate ; stipules not gland-like ; flowers racemose or 



capitate. Tribe VI. GALEGEAE. 



Foliage glandular-dotted. 



Pod prickly. Tribe VII. GLYCYRRHIZEAE. 



Pod not prickly, indehiscent. Tribe VIII. PSORALEAE. 



