POLYPETALOUS EXOGENOUS PLANTS. 247 



me7is 4-15, distinct, much exserted; legume compressed, 

 mostly jointed, 1-many-seeded ; the broad valves separat- 

 ing at maturity from the persistent margins. — llerls, 

 shrubs, or trees) leaves bipinnate, sensitive ; jloicers white 

 or rose-color, capitate or spiked, on axillary peduncles. 



M. STRIGILLOSA, Torr. and Gray. Herhaceous, and 

 rough with scattered appressed rigid hairs ; stem prostrate ; 

 leaves long-petioled; jt?m?ifl5, 5-6 pairs ; leaflets 10-14 pairs, 

 oblong-linear; jjeclundes longer than the leaves; heads of 

 floivers elliptical ; legume oval or oblong, 1-3-jointed, his- 

 pid. Flowers rose-rolor. 



SOHRANKIA, Willd. 



Floivers polygamous ; calyx minute ; corolla funnel- 

 formed, 5-cleft ; stamens 8-10, distinct, exserted ; legume 

 not jointed, prickly, 1-celled, many-seeded; the narrow 

 valves separating at maturity from the broad margins. — 

 Perennial prostrate prickly herbs, Avith bipinnate sensitive 

 leaves, and purple flowers in globose, axillary, peduncled 

 heads. 



S. UNCINATA, Willd. Stem, petioles, peduncles, and 

 legumes thickly beset with short and thick recurved 

 prickles ; pinnm 5-6 pairs ; leaflets 26-30, elliptical, reticu- 

 lated Avith elevated veins beneath ; peduncles mostly soli- 

 tary, usually shorter than the leaves ; legume oblong-linear, 

 with a short acuminate point, about as long as the pedun- 

 cle ; seeds elliptical. Stem 2°-4° long; legume %' long. 



DESMANTHUS. 



Floxoers polygamous ; calyx 5-toothed ; corolla of 5 ob# 

 long-spatulate petals, or tubular and 5-cleft ; stamens 5-10 ; 

 filaments of the lower floAvers filiform, sterile; legume 

 linear, continuous 2-valved. — Herbs ov shri(,bs,vf\ih. abruptly 



