Genus 4. 



MIMOSA FAMILY. 



333 



I. Prosopis glandulosa Torr. Prairie jMesquite. Fig. 2433. 



P. glandulosa Torr. Ann. Lye. N. Y. 2 : 192. pi. 2. 1828. 



A glabrous or minutely pubescent shrub, the axils 

 usually with a pair of sharp spines. Leaves petioled, 

 with 2 spreading short-stalked pinnae, each of 

 numerous sessile leaflets which are linear or linear- 

 oblong, entire, acute or obtuse, mostly mucronulate, 

 firm, veiny, J'-2' long, i"-2" wide ; spikes or spike- 

 like racemes axillary, often numerous, peduncled, 

 very densely many-flowered, 2'-s' long, nearly Y 

 thick; pedicels \"-\" long; calyx campanulate; 

 petals 2-4 times as long as the calyx; ovary villous; 

 pods linear, stipitate, 4'-8' long, 4"-6" wide, con- 

 stricted between the seeds. 



Kansas to Texas, Arizona, California and Mexico. 

 Apparently distinct from the tropical P. juliflora (Sw.) 

 DC. April-June. 



5. MORONGIA Britton, Mem. Torr. Club 5: 191. 1894. 



[ScHRANKiA Willd. Sp. PI. 4: 1041. 1806. Not Medic. 1792.] 

 [Leptoglottis DC. Mem. Leg. 451. 1823?] 

 Perennial herbs, or shrubs, mainly prostrate or procumbent, armed with recurved 

 prickles. Leaves bipinnate, usually sensitive ; leaflets numerous, small ; stipules setaceous. 

 Flowers regular, small, 4-S-parted, pmk or purple, perfect or polygamous, in axillary 

 peduncled heads or spikes. Petals united to the middle. Stamens usually 8-12, distinct or 

 united at the base; anthers all alike. Ovary nearly sessile; ovules =0. Pod linear, acute or 

 acuminate, spiny all over, at length 4-valved, several seeded. [Named in honor of the late 

 Rev. Thos. Morong, a contributor to the first edition of this work,] 



About 10 species, natives of temperate and tropical America, i in tropical Africa. Type species : 

 Schrankia aculeata Willd. 



Leaflets elliptic, strongly veined. 

 Leaflets linear-oblong, scarcely veined. 



1. M. imcinaia. 



2. M. microphylla. 



I, Morongia uncinata (Willd.) Britton. 

 Sensitive-brier. Fig. 2434. 



Schrankia uncinata Willd. Sp. PI, 4: 1043. 1806. 

 M. uncinata Britton, Mem. Torr. Club 5 : 191. 1894. 



Herbaceous, perennial, branched, decumbent, 2°- 

 4° long. Stem, branches, petioles and peduncles 

 thickly armed with hooked prickles i"-i" long; 

 stem grooved and angled; leaves petioled; pinnae 

 4-8 pairs, distant; leaflets 8-iS pairs, obliquely ellip- 

 tic, thick, obtusish and mucronate at the apex, 

 inequillateral and rounded at the base, slightly ciliate 

 on the margins, strongly marked with few elevated 

 veins beneath, 2"-4" long; heads globose, very dense, 

 8"-i2" m diameter; flowers pink; pods terete, very 

 densely spiny, about 2' long. 



In dry soil, Virginia to Illinois and South Dakota, 

 Nebraska, Florida and Texas. May-July. Shame-vine. 

 Sensitive-rose. 



