Genus 4. 



.MIMOSA FAMILY. 



333 



I. Prosopis glandulosa Torr. Prairie Mesquite. 



p. glandulosa Torr. Ann. Lye. X. V. 2 : igj. pi. J. 1S2S. 



A glabrous or minutely pubescent shrub, the axils 

 usually with a pair of sharp spines. Leaves petioied, 

 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, i'-2' long, l"-2" wide : spikes or spike- 

 like racemes axillary, often numerous, peduncled, 

 very densely many-flowered, 2-5' long, nearly i' 

 thick; pedicels V'-i" 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 Wind. 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, 4-5-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 00. 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 acideata Willd. 



Leaflets elliptic, strongly veined. 

 Leaflets linear-oblong, scarcely veined. 



1. M. wtchiata, 



2. M. microphylla. 



I. Morongia uncinata f 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 J"-i" long: 

 stem grooved and angled ; leaves petioied ; pinnae 

 4-8 pairs, distant; leaflets 8-15 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 glbbose, very dense, 

 8"-T2" 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. 



