116 LEGUMINOS^. (PULSE FAMILY.) 



M. PUDICA, L., the common SENSITIVE-PLANT, is partially naturalized in 

 sonic localities. 



46. SCHRANKIA, Willd. 



Flowers polygamous. Calyx minute. Corolla funnel-shaped, 5-cleft. Sta- 

 mens 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, with bipinnate sensitive leaves, and purple 

 flowers in globose axillary peduncled heads. 



1. S. uncinata, Willd. Stem, petioles, peduncles, and legumes thickly 

 beset with short and thick recurved prickles ; pinnae 5-6 pairs ; leaflets 26 - 30, 

 elliptical, reticulated with elevated veins beneath; peduncles mostly solitary, 

 usually shorter than the leaves ; legume oblong-linear, with a short acuminate 

 point, about as long as the peduncle ; seeds elliptical. Dry sandy soil, Florida, 

 and westward. June -August. Stem 2 -4 long. Legume 2' long. 



2. S. angustata, Torr. & Gray. Stem, &c. armed with scattered weak 

 recurved prickles ; pinnae 4-6 pairs ; leaflets about 30, linear-elliptical, veinless, 

 or nearly so, on both sides ; peduncles single or by pairs, much shorter than the 

 leaves ; legume narrow-linear, 3-4 times as long as the peduncle, ending in a 

 long subulate smoothish point. 



Var. ? brachycarpa. Stem, c. as in No. 1 ; leaflets oblong-linear ; pedun- 

 cles single or 2 - 4 in a cluster, the upper ones longer than the leaves ; legumes 

 (2' -3' long) broadly linear, abruptly slender-pointed, densely armed with strong 

 often branching prickles, about as long as the peduncle. Dry pine barrens, 

 Florida to North Carolina, and westward. June - August. Stem 2 - 5 long. 

 Legumes 4' -5' long. 



47. PITHECOLOBIUM, Martins. 



Flowers perfect, rarely polygamous. Calyx tubular-campanulate, 4 - 5-toothed. 

 Corolla tubular-funnel-shaped, 4 - 5-cleft. Stamens 10 or more, long exserted, 

 monadelphous near the base. Style filiform. Legume broadly linear, com- 

 pressed, contorted or falcate, transversely partitioned, mealy or pulpy within. 

 Seeds lenticular. Trees or shrubs, often armed with stipular spines. Leaves 

 pinnate or bipinnate. Flowers chiefly capitate, axillary and terminal. 



1. P. Unguis-Cati, Benth. Unarmed or spiny; leaves bipinnate; leaf- 

 lets 4, thin, broadly and obliquely obovate, the partial petioles much shorter than 

 the common one ; heads globose, in a loose raceme ; calyx-teeth short, ciliate ; 

 corolla yellowish, smooth ; stamens crisped, twice as long as the corolla ; ovary 

 smooth. (Inga Unguis-Cati, Willd.) South Florida. Leaflets 1 ' - 1|' long, 

 light green. (Legume spirally twisted, 5 - 6-seeded, white, and fleshy within. 

 McFadyen.) 



2. P. Guadalupense. Unarmed ; leaves bipinnate ; leaflets 4, coria- 

 ceous, obliquely oblong or obovate, the common and partial petioles nearly 

 equal ; peduncles solitary, axillary, longer than the leaves, or the upper ones 

 racemose ; calyx and corolla pubescent ; stamens 30 or more, 3-4 times as long 



