LEGUMINOSJE. (PULSE FAMILY.) 149 



1 - many-seeded. Seeds flat. Thorny trees, with abruptly once or twice pin- 

 nate leaves, and inconspicuous greenish flowers in small spikes. Thorns above 

 the axils. (Named in honor of J. G. Gleditsch, a botanist contemporary wit!? 

 Linnaeus.) 



1. G. triacanthos, L. (TIIREE-THORXED ACACIA, or HONEY-LOCCST.) 

 Thorns stout, often triple or compound; leaflets lanceolate-oblong, somewhat 

 serrate; pods linear, elongated (1-1 long), often twisted, filled with sweet 

 pulp between the seeds. Rich woods, western N. Y. and Penn. to Ga., west 

 to Mich., E. Neb., Kan., and La. A large tree, common in cultivation, with 

 very hard and heavy wood. 



2. G. aquatica, Marsh. (WATER-LOCUST.) Thorns slender, mostly 

 simple; leaflets ovate or oblong ; pods oval, ]-seeded, pulpless. (G. monosper- 

 ma, Walt.) Deep swamps, Mo. to S. Ind., S. Car., and southward. A smaller 

 tree, 30 -40 high. 



45. DESMANTHTJS, Wffld. 



Flowers perfect or polygamous, regular. Calyx campanulate, 5-toothed. 

 Petals 5, distinct. Stamens 5 or 10. Pod flat, membranaceous or somewhat 

 coriaceous, several-seeded, 2-valved, smooth. Herbs, with twice-pinnate leaves 

 of numerous small leaflets, and with one or more glands on the petiole, seta- 

 ceous stipules, and axillary peduncles bearing a head of small greenish-white 

 flowers. (Name composed of SeV/xa, a bond, and &i/9os, flower.) 



1. D. brachylobus, Beuth. Nearly glabrous perennial, erect (1-4 

 high) ; pinna? 6-15 pairs ; leaflets 20-30 pairs ; peduncles 1-3' long ; stamens 

 5 ; pods numerous in dense globose heads, oblong or lanceolate, curved, scarcely 

 I' long, 2 - 6-seeded. Prairies and alluvial banks, Ind and Ky. to Minn., Mo., 

 and Tex. ; also in Fla. 



2. D. leptolobus, Torr. & Gray. Pinnae 5-8 pairs; leaflets 10-20 

 pairs ; peduncles 1' long or less ; heads rather loose , stamens 5 ; pods usually 

 few, narrowly linear, erect, 1-2' long. Central Kan. to Tex. 



46. SCHRANKIA, Willd. SENSITIVE BRIAR. 



Flowers polygamous, regular. Calyx minute, 5-toothed. Petals united into 

 a funnel-form 5-cleft corolla. Stamens 10- 12, distinct, or the filaments united 

 at base. Pods long and narrow, rough-prickly, several-seeded, 4-valved, i. e,, 

 the two narrow valves separating on each side from a thickened margin. Pe- 

 rennial herbs, nearly related to the true Sensitive Plants (Mimosa) ; the procum- 

 bent stems and petioles recurved-prickly, with twice-pinnate sensitive leaves of 

 many small leaflets, and axillary peduncles bearing round heads of small rose- 

 colored flowers. (Named for F. P. Schrank, a German botanist.) 



1. S. uncinata, Willd. Prickles hooked; pinnae 4-6 pairs; leaflets ellip- 

 tical, reticulated with strong veins beneath ; pods oblong-linear, nearly terete- 

 short-pointed, densely prickly (2' long). Dry sandy soil, Va. to Fla., west to 

 S. 111., Kan., and Tex. 



2. S. angustata, Torr. & Gray. Leaflets oblong-linear, scarcely veined; 

 pods slender, taper-pointed, sparingly prickly (about 4' long). S. Va. (*) to 

 Fla., Tenn., and Tex. 



