134 LEGUMINOS-iE. (PULSE FAMILY.) 



19. BOB INI A, L. LOCUST-TREE. 



Calyx short, 5-toothed, slightly 2-lipped. Standard large and rounded, 

 turned back, scarcely lunger than the wings and keel. Stamens diadelphous. 

 I'od linear, flat, several-seeded, margined on the seed-hearing edge, at length 

 2-valved. Trees or shrubs, often with prickly spines for stipules. Leaves 

 odd-pinnate, the ovate or oblong leaflets stipellate. Flowers showy, iu hanging 

 axillary racemes. Base of the leaf-stalks covering the buds of the next year. 

 (Named in honor of Jofm Robin, horhalist to Henry IV. of France, and his son 

 Vespasian Rohm, who first cultivated the Locust-tree in Europe.) 



1. B. Pseudacacia, L. (COMMON LOCUST or FALSE ACACIA.) Branches 

 naked ; ran /m > sA ml, r, !<i<>s< , flowers white, fragrant ; pod smooth. S. Perm, 

 to Ind., Iowa, and southward. Commonly cultivated as an ornamental tree, 

 and for its valuable timber; naturalized in many places. June. 



2. B. viscbsa, Vent. (('I.AMMY L.) Branchlets and leaf-stalks clammy ; 

 flowers cro>rtl(d in <>/,!<, n>/ rm; // s, tinged with rose-color, nearly inodorous; 

 pod glandular-hispid. Va. to X. ('. and Ga., in the mountains. Cultivated, 

 like the last, ami often escaped. June. 



3. R. hispida, L. (Biusn.v L. or ROSE ACACIA.) Shrub 3 - 8 high ; 

 briuirltlfin itntl stalk* lifis//i/ ; flowers large and deep rose-color, inodorous; 

 pods glandular-hispid. Varies with less bristly or nearly naked branchlets; 

 also with smaller flowers, etc. Mts. of Va. to N. C. and Ga. Mav, June. 



20. WISTABIA, Nutt. 



Calyx campanulate, somewhat 2-lipped ; upper lip of 2 short teeth, the lower 

 of 3 longer ones. Standard roundish, large, turned back, with 2 callosities at 

 its base; keel scythe-shaped ; wings doubly auricled at the base. Stamens di- 

 adelphous. Pods elongated, thickish, knobby, slipitatc, many-seeded, at length 

 2-valved. Seeds large. Woody twiners, climbing high, with minute stipules, 

 pinnate leaves of 9 - 13 ovate-lanceolate leaflets, wit b or wit bout minute stipels, 

 and dense racemes of large and showy lilac-purple flowers. (Dedicated to the 

 late /Vo/;.ss,,/- \\'t'xt<n-, of Philadelphia.) 



1. "W. frutescens, Poir. Downy or smoothish when old; wings of the 

 corolla with one short auricle and an awl-shaped one as long as the cla\v. 

 Alluvial grounds, Va. to Fla., west to S. Ind., Kan. and La. May. Some- 

 times cultivated for ornament, as is the still handsomer Chinese species. 



21. ASTRAGALUS, Tourn. MILK- VETCH. 



Calyx 5-toothed. Corolla usually long and narrow ; standard narrow, equal- 

 ling or exceeding the wings and blunt keel, its sides reflexed or spreading. 

 Stamens diadelphous. Pod several - many-seeded, various, mostly turgid, one 

 or both sutures usually projecting into the cell, either slightly or so as to 

 divide the cavity lengthwise into two. Chiefly herbs (ours perennials), with 

 odd-pinnate leaves and spiked or racemed flowers. Mature pods are usually 

 necessary for certain identification of the species. (The ancient Greek name 

 of a leguminous plant, as also of the ankle-bone ; but the connection between 

 the two is past all guess.) 



