616 FAB ACE AE 



lets 15-33, the blades narrowly oblong to oval, 4-12 mm. long, obtuse or notched at the 

 apex, short-stalked : peduncles about as long as the subtending leaves : racemes subglobose 

 to oblong : calyx very thin ; lobes narrowly lanceolate, shorter than the oblong-campanu- 

 late tube : corolla 1.5-2 cm. long : pods fleshy, 3-3.5 cm. long, long-beaked, prominently 

 ridged -reticulated, pubescent. [Astragalus Tennesseensis A. Gray.] 

 On hillsides, Missouri to Tennessee and Alabama. Spring. 



2. Geoprumnon FlattSnse (Nutt. ) Rydb. Plant villous or villous-strigillose. 

 Stems more or less diffusely branched at the base, the branches 1-4 dm. long, becoming 

 woody : leaves 4-10 cm. long ; leaflets 1 3-23, the blades oblong to elliptic or cuneate, 5-15 

 mm. long, acute or rounded at the apex, short-stalked : peduncles shorter than the sub- 

 tending leaves : racemes few-flowered : calyx membranous ; lobes nearly subulate, shorter 

 than the oblong tube : corolla about 1.5 cm. long : pods fleshy, ovoid to subglobose, 1-1.5 

 cm. in diameter, sharply pointed, villous. [Astragalus Plattenm Nutt.] 



In dry soil, on prairies, Minnesota to Indiana, Alabama and Texas. Spring. 



3. Geoprumnon pachycarpum (T. & G. ) Rydb. Plant nearly glabrous or thinly 

 pubescent. Stems more or less spreading, 1-2 dm. long, somewhat branched above : leaves 

 5-8 cm. long ; leaflets 17-31, the blades oblong to cuneate, 5-14 mm. long, obtuse, some- 

 times mucronulate, short-stalked : peduncles shorter than the accompanying leaves : calyx 

 appressed-pubescent : corolla not seen : pods oblong-ovoid, 2-2.8 cm. long, flattened on 

 the back, acuminate, but glabrous. [Astragalus pachycarpus T. & G.] 



On prairies, Arkansas and the Indian Territory. Summer. 



4. Geoprumnon Mexicanum (A. DC.) Rydb. Plant villous-strigillose. Stems 

 branched at the base, the branches stout, spreading, or decumbent, rather fleshy : leaves 

 5-10 cm. long ; leaflets 17-33, the blades ovate to ovate-lanceolate, rounded or notched at 

 the apex, short-stalked : peduncles commonly surpassing the subtending leaf-like bracts : 

 racemes 2-8 cm. long : calyx densely pubescent ; lobes triangular to triangular-lanceolate, 

 much shorter than the oblong tube: corolla cream-color, bluish at the tip, fully 1.5 cm. 

 long : pods fleshy, subglobose, 2.5-3 cm. in diameter, glabrous, obtuse, sessile in the calyx. 

 [Astragalus Mexicanus A. DC.] 



On prairies, Illinois to Nebraska, Arkansas and Texas. Spring. 



5. Geoprumnon crassicarpum (Nutt.) Rydb. Plant strigillose. Stems more or 

 less diffusely branched at the base, the branches spreading or prostrate, 1-4 dm. long : 

 leaves 3-10 cm. long ; leaflets 13-27, the blades elliptic, oblong or oblong-lanceolate, 8-20 

 mm. long, acute or obtuse, rarely notched at the apex, short-stalked : peduncles shorter 

 than the subtending leaves or longer : racemes few-flowered : calyx membranous ; lobes 

 lanceolate to subulate-lanceolate, much shorter than the tube : corolla violet-purple, 1.5-2 

 cm. long: pods subglobose or oval, fleshy, 2-2.5 cm. thick, short-pointed. [Astragalus 

 crasdcarpus Nutt.] 



On prairies, Northwest Territory to Minnesota, Texas and Colorado. Spring. 



21. ASTRAGALUS L. 



Perennial or annual herbs, various in habit. Leaves alternate, the stipules various : 

 leaflets many or several, the blades entire, sometimes notched. Flowers perfect, in 

 racemes. Calyx campanulate to tubular : lobes more or less unequal. Corolla variously 

 colored : standard with a broad erect blade, often much longer than the other petals : 

 wings about as long as Jhe keel-petals. Stamens 10 : filaments diadelphous : anthers alike. 

 Ovary sessile. Ovules few or numerous. Pod ovoid to oblong, sometimes nearly didy- 



j leathery or woody, perfectly 2-celled, dehiscent. Seeds few or many. 



Pods copiously pubescent with spreading hairs. 1. A. Wright it. 

 Pods glabrous or essentially so. 



Corolla less than 1 cm. long : pods 4-8 mm. long. 



Pods stipitate, about as broad as long. 2. A. Brazoensis. 



Pods sessile, much longer than broad. 3. A. rejtexus. 



Corolla over 1 cm. long : pods 12-18 mm. long. 4. A. Carolinianus. 



1. Astragalus Wrightii A. Gray. Plant villous-strigillose. Stems simple and erect 

 or branched at the base, the branches decumbent, 0.5-3 dm. long, commonly simple : 

 leaves relatively few, often approximate ; leaflets 7-11, the blades oblong or narrowly 

 elliptic, 5-15 mm. long, acute or acutish, short-stalked : peduncles surpassing the subtend- 

 ing leaves : racemes capitate : calyx densely villous ; lobes linear-subulate, somewhat 

 longer than the tube : corolla white to violet, 6-10 mm. long : pods leathery, oblong, about 

 1 cm. long, pubescent, straight, capitate. 



In dry soil, Texas. Spring. 



