616 PABACEAE 



lets 15-33, the blades narrowly oWong' tf^ oval, 4-12 s^wr.- hrig:^ obtuse or ncTdcjfied at* tbe> 

 apex, short-stalked: peduncles abof*ti as fe'-ng as the sub*tending l«aves : racemes'SHbglobose 

 to oblong : calyx very thin ; lobes n^n'owly lanceolate, jiioi'ter than the ol)long;-^>anipanu- 

 late tube :_ corolla 1.5-2 cm. long : pwfe fleshy, 3-3.5 ciij.. long, Joog-beaked, prominently 

 ridged-reticulated, pubescent. [Astragcin.-r Tenncsseensis A.- Gray,} 

 On hillsides, Missouri to Tennessee and A'iaAmnn, Spring. 



2. Geoprumnon Platt6nse (Nutt. > Rydb. Plant "villoas- or villous-strigiilose. 

 Stems more or less diffusely branched at tJve- ba.se, the brarJslles- 1-4 dm- long, bec-jming- 

 woody : leaves 4-10 cm. long ; leaflets ]3-2.\ ahe blades oblosng; tb eHiiptic or cuneate,.5-15 

 mm. long, acute or rounded at the apex, shortH*talked : j^ediaicles shorter tlian the sub- 

 tending leaves : racemes few-flowered : calyx ttsiubranous ; lo^Jes- nraarlv »nbulate, shatter- 

 than the oblong tube : corolla about 1.5 cm. low^.: pods fleshy, ovoiSflo" snbglobose, l'li5' 

 cm. in diameter, sharply pointed, villous. [Ast^^mgydm FlaUensi^-^uU.J 



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



3. Geopriunnon pachycdrpum (T. & G. ) Kydb. Plant osarily ^abrotis or thiidy> 

 pubescent. Stems more or less spreading, 1-2 dm. Wg, somewhat bran«feed above : leaves- 

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

 times mucronulate, short-stalked : peduncles shorter than the accompanjihag leaves : calvx 

 appressed-pubescent : corolla not seen : pods oblom^-ovoid, 2-2.8 cm). J®n.g-, flattened ouj 



^the back, acuminate, but glabrous. [Astragalus pachymrpm T. & G.^' 

 On prairies, Arkansas and the Indian Territory. Summer. 



4. Geoprumnon Mexicanum (A. DC.) EydT[>. Plant villotis^stufgillos*. Stems- 

 branched at the base, the branches stout, spreading,, or decumbent, ratill«Mr- f^esJiy : leaves 

 5-10 cm. long; leaflets 17-33, the blades ovate to ova-te-lanceolate, i-©vmd«ttdi or notched at 

 the apex, short-stalked : peduncles commonly surpassing the subtentJing. fef-Iike bracts : 

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

 much shorter than the oblong tube: corolla cream-cclor, bluish at tJi;e- tip, fully 1.5 cm. 

 long : pods fleshy, subglobose, 2.5-3 cm. in diameter, glabrous, obtuse, s<3salSe in ibe calyx. 

 \_Astragalus Mexicanus A. DC] 



On prairies, Illinois to Nelwaska, Arkansas and Texas. £-J)ring. 



5. Geoprumnon crassicdrpum (Nutt.) Rydb. Plant strigillosei Stems more or 

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

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

 mm. long, acute or obtuse, rai'ely notched at the ai^ex, short-stalked :: peduncles shorter 

 than the subtending leaves or longer : racemes few-tilowered : calyx miembranous ; lobes 

 lanceolate to subulate-lanceolate, much shorter than thje tube: corolla viwlet-purple, 1.5-2' 

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

 crassicarpus Nutt. ] 



On prairies, Northwest Territory to Minnesota, Texas and" Colorado. SpringL 



21. ASTRAGALUS L. 



Perennial or annual herbs, various in habit. Leaves alternate,, glie stipules varioi^aj ;: 



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



racemes. Calyx campanulate to tubular : lobes more or less uneqxia;!. Corolla variaiitjly 



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



wings about as long as the keel-petals. Stamens 10 : filaments diadieiphous : anthers alike. 



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



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



Pods copiously pubescent with spreading hairs. 1. A. Wri^Mii. 

 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. Bi-c^-zgeMSis. 



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



Corolla over 1 cm. long : pods 12-18 mm. long. -1. .1. Cwolhiianus, 



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

 or branched at the base, the branches decumbent, 0.5-3 dm. long, conuiioiily 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. 



