ptlA family 501 



1. R. 9C8^>hoideg CM. E. Jones) Rydb. Stem coarse, strigose, 5-7 dm. 

 high; leaflets about 11, elliptic. 1-2.-5 cm. long, gra^Tah-strigoae beneath, glabrous 

 above; csuWx black-hairy, 8 mm. long; teeth 2 mm. long, triangular-subulate; 

 corolla white; pod coriaceous, glabrous, reticulate; stipe about 1 cm., long; body 

 oblong, acute, about 1.5 mm. long. Astragalus arrectrj^ scaphcndes M. E. Jones. 

 Sage-brush plains: Mont. Plain — Suhmord. Je. 



2. R. arcta (Sheld.) Rydb. Perennial, ■with woody base, much branched, 

 1..5-5 dm. high, striate, glabrous; leaflets 13-21, rather distant, oblanceolate, 4- 

 10 mm. long, glabrous, or nearly so; caljx about 10 mm. long; teeth subulate; 

 corolla purplish, about IS mm. long; pod oblong-eUipsoid, 2-2..5 cm. long, taper- 

 ing at both ends; stipe 5-S mm. long, somewhat sulcate on the ventral side. 

 A. Preussii latus Jones. --1. Preussii arctus Sheld. Sandy soil: Utah. Son. 

 My-Je. 



3. R. Preuasii (\. Gray) Rydb. Stems glabrous, B~i dm. high; leaflets 

 1-3-17, fleshy, obovate or rounded, usually retuse, 1-2 cm. long, glabrous; cslyx 

 minutely strigose or glabrate; tube 7-8 mm. long; teeth subulate, 1.-5 mm. long; 

 corolla purple, 20-2.5 mm. long; stipe of the pod 4 mm. long; body oblong, acute 

 at both ends, 2.5 cm. long. A. Preussii A. Gray. River banks: Utah — -Ariz. 

 — s Calif. — Xev. San. Mr-My. 



4. R. praelonga > Sheld.) Fedde & Sydow. Stems 4—10 dm. high, glabrous 

 or nearly so: leaflets 1-5-21. oval, 1-3..5 cm. long, glabrous or nearly so, often 

 retuse: raceme densely flowered: calj'x sparingly strigitlose; tube 6 mm. long; 

 teeth subulate, 2-3 mm. long; corolla ochroleucous, 16-18 mm. long; pod ovoid, 

 abruptly acute, 2-3 cm. long, 10-12 mm. thick, glabrous, indistinctly reticulate. 

 A. prae'lonffiM Sheld. A. sahulosus M. E. Jones. Dry ground: Colo. — ^N.M. — 

 Calif. Sen. — Submord. Ap-My. 



5. R. Pattersonii (A. Gray) Fedde & Sydow. Stems 3-6 dm. high, more or 

 less strigose: leaflets 11-21, oblong, thick, acute or obtuse, 1-2 cm. long, glabrous 

 above, strigose beneath; flowers usually nodding; calyx strigose; tube about 8 

 mm. long; teeth subulate, 3-4 mm. long; corolla ochroleucous, 18-20 mm. long; 

 pod ovoid, long-acuminate, 2-2.5 cm. long, 7-8 mm. thick, glabrous, reticulate. 

 A. Pattersonii A. Grav. Foot-hills and plains: Colo. — Utah. Son. — Suhmont. 

 My. 



28. CTE2J0PHYLLXJM Rydb. 



Stoat perennials, with often several stems rising from the same root and more 

 or leas stoloniferous. Leaves pinnate, with 11-19 leaflets, which ustially are 

 indistinctly jointed to the radbus; stipules ovate, free from the petioles, but 

 (especially the lower j united baek of the stem. Peduncles usually equaUing the 

 leaves: racexoe Aort. Calyx cylindro-campanulate, very gibbous at the base on 

 the upper ade. Corolla ochroleucous, with narrow petals; keel almost straight. 

 Pod oblong, terete, coriaceous, with a subfleshy epicarp, in age cross-wrinkled, 

 with thick and prominent sutures, neither of which is inflexed. 



I/caSets narrow. 



Leaflets fiKform or nearly so, 2— i cm. long, 1—2 mm. wide. 1. C. pectinatum. 



Leaflets linear, 2-3 cm. long, 3-4 mm. wide. 2. C. Grayi- 



Iieafleta oUosig to broadly obovate. 3. C. adanum. 



L. C. i>eetmatuin fHookj Rydb. Stems 3--5 dm. high, erect or decumbent 

 at the base; leaflets l->-21, minutely strigose when young, soon glabrate; raceme 

 short and dense, 5-20-flowered; caljrx sparingly black-strigose; tube b-l mm. 

 loQg; teeth stibolate, 2 mm. long: corolla ochroleucous, about 2 cm. long: pod 

 oWoog-eDipsokl, 1.-5-2 cm. long, terete, 8 nmi. in diameter. Astragahj.^ pectin- 

 <rtiM I)ougL Drv plains: Man. — ^Kans. — Colo. — ^Alta. Plain — Suhmont. Mv- 

 Je. 



2. C. Grayi (Tarryj Rydb. Stems .3—4 dm. high, strigose; leaflets 7-13, 

 ■:ov^-^. glabrous above, sparingly strigiUose beneath; raceme short and dense; 

 calj-A StrigiUose, with blackish hairs; tube 7 mm. long; teeth subulate, 2-3 mm. 

 long; corolla ochroleucoiis, 2-2.-5 cm. long; legume oblong-ovoid, glabrous. A. 

 Grayi Parry. Drj- draws and hiUs; Wyo. Plain. Je. 



