484 FABACEAE 



k^l about 8 mm long, nearly twice as long as the banner. Dalea nana elatior 



Q K^Vl ' ?^^- *^ •r°'il^-' in part- P- rubescens Coult. & Nels., not D. rubescens 

 S. Wats. Dry soil: Tex.— Colo.— Ariz. Son. Jl. 



10. P. aurea (Nutt.) Britton. Stems few, strigose-canescent: leaflets 5-9, 

 oblong, obovate, or oblanceolate, 6-18 mm. long, obtuse or mucronate, silvery- 

 canescent; spikes 2-7 cm. long; bracts broadly ovate, short-acuminate; coroUa 

 yeUow not turning red or purple; keel about 12 mm. long, about twice as long 

 as the banner. Plains and hills: S.D.— Mo.— Tex.— Colo. Plain. Je-Au. 



15. PETALOSTEMON Michx. Prairie Clover. 



Perennial (all ours), or annual caulescent herbs, with glandular-dotted foli- 

 age. Leaves alternate, odd-pinnate. Flowers perfect, in spikes, not subtended 

 by involucres. Calyx campanulate; teeth short and broad. Corolla white, 

 purple, pink, or yellowish; banner broad, clawed; wing- and keel-petals similar 

 to each other, narrower, distinct, inserted at the mouth of the starainal tube, 

 between the stamens Stamens 5, monadelphous. Pods short, indehisccnt, 

 mostly 2-ovuled, but 1-seeded. 



Calyx glabrous except the teeth; corolla white. 



Spikes compact; bracts longer than the buds; leaflets 1.5-2.5 cm. long. 



Spikes looser; bracts shorter than the buds; leaflets usually less than f 5 cm!^'long. 



Calyx pubescent. ^- ^' oUgophyllus. 



CoroUa white or yellow; spike long and compact. 



Leaves glabrous ; corolla white or ochroleucous. 3 P comvactus 



Leaves sparmgly silky; corolla yellow. 4 p Sscens 



Corolla rose or purple, very rarely white jiaiebcenb. 

 Leaflets mostly 5, linear or nearly so ' 



Pubescence of the calyx long silky-pUose; bracts lanceolate, acute; leaflets of 



the lower leaves oblong, obovate. or cuneate. 

 Bracts glabrous or short-pilose. «; P ^pnrJ<:inp 



Bracts silky, long-pilose. "^ f* ^- orZtus 



Pubescence of the c^^^^^^ dense, and short; bracts ovate. viUoas; S a long 



subulate glabrous acununation. 

 Leaflets^lmear, conspicuously glandular-dotted; bracts longer than the 



If^S ^^H i*^^^^^ glabrous or sparingly hairy. 7. P. purpurem, 



fetem and leaves densely villous. 8 P mollis 



Bf^^^^l^^^^^*^"^^^^* ^"^ glandular-dotted; bracts shorter than the 



9. P, pubescens, 

 10. P. villosus. 



calyces. 

 Leaflets 7-17, oblong. 



K. ?• fl ."" ^^^n"^v (W^"-^) ^^ii<^hx. Stems several, erect, 3-7 dm. high, gla- 

 brous, eaflets 7-9, hnear, oblong or oblanceolate, 1-3 cm. long, acute or mucro- 

 nate, glabrous; spike 2-10 cm. long, compact; bracts subulate-tipped; calyx 3 

 mm. long; lobes tnangiilar to lanceolate, shorter than the tube; corolla white. 

 Prairies: Ind.— La.— Tex.— Sask. Plain. Je-Jl. 



I,- u'u' °[^?0P^yll^s (Torr.) Rydb. Stems erect or decumbent, 3-10 dm. 

 high, branched, glabrous; leaflets 5-9, firm, linear, oblanceolate, or elliptic, acute 

 or mucronate, glabrous; spike oblong, becoming more or less cylindric and looser, 

 cm- long; bracts with filiform tii)s; calyx-lobes 3 ram. long, triangular, acute; 

 coroUa white. P. gracilis oligophyllus Torr. Plains, prairies, and canons : Minn, 

 —la.— Tex.— Ariz.— .\lt a. Plain— Suhmont. Je-Au. 



lonifv ^\ compactus (Spreng.) Sweezy. Stems few, glabrous, 3-8 dm. high; 

 leaflets 5-7, oblong-oblanceolate or hnear-oblong, 8-25 mm. fong; spike long- 

 ^it f ' *'^^'^;^"'=' compact, 4-15 cm. long, about 13 mm. thick; calyx silky- 

 rS ' T^™""- c^'^i v^f,**" lanceolate, acute; corolla ochroleucous. P. macro- 

 stachyus Torr. Sand hills and plains: Neb.— Colo. Plain. Jl-Au. 



^w *' ^' S ^®^*^^^?o^- ^^*^,- ®*^^™ glabrous, about 3 dm. high ; leaflets narrowly 

 oblong obtuse, 6-12 mm long, sparingly silky; spike dense, long-peduncled, 



Ion jf""" ^^^'"^ ^^^y-^^''^; teeth subulate. Dry rocky hSls: s Utah.' 



uJ%^' ?«^^ia«.^- Gray. Stem glabrous, branched below, 3-5 dm. high; 

 leaflets ;>-7, Imear-oblanceolate to cuneate or ovate, obtuse, rounded or retuse at 



