THISTLE FAMILY 939 



m 



they fall; paleae in a single series surrounding the disk-flowers. Ray-flowers 

 pistillate and sterile; ligules cuneate, 3-cleft. Disk-flowers about 5, hermaphro- 

 dite and fertile. Ray-achenes obovate-oblong or clavate, obcompressed. 



1. L. ramosissima Nutt. Stem 2-8 dm, high, at least diffusely branched, 

 glabrate or slightly pilose when young; lower leaves spatulate, the upper linear 

 or nearly so, softly silky-canescent ; head about 6 mm. high; bracts silky-ciliate; 

 Ugules short, purplish, clavate, carinate along the upper side, about 3 nun. long. 

 Dry ground: Wash.— Ida.— Nev.— Calif. Son. Je-S. 



86. BLEPHARIPAPPUS Hook. 



Annuals, with mostly alternate leaves. Heads radiate. Bracts of the invo- 

 lucre broad, flattened on the back below, with thin, infolded margins, enclosmg 

 the ray-achenes; paleae in a series between the disk- and ray-flowers and occa- 

 sionally some among the latter. Ray-flowers 8-20, pistillate and fertile; hgu es 

 conspicuous, various-colored. Disk-flowers hermaphrodite and mostly sterile; 

 corollas yellow; lobes pubescent. Achenes of the ray-flowers obcompressed, 



without pappus. 



1. B. glandulosus Hook. Annual; stem 1-4 dm. high, diffusely brancliea, 

 more or less hirsute, glandular at the summit; leaves lanceolate or linear, hirsut^, 

 the lower laciniate-pinnatifid or lobed, the upper entire; mvolucres 7-8 mm. high, 

 12-15 mm. broad; bracts lance-linear, acute, hispidulous and with some black 

 glands below; ligules 8-13, white, about 1 ^m. long, 3-lobed; pappus w_hite 

 Layia glandulosa Hook. & Arn. Sandy places: B.C.-Ida.-w N.M.-s Calif. 

 Son. Mr-Je. 



87. PSILO STROPHE DC. Paper Flower. 



Tomentose or woolly perennial (all ours) or rarely biennial herbs, or low 

 shrubs Leaves alternate, entire or lobed. Involucre cyhndric or campanulate, 

 brSSm a single series, ' equal, connivent, sometimes --fj^. ^.P^^^^lZf 

 within; receptacle naked. Ray-flowers few, pistillate and fertile, hgules broad 

 Ilobed yellow, becoming papery, persistent. Disk-flowers hermaphrodite and 

 Mle; coronas' yellow. Style-bmnches trmicate ^t the apex. Achenes hnear, 

 striate Pappus of lacerate or ciliate squameUae. [Riddellia Autt.J 



4. p. Cooperi. 

 Stem densely wlute-pannose. 



1 P Bakeri Greene Stem much branched, 1-2 dm. high, loosely floccose; 

 basal* iLefs 10 cS long, petioled; blades spatulate, more or Ifs distinctly 

 S ribbed involucres 7-10 cm. high and nearly as broad; ligiJes 5, 10-15 mm. 

 bSfaSes ^£ous, striate. P. pumila (M. E. Jones) A. Nels. Dry plams 

 ind hills- Colo.— Utah. Suhmont. My-Je. 



2 P Taeetinae (Nutt.) Greene. Stem 1-3 dm. high, diffusely branched 

 looselv vita lower leaves spatulate, 2-5 cm. long, entire or lobed; upper leaves 



narrowly otoceo^ heads nmnerous, P^^^l^te: i^^?lr?..tLT-& G 

 and a mle less broad ligules 3-5 5-8 mm. long. Rvddelha lageHna T. & G. 



Drv Dlains- Tex.— Colo.— Ariz.; n Mex. Son. Je-S. 



