940 CARDUACEAE 



ligules mostly 5, 

 at the summit 



half as long as the disk-corollas. Gravelly plains: Ariz.— s Utah— s Calif.; L. 

 Calif. L. Son. Ap-My, 



88. BAIL6YA Harv. & Gray, Wild Marigold. 



Annual or perennial floccose herbs. Leaves alternate, pinnatifid or the upper 

 entire. Heads radiate. Involucre hemispheric; bracts equal, woolly, in two 

 series; receptacle flat, naked, alveolate. Ray-flowers pistillate and fertile; hgules 

 oval or oblong, yellow, 7-nerved, becoming papery, persistent. Disk-flowers 

 hermaphrodite and fertile; corollas yellow. Anthers minutely sagittate at the 

 base. Style-branches short, truncate. Achenes linear, truncate, many-ribbed. 



Pappus none. 



Plant leafy throughout; annual. IS' ^^^?/v^^!'2/n" 



Plant naked above, almost scapose; biennial. ^. -t>- muuiraaiaiu, 



1. B. pleniradiata Harv. & Gray, Stem 2-4 dm. high, floccose, leafy and 

 branched; lower leaves incise-pinnatifid, with oblong or linear divisions, loosely 

 floccose, the upper merely toothed or entire; heads solitary at the ends of the 

 branches; pedimcles 5-10 cm. long; involucres about 6 mm. high and 12 mm. 

 broad; hgules 25-40, about 1 cm. long, 5 mm. wide. B. multiradiata A. Gray, 

 not Harv. & Gray. Plains: Ariz.— Utah— s Calif; n Mex. Son.. Ap-N. 



2. B, multiradiata Harv. & Gray, Stem decumbent at the base, and 

 leafy only below, very floccose; leaves pmnately or ternately pinnatifid; divisions 

 again cleft with obovate or elliptic divisions; peduncles 1-2 dm. long; involucres 

 about 8 mm. high, 15-20 mm. broad; ligules about 50, 12-15 mm. long golden- 

 yellow. B. multiradiata nudicaulis A. Gray. Dry plains: w Tex. — s Utah — Nev. 



-Ariz. ; n Mex. Son. Ap-0 



MONOTHRIX 



Low scabrous undershrubs. Leaves mostly alternate, small, punctate, 

 mostly ovate. Heads radiate or discoid. Involucre hemispheric; bracts in two 

 equal series, boat-shaped, double-ribbed, partly enclosing the marginal achenes; 

 receptacle flat, alveolate. Ray-flowers, if present, pistillate and fertile. Disk- 

 flowers many, hermaphrodite and fertile, Achenes flat, with a thick margin. 

 Pappus of 1 barbellate awn or wanting. 



1. M. Stansburii (A. Gray) Rydb. Stems 1-2 dm. high, diffusely branched; 

 lower leaves opposite, the upper alternate, petioled; blades ovate or rhombic- 

 ovate, dentate, 1 cm. long or less, scabrous, triple-veuied; involucres 5-6 mm. 

 high and fully as broad; bracts linear, acute; ligules 6-10, oblong, 3-4 mm. long; 

 pappus-bristle present, shorter than the disk-corollas, Laphamia Stansburii A. 

 Gray. Among rocks: Utah. Son. Je-JL 



90. PERICOME A. Gray, 



Tall, strong-scented perennial herbs. Leaves opposite, petioled; blades 

 hastate or triangular. Heads discoid in large cymes. Involucre turbinate-cam- 

 panulate; bracts in a single series, more or less united below, hyaline-margmed, 

 with thick midrib. Flowers hermaphrodite and fertile; corollas pale yellow, 

 4-toothed, Anthers subsagittate at the base. Style-branches filiform, obtuse. 

 Achenes linear-oblong, compressed, hispid-ciliate on the margins. Pappus a 

 cro%vn of fimbriate-lacerate squamellae, sometimes with two marginal awns. 



1. P- caudata A. Gray. Widely branching perennial, 1 m. high or niore; 

 leaf-blades thin, green, minutely resinous-granuliferous, triangular-hastate, 5-15 

 cm. long, sparingly sinuate-dentate, caudately long-acnminate; involucres about 

 5 mm. high and 6 mm. wide. Rocky canons: N.M. — Colo.— Calif,; n Mex. 

 Submont. Jl-O. 



91. PICRADENIOPSIS Rydb. 



Low perennial canescent herbs, more or less woody at the base. 



ite, pedately 3-5-divided, with linear divisions, or the upper ent 



iate, corymbose. Involucre campanulate; bracts subequal, in two series 



Leaves op- 

 re. Heads 



y 



