THISTLE FAMILY 849 



leaves similar, but sometimes entire; heads small, raj'less; involucres nearly 1 

 cm. high "id broad; pappus-bristles barbellate. Hills: w Colo. — N.M. — Utah. 

 SoTi. Au-S. 



16. G. aphanactis Rydb. Apparently perennial; stem 3-4 dm. high, gla- 

 brous and striate; leaves very viscid, oblanceolate, acute, 4-7 cm. long, sharply 

 dentate and sessile, or the lower more or less pinnatifid and petioled; heads 

 about 15 mm. broad; bracts very viscid, subulate; awns of the pappus apparently 

 smooth. Sandy soil: sw Colo. — se Utah — N.M. Son. Jl. 



17. G. Columbiana (Piper) Rydb. Perennial, cespitose at the base; stems 

 about 3 dm. high, glabrous; leaves oblanceolate, denticulate, 3-6 cm. long; 

 heads numerous, rayless; involucres 8-10 mm. high, 10-15 mm. broad; pappus- 

 bristles curved and twisted. G. discoidea Nutt., not H. & A. Sandy places: 

 Wash. — Ida. — Ore. Son. Au. 



10 VANCLEVEA Greene. 



Low tufted desert shrubs, with white shreddy bark and entire leaves. Heads 

 discoid. Involucre turbinate; bracts squarrose, acuminate, very gummj'. Disk- 

 flowers hermaphrodite and fertile; corollas yeUow, club-shaped, with 5 erect 

 teeth. Style elongate ; branches long, sub-terete, papiUose-puberulent. Achenes 

 prismatic, viUous-hirsate. Pappus of about 12 narrowly linear acute squamellae, 

 ciliate on the margins, persistent. 



1. V. stylosa (Eastw.) Greene. Stems 6-10 dm. high, bushy; leaves 3- 

 nerved, hnear-lanceolate, acuminate, 2-3 cm. long, 2-3 mm. wide, vertical by a 

 twist at the base; heads corymbose, 15 mm. high, 10 mm. wdde; pappus-scales 

 3 mm. long, one-third mm. broad. Grindelia stylosa Eastw. Sandy wastes: 

 Utah. Son. Jl. 



11. ACAMPTOPAPPUS A. Gray. 



Low shrubs, glabrous or obscurely puberulent, neither glandular nor resin- 

 ous. Leaves small, linear, entire, without lateral veins. Heads terminal at the 

 ends of the branches, discoid or radiate; involucres globose; bracts closely imbri- 

 cate in 3 series, roimded-oval to oblong, scarious-margined, erose-fimbriate. Disk- 

 corollas yellow, funnelform; style-branches with thickish subulate appendages. 

 Achenes round-turbinate, densely long-viUous. Pappus equaUing the corollas, 

 of 15-18 flattened, rigid awns, slightly dilated at the end, and as many shorter 

 Isetiform awns or bristles. 



1. A. sphaerocephalus (Harv. & Gray) A. Gray. Shrub 3-10 dm. high, 

 [with white striate bark; leaves oblanceolate, sessile, about 1 cm. long, minutely 

 Ipuberulent; heads discoid, depressed-globose, 8-10 mm. high; bracts straw- 

 Icolored, with pale green spots, with scarious erose margins. Desert regions: 

 I Ariz.— s Utah — Calif. L. Son. My-Je. 



12. CHRYSOPSIS Nutt. Golden Aster. 



Biennial or perennial (otus perennial with a cespitose caudex), caulescent 

 lierbs, usually conspicuously pubescent. Leaves alternate. Heads showy, 

 |;olden yeUow, radiate, or rarely discoid, mostly corymbose, many-flowered; 

 joracts narrow, in several series, more or less imbricate; receptacle pitted. Ray- 

 liowers many, pistillate. Disk-flowers hermaphrodite and fertile. Stigmas with 

 linear or subiilate appendages. Achenes flattened. Pappus double, the outer 

 |;eries of small scales or bristles, the inner of nimierous scabrous bristles. 



[leads radiate. 



Involucres strigose. 



Heads sessile or subsessile, subtended by foliagfe-leaves. 



Leaves narrowly linear-oblanceolate, hirsute. 1. C. angustifolia. 



Leaves oblanceolate, obovate, elliptic, or lanceolate, strigose at least when 

 young, except in C. imbricata. 

 Plant about 1 dm. high or less; heads usually solitary.. 

 Involucres 5-8 mm. broad; leaves less than 1 cm. long. 



2. C. cafispitosa. 

 Involucres 10-12 mm. broad; leaves 2-3 cm. long. 3. C. alpicola. 

 Plant 2—6 dm. high; heads corymbose. 

 )•■ 31 



