Part 1, 1914] CARDUACEAE : HELENIEAE 37 



rowly linear, entire or again dissected segments; heads at the end of the branches; peduncles 

 2-5 cm. long; involucre hemispheric, 6-7 mm. high, 10-12 mm. broad; bracts usually rather 

 narrowly oblanceolate, acuminate, white-tomcntosc; ligules yellow, linear, 7-8 mm. long; tube 

 of disk-corollas nearly 2 mm. long, glandular; throat campanulate, fully 1 mm. long; achenes 

 narrowly obpyramidal, 5 mm. long, 4-angled, villous and striate; squamellae of the pappus 1.5 

 mm. long, obovate, truncate, the dorsal thickening lanceolate, extending about two-thirds their 

 length. 



Type locality: Aguascalientes, Mexico. 



Distribution: Arizona and Texas to Aguascalientes and Durango. 



11. Bahia dealbata A. Gray, Mem. Am. Acad. II. 4: 99. 1849. 



Bahia absinlhifolia dealbata A. Gray. PI. Wright. 1: 121. 1852. 



Picradeniopsis dealbata Wooton & Standley, Contr. U. S. Nat. Herb. 16: 192. 1913. 



A perennial with a woody base; stem branched, about 3 dm. high, white-tomentose; 



leaves opposite, subsessile or short-petioled, white-tomentose, 1-5 cm. long, 3-cleft with 



lanceolate or linear, entire or toothed segments, or the lower leaves lanceolate and entire; 



peduncles at the ends of the branches, 2-6 cm. long; involucre hemispheric, 7 mm. high, 



12-13 mm. broad; bracts 12-15, tomenfose, broadly oblanceolate, acuminate; ligules linear, 



yellow, 18-20 mm. long; disk-corollas yellow; tube 2 mm. long, glandular; throat about 1 



mm. long, campanulate; achenes about 5 mm. long, narrowly obpyramidal, strongly 4-angled, 



villous and distinctly striate on the faces; squamellae of the pappus 1.5 mm. long, obovate, 



truncate, with the dorsal thickening lanceolate and two-thirds their length. 



Type locality: Valley between Mapimi and Giiajuquilla, Chihuahua. 

 Distribution: Western Texas to Arizona and Chihuahua. 



28. AMAURIOPSIS Rydberg, gen. nov. 



Glandular-pubescent annuals. Leaves alternate, twice or thrice ternately divided. 

 Heads in leafy corymbs, radiate. Involucre hemispheric; bracts 16-20, herbaceous, oblanceo- 

 late in about 3 series. Receptacle fiat, alveolate. Ray-flowers 16-20, pistillate, fertile; ligules 

 cuneate, 3-cleft. Disk-flowers numerous, hermaphrodite and fertile; corolla-tube densely 

 glandular, longer than the funnelform throat; teeth lanceolate, longer than the throat. 

 Achenes elongate and narrowly obpyramidal, 4-angled, striate, rounded at the apex. Pappus 

 wanting. 



Type species, Amaiiria dissecta A. Gray. 



1. Amauriopsis dissecta (A. Gray) Rydberg. 



Amauria dissecta A. Gray, Mem. Am. Acad. II. 4: 104. 1849. 

 Villanova chrysanthemoides A. Gray, PI. Wright. 2: 96. 1853. 

 Bahia chrysanthemoides A. Gray, Proc. Am. Acad. 19: 28. 1883. 

 Bahia dissecta Britten, Trans. N. Y. Acad. Sci. 8: 68. 1888. 

 Eriophyllum chrysanthemoides Kuntze, Rev. Gen. 307. 1891. 

 Villanova dissecta Rydb. Bull. Torrey Club 37: 333. 1910. 



A tall annual; stems 3-6 dm. high, puberulent and glandular, especially above; leaves 



1-3 times ternately divided into obovate, oblong, or oblanceolate toothed divisions, puberulent; 



involucre hemispheric, 6 mm. high, 10-13 mm. broad; bracts oblanceolate, acuminate. 



glandular-hirsute; ligules spatulate, 6-8 mm. long, 3-cleft with rounded teeth; disk-corollas 3 



mm. long; achenes narrowly obpyramidal, 4 mm. long, 0.5 mm. thick, glandular-puberulent, 



Type locality: A few miles east of Mora River [New Mexico]. 

 Distribution: Wyoming to New Mexico, Arizona, and Chihuahua. 

 Illustration: Clements, Rocky Mt. Fl. pi. 41, f. 1. 



29. PLATYSCHKUHRIA Rydb. Bull. Torrey Club 33: 154. 1906. 



Schkuhria § Platyschkuhria A. Gray, Am. Nat. 8: 213. 1874. 

 Bahia § Platyschkuhria A. Gray, Syn. Fl. N. Am. 2': 332. 1884. 



Perennial grayish puberulent herbs w^th rather thick woody bases. Leaves alternate, 

 petioled, entire. Heads radiate, corymbose. Involucre hemispheric; bracts herbaceous in 

 about two series, subequal. Receptacle glabrous, flat. Ray-flowers about 10; ligules yellow. 



