352 PROCEEDINGS OF THE AMERICAN ACADEMY. 



11-15 mm. long, the outer shorter; pales about 15 mm. long, faintly 

 nerved, pubescent on the back and subherbaceous narrow tip; disk- 

 corollas 8 mm. long, tube f length of throat; achenes 1 cm. long, 

 obovate, very villous, the callous margin emarginate at apex. 



Encelia nutans Eastw. Zoe ii. 230 (1891); Jones, Proc. Calif. Acad, 

 ser. 2. V. 701 (1895). 



Enceliopsis nutans A. Nels. Bot. Gaz. xlvii. 433 (1909). 



Verhesina scaposa Jones, Zoe ii. 248 (1891), & Proc. Calif. Acad. 1. c. 

 (1895). 



Specimens examined: Colorado: Grand Junction, May 1892, 

 Alice Eastwood (GN 3°); Utah: Green River, alt. 1340 m., 23 May 

 1895, Jones 11859 (hb. Jones). Type material collected by Miss 

 Eastwood on Orchard Mesa, Grand Jimction, 17 May 1891. Ver- 

 hesina scaposa Jones was described from material collected in sandy 

 deserts near Grand River, eastern Utah, at Cisco, 2 May 1890. — This 

 species grows in very poor clay soil containing a little active alkali 

 (sodium carbonate) in open deserts (Jones, in litt.). 



* * Heads radiate; plants densely white-pubescent. 



-»- Heads smaller, the rays 31 1-2.5 cm. long; pubescence rather dull, not 



silvery; leaves mostly obtuse or rounded. 



2. E. nudicaulis (Gray) A. Nels. Caudex more or less branched 

 from a thick woody root, the branches short and stout, woolly and 

 covered with the thick crowded bases of former leaves; leaves tufted, 

 ovate to orbicular, subacute to rounded at both ends, white with a 

 dense fine simple pubescence of several-celled glandular-based hairs, 

 2.5-6.5 cm. long, 1-6.5 cm. wide, on margined petioles one to three 

 times their length; scapes 1.5-2.5 dm. high, pubescent like the leaves, 

 usually bractless; heads 4-8 cm. in diameter including the rays; 

 involucre densely pubescent like the leaves and stem, 3-seried, the 

 scales slightly unequal, subulate-lanceolate from an ovate base, 

 bluntish, 1-2 cm. long, equaling or barely surpassing the disk; rays 

 about 20, glandular-pubescent on tube and back, tridentate, about 

 11-nerved, 1-2.5 cm. long, 2-6 mm. wide; disk-corollas 7 mm. long, 

 with short tube and thick-cylindric throat, more or less glandular- 

 pubescent; pales 12-15 mm. long, scarious, pubescent on back and 

 tip and somewhat glandular, often laterally 1-toothed; mature 

 achenes cuneate, 9 mm. long, 3.5 mm. wide, rather shortly silky- 



30 In citation of specimens F = Field Museum; G = Gray Herbarium; 

 N = National Herbarium. 



31 Ligule measurements are taken exclusive of tube. 



