172 BOTAHT. 



and pappus. Fig. 3. Corolla. Fig. 4. Stamen. Fig. 5. Style ; all enlarged 

 three diameters. (607.) 



Ch^nuctis Douglasii, Hook. & Arn. {Ch. achilleoefolia, H. & A.) 

 Biennial and sometimes annual, whitened with a close tomentum, or rarely 

 smoothish ; stems from 2'-3° high, simple or much-branched, often several 

 from one root ; leaves somewhat fleshy, 1-3' long, ovate-oblong in outline, 

 2-3-pinnatifid with very numerous and often crowded minute oblong-obovate 

 or rounded lobes ; heads few-many, corymbed ; involucres turbinate or cam- 

 pan ulate, the oblong-linear scales in 1-2 series ; flowers 6-7'' long, whitish 

 or flesh-colored ; corollas pubescent ; marginal ones scarcely larger ; achenia 

 linear, hispid, blackish, as long as the corolla ; pappus of about 10 unequal 

 oblong or lanceolate erosely denticulate scales, i— | as long as the achenium. — 

 A variable plant, presenting numerous forms dependent upon exposure, soil, 

 &c., but none of them can be considered well-marked and permanent 

 varieties. The name Douglasii, being older than achillecefolia, is taken for 

 the united species. The larger pappus-scales sometimes have a well-defined 

 mid-nerve. A good figure of a common form of the plant is given in Plate 

 VI of Stansbury's Eeport. Oregon and California to Colorado and Arizona ; 

 Western Nevada, (Bloomer ! and Anderson !) Common throughout Nevada 

 and Utah, from 4,000 feet elevation upward; May-October. (608.) A 

 dwarf alpine form, with the leaves having densely crowded minute lobes 

 and the heads few and rather large, is Brewer's 1901, from California, and 

 the same was found on rocky ridges of the Uintas about Bear River Canon, 

 at 10,000-12,000 feet elevation. (609.) 



Chjsnactis stevioides. Hook. & Arn. Annual, glabrous, or at first 

 puberulent above ; stems 6-10' high, branched from the base, corymbose 

 above ; leaves 1-2-pinnately divided, the divisions linear, obtuse, entire, I" 

 wide ; involucre gland ular-puberulent, the scales spatulate-oblong, in two 

 rows; flowers white or flesh-color; corollas tubular-funnel-shaped, the 

 marginal ones shorter and a little more expanded ; achenia hirsute; pappus 

 of 4-5 subequal lanceolate acute denticulate scales. — Oregon and California 

 to New Mexico ; Strong's Knob, Great Salt Lake, (Stansbury.) Foot-hills 

 and ridges of Trinity Mountains and Reese River Valley, Nevada, and on 

 Stansbury Island, Great Salt Lake ; 4-5,000 feet elevation ; May-July. (610.) 



Cii^NACTis CAEPHOCLiNiA, Gray. Bot. Mex. Bound., p. 94. " Annual (?,) 

 at first lanulose, soon glabrous, somewhat viscid ; stem much branched ; 



