;^96 BOTANY. 



Spring Valleys, Nevada, and Bear River Canon ; 6-8,000 feet elevation ; 

 July-September. (690.) 



CiRSiUM EEiocEPHALUM, Gray. Proc. Acad. Fkil, March, 1863, p. 69. 

 Stem 1-2° high, simple, leafy, deciduously arachnoid-tomentose ; leaves nearly 

 smooth above, paler and webby beneath, far decurrent, linear, pinnatifid with 

 very numerous and crowded short very spiny lobes ; heads several, sessile in 

 a dense terminal cluster, involucrate with very spiny foliaceous bracts, which 

 pass gradually into spinulose-cihate spine-tipped involucral scales ; innermost 

 scales entire, spine-tipped ; flowers yellow.— Alpine regions of the peaks of 

 Colorado, (Parry, Hall & Harbour, Vasey 348.) Var. leiocephalum. Leaves 

 smooth on both sides ; heads very prickly, but entire destitute of wool or pu- 

 bescence ; otherwise as in the type. — An intermediate form was collected in 

 Colorado by Hall & Harbour. Cottonwood Canon, Wahsatch, and in the 

 Uintas on a high divide at the head of Bear River; 8-10,500 feet elevation; 

 July, August. (691.) 



Calais^ linearifolia, DC. Scapes simple, 5-14' high; leaves at first 

 softly pubescent and cihate, linear-acuminate, entire or laciniately pinnatifid 

 with a few linear lobes ; involucre of 9-12 unequal smooth lanceolate scales ; 

 achenia 5'' long, linear-fusiform, short-beaked ; scales of the pappus 5, linear- 

 lanceolate, equaling the achenium, the apex bifid, and the midrib produced 

 into a slender awn much shorter than the scale. — California to New Mexico 

 and Chihuahua. Washoe Valley, Trinity and East Humboldt Mountains, 

 Nevada, and Stansbury Island ; 4-5,000 feet elevation; May, June. (692.) 



Calais MACEOCHiETA, Grray. (?) PI. Fendl. 112. A single small imma- 

 ture plant, perhaps of this species, was collected in the Trinity Mountains on 

 granite rocks. The species may be known by the short oblong bifid pappus- 

 scales, with an awn at least three times longer than the scale ; the general 

 habit much as in the last. (693.) 



Calais nutans, Gray. Pac. R. R. Reports, 4. 113. {Ptilophora nutans, 

 Gray. PL Fendl. 113.) Glabrous, very slender ; stems 6-18' high, simple or 

 branching ; leaves narrowly linear, acuminate, entire or with a few subulate 

 spreading lobes ; involucre cylindrical, 8-20-flowered, calyculate ; outer bract- 



' CALAIS, DC. " Heads many- (rarely few-) flowered ; (the flowers all ligulate.) lavolucre cylin- 

 draceous or campanulate, either simple and calyculated [bracteolate] at the base, or imbricated with the 

 scales in a few rows. Eeceptaole flat, naked. Achenia terete, 12-14-striate, bealdess or attenuated up- 

 ward and beaked. Pappus simple, of 5-10 or 14-22 scarious awned scales, the awns scabrous, barbellate 

 or plumose.— Herbs of Northwestern America, with long naked monooephalous scapes or branches, and 

 yellow flowers," Gkay, Pac. B. B. Reports, 4. 112, 



