OP ARTS AND SCIENCES. 67 



H. triste, var. granle, Gray, Bot. Calif, i. 481, with var. detonsum. 

 In this variety the long and blackish hairs of the involucre are mostly 

 or wholly wanting, and the grayish pubescence prevails. — Alaska and 

 Brit. Columbia to the Sierra Nevada and higher Rocky Mountains 

 down to Colorado. 

 * * * * Not crinitely hirsute or barbate about the heads, but mostly 



(as in many species) bearing long-setose hairs at base of stem and 



on lower leaves. 



•t- Flowers white : stem leafy and loosely branching, except in sub- 

 alpine or depauperate specimens : leaves little if at all dentate : 

 akenes linear-columnar : pappus sordid. 



H, ALBiFLORUM, Hook. — Rocky Mountains to Brit. Columbia and 

 California. To this without much doubt is to be referred H. Va?icou- 

 verianum, Arvet-Touvet, Spicil. 10. At least all our specimens of 

 Lyall's collection, distributed from Kew as " H. Scoiileri" are of this 

 species, and are white-flowered. A yellow color to the flowers was 

 probably merely inferred by Arvet-Touvet from the name under which 

 he found the plant in Boissier's herbarium. It would appear that at 

 least three species must occur under the name of H. Scouleri in the 

 Kew herbarium. 



-i— -4— Flowers yellow, 15 to 30 in the oblong-campanulate heads: 

 stems leafy, at least below, except in one species, glabrous or merely 

 puberulent above : akenes columnar, not at all tapering upward : 

 pappus from sordid to dull white. 



++ Leaves or many of them salient-dentate : pappus whitish. 



H. AKGUTUM, Nutt. Cauline leaves above rapidly diminished in 

 size, even into linear entire bracts : heads on elongated peduncles in a 

 lax diffuse panicle: involucre more or less dark glandular. — Coast 

 Mountains of California, behind Santa Barbara, &c. HcBnke, Nuttall, 

 Hothrock, Parry. 



H. Parisiiii. More equally leafy up to the narrowly oblong pan- 

 icle; no glandular hairs or stipitate glands: heads short-peduncled : 

 involucre pale, granulose-puberulent. — Rock-crevices, San Bernardino 

 Mountains, S. E. California, Parish Brothers. 



++ ++ Leaves all entii'e, or repand and denticulate. 



H. RrsBYi, Greene, Bull. Torr. Club, ix. 64, Mostly tall, leafy, 

 bearing numerous heads in a compound panicle : leaves all elongated- 

 oblong; cauline usually half-clasping: involucre 3 lines high, pale, 

 barely puberulent : pappus sordid. — Mogollon Mountains, New Mex- 

 ico, Rushj. 



