CATALOGUE. 
173 
leaves 1-2-pinnately divided ; involucre viscid; corollas wliitisli (I ,) the mar- 
ginal ones with an expanded limb, but regular and not longer than those of 
the disk ; j^appus of 4 ovate-lanceolate acuminate scales ; receptacle bearing 
among the flowers a few (5-10) setaceous palets as long as the involucre." — 
Deserts of Arizona and Southeastern California. A single .specimen with 
immature heads, but with the chatf of the receptacle v(m-v conspicuous, was 
found on the foot-hills of the Trinity Mountains; 4,800 feet elevation; 
May. (611.) 
Hymenopappus tenuifolius, Pursli. Whitened-tomeniose ; stems 8- 
15' high, leafy at the base, sparingly corymbose towanls llic summit, ollen 
several from a rather stout simple or branched perennial caiidex ; radical 
leaves petioled, 2-4' long, 2-3-pinnately divided with numerous oblong-linear 
lobes less than wide ; cauline ones sessile, similar bul stnalltM-, or 
reduced to simple linear bracts; heads whitish, 4-6" broad, Jieniis})herical- 
campanulate ; involucral scales oval, appr(\<sc(], with broad obscurely denti- 
culate scarious margins; corolla-tube very short; achenia more or less 
silky-villous ; pappus of spatulate-oblong obtuse slightly crosc scales, nerved 
to the middle, as long as the tube of the corolla. — Missouri to Dacotah and 
Montana, and southward to Colorado and Kew Mexico. Nevada, p('rlia[)s 
in' the East Humboldt Mountains; the ticket lost. Specimens wilh the 
cauline leaves mostly simple and the achenia less villous than in the Colorado 
specimens. (612.) 
Bahia* LEUCOPiiYLLA, DC. Whitish-tomentosc ; stems 5-15' high, 
very many from a somewliat woody base, naked above, leafy ; leaves b'-12" 
long, obovate-spatulate or cuneate, entire, or more frequently 3-lobe<l at the 
apex or even pinnately incised ; heads solitary on long naked ix'duiicles, 
9-12" broad; rays oblong-oval; achenia obtusely (puulrangular wilh concave 
sides, glabrous or glandidar-pubescent toward the a[)e.\ ; pap[)us of very 
small cuneate-oblong or somewhat quadrate ol)tus(i nervel(\ss erosely loolhed 
scales. — Nutka Sound and Oregon to California; near Mrginia Cify, 
> BAIIIA, LAGASCA. HcadM iiiany-Uowered, radiuto ; rays 5-30, pisfillati', fcrtih-; di.sk-flowers 
tubular. ]>i'dt>ct, fertile, corollas rrlaiidular-liairy, 5-toothed. Involucre siili-frlobusc nr < aijii)ami!ate, the 
scales a]i]trcssed in oue or two rows. Keceptade convex or conical, naked. I5ian( Iies of the style in the 
disk-dowers .short, thickened at the ai)cx, and obtuse, or truncate, or with a conical tifsliy appendage. 
Achenia narrowly tnrliinate or linear, 4-sided. Pappus a crown of short scarious nerveless or rarely 
1-nerved and even awned scales. — Perennial herbs or suflFrutieose ]dants of Westeiii Airierica, from 
Nutka to Chili, usually whitish-tomeutose, with lobed or incised loaves, and yellow heads on long 
peduncles or in terminal corymbs. 
