CATALOGUE. 173 



leaves 1-2-piniiately divided ; involucre viscid; corollas whitish (?,) the mar- 

 ginal ones with an expanded limb, but regular and not longer than those of 

 the disk ; pappus 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 CaHfornia. A single specimen with 

 immature heads, but with the chafF of the receptacle very conspicuous, was 

 found on the foot-hills of the Trinity Mountains; 4,800 feet elevation; 

 May. (611.) 



Hymenopappus tenuifolius, Pursh. Whiten ed-tomentose ; stems 8- 

 15' high, leafy at the base, sparingly corymbose towards the summit, often 

 several from a rather stout simple or branched perennial caudex ; radical 

 leaves petioled, 2-4' long, 2-3-pinnately divided with numerous oblong-hnear 

 lobes less than i" wide ; cauline ones sessile, similar but smaller, or 

 reduced to simple hnear bracts ; heads whitish, 4-6" broad, hemispherical- 

 campanulate ; involucral scales oval, appressed, with broad obscurely denti- 

 culate scarious margins ; corolla-tube very short ; achenia more or less 

 silky-villous ; pappus of spatulate-oblong obtuse slightly erose scales, nerved 

 to the middle, as long as the tube of the corolla. — Missouri to Dacotah and 

 Montana, and southward to Colorado and New Mexico. Nevada, perhaps 

 in the East Humboldt Mountains ; the ticket lost. Specimens with the 

 cauline leaves mostly simple and the achenia less villous than in the Colorado 

 specimens. (612.) 



Bahia^ leucophylla, DC. Whitish-tomentose ; stems 5-15' high, 

 very many from a somewhat woody base, naked above, leafy ; leaves 6-12" 

 long, obovate-spatulate or cuneate, entire, or more frequently 3-lobed at the 

 apex or even pinnately incised ; heads solitary on long naked peduncles, 

 9-12" broad ; rays oblong-oval ; achenia obtusely quadrangular with concave 

 sides, glabrous or glandular-pubescent toward the apex ; pappus of very 

 small cuneate-oblong or somewhat quadrate obtuse nerveless erosely toothed 

 scales. — Nutka Sound and Oregon to California ; near Virginia City, 



' BAHIA, LAGASCA. Heads many-flowered, radiate ; rays 5-30, pistillate, fertile ; disk-flo-wers 

 tubular, perfect, fertile, corollas glandular-hairy, 5-toothed. Involucre sub-globose or oampanulate, the 

 scales appressed in one or two rows. Receptacle convex or conical, naked. Branobes of the style in the 

 disk-flowers short, thickened at the apex, and obtuse, or truncate, or with a conical fleshy appendage. 

 Achenia narrowly turbinate or linear, 4-sided. Pappus a crown of short scarious nerveless or rarely 

 1-nerved and even awned scales. — Perennial herbs or suffruticose plants of Western America, from 

 Nutka to ChiU, usually whitish-tomentose, with lobed or incised leaves, and yellow heads on long 

 peduncles or in terminal corymbs. 



