334 COMPOSITE. Hklianthella. 



Style bulbous at the base. Summit of the achenium obscurely cororiiform, 

 produced into a short somewhat lacerate tooth at the principal angles (the 

 inner angle strongest), and very obscurely toothed at the intermediate angles. 



§2. Receptacle fiat ; the chaff broad, chartaceo-membranaccous, entire: scales 

 of the involucre squarrose-spreading ; the ijiner linear-lanceolate ; the exte- 

 rior foliaceous, or some of them changed into leaves: branches of the style 

 smooth below, terminated by a short dilated or spatulate appendage, icith 

 hispid margins : teeth of the corolla densely puberulent externally: ovaries 

 fiat, with narrow ivinged margins. 



3. H. Douglasii : stem (the upper portion) hirsute with spreading hairs ; 

 striate-angled ; leaves oblong-lanceolate, acuiish, sessile, triplinerved, gla- 

 brous, ors|)arsely hirsute-))ubescent on the midrib and margins; head solitary, 

 pedunculate; the winged margins of the young achenia lacerate-fringed at 

 the summit, not avvned ; intermediate squamellfe obsolete or none. 



Interior of Oregon ; " common on the subalpine range of the Blue Moun- 

 tains, 3-5 feet high, rarely branching," Douglas ! in herb. Hook. — The spe- 

 cimen wants the lower part of the stem : it appears to be nearly allied to Mr. 

 Nuttall's Leighia lanceolata ; but the leaves are closely sessile and tripli- 

 nerved at a considerable distance from the base : the solitary head (the flat 

 disk an inch in diameter, the rays about 24,) is borne on a hirsute peduncle 

 2 inches long ; and (he wings of the ovary, which form lacerate appendages 

 at the summit, are not produced into awns. Better specimens, however, are 

 needed for the proper determination of these species. — The corolla in this 

 genus exhibits the ordinary venation of the family ; but some flowers of this 

 species present the intermediate nerves, like most Helianthi. 



4. H. lanceolata: nearly glabrous; stem grooved, bearing 2-3 or more 

 subsessile heads ; leaves lanceolate, acuminate at each end, petioled, 

 3-nerved, a little hairy ; the upper and lower alternate, the intermediate op- 

 posite ; achenia short, obcordate, the narrow (not ciliated) wings produced 

 into slender persistent awns twice or thrice the length of the ovary ; interme- 

 diate squamellas obsolete. — Leighia lanceolata, Nutt. ! in trans. Amer. phil. 

 soc. [n. ser.) 7. p. 365. 



Rocky Mountain plains, and Upper California? Nntfall. — Having no spe- 

 cimens (except the ovaries), we have drawn the character from Mr. Nuttall's 

 descri]Jtion. The stem is said to be 12 to 18 inches high ; the lower leaves 

 6-8 inches long, an inch broad. Rays 12-14 : the chafl'retuse. 



5. H. unifiora: stem and leaves clothed with a short and soft somewhat 

 cinereous ])ubescence; leaves lanceolate-oblong, rather acute, triplinerved, 

 narrowed at the base, sessile, the middle ones sometimes opposite ; head sol-' 

 itary on a long naked peduncle; involucre leafy at the base; the narrow 

 wings of the young obovate achenia ciliate, each bearing at the summit 1 or 

 2 stout apparently persistent awns as long as the ovary ; intermediate squa- 

 mellae 2-4, obtuse, lacerate. — Helianthus uniflorus, iN'w/i. .' in jour. acad. 

 Philad. 7. p. 37. Leighia uniflora, Nutt. ! in trans. Amer. phil. soc. I. c. 



Rocky Mountains, on the sources of the Missouri, Mr. Wijelh ! June. — 

 Resembles the preceding; and like them with the nerves of the leaves con- 

 nected by transverse reticulated veinlets. Rays 15-20, more than an inch 

 long. — This species makes a nearer approach to Leighia than the others, but 

 certainly it does not belong to that genus. 



Leighia? Hool'eriana, Nutt. 1. c.= Helianthus Hookerianus, DC. =H. longifolius, 

 "ook. (not of Pwrsh), is Wyethia robusta, Nutt. ! Leighia debilis, Nutt. 1. c. (in a 



Hook 



