COMPOSITE, (composite fasiily.) 199 



7. E. Strigdsnin, Muhl. (Daisy Flbabane.) Stem panicled-corjm- 

 bose at tlie summit, roughish like the leaves with, minute oppressed hairs, or almost 

 smooth; leaves entire or nearly so, the upper lanceolate, scattered, the lowest 

 oblong or spatulate, tapering into a slender petiole ; rays white, twice the length 

 of the minutely hairy involucre. (E. integrifolium, Bigel.) — Fields, &c. ; com- 

 mon. June- Aug. — Stem smaller and more simple than the last, with smaller 

 heads but longer rays. 



§ 5. ERIGEEIDIUM, Torr. & dr. — Says about 30, in a single rouo, rather 

 broad: pappits simple: achenia mostly i^nerved: not perennial. 



8. E. vernum, Torr. & Gr. Glabrous; leaves clustered at the root, 

 oval or spatulate; scape leafless, slender (l°-2° high), bearing 5-12 small 

 corymbed heads ; rays white. (E. nudicaule, McAr. Aster vemus, i.) — Low 

 grounds, E. Virginia and southward. May. 



1.5, DIPLiOPAPPlTS, Cass. Double-bkistled Astee. 



Heads many-flowered, radiate ; the rays 8-12, pistillate. Scales of the invo- 

 lucre imbricated, appressed, narrow, 1-nerved or keeled, destitute of herbaceous 

 tips. Receptacle flat, alveolate. Achenia flattish. Pappus double ; the outer 

 of veiy short and small stiff bristles, the inner of capillary bristles as long as 

 the disk-corolla. — Peiennials with coiymbose or simple heads : disk-flowers yel- 

 low ; rays white or violet. (Name composed of 8117X009, double, and Trainros, 

 pappus, the character which distinguishes the genus from Aster.) 



§ 1. Bays violet, showy: head solitary, pretty large: involucre much imbricated: 

 achenia silky : bristles of the inner pappus all alike. 



1. D. linariifolius, Hook. Stems (6' -20' high), several from the 

 same woody root, mostly simple, very leafy; leaves rigid, spreading, linear, 

 strongly l-nerved, smooth, with very rough margins. — Dry soil; common. 

 Sept., Oct. 



§ 2. Bays white: heads smaM, corymbed: involucre shorter than the disk, imbricated 

 in about 3 rows : achenia S)noothish : bristles of the inner pappus Unequal, some of 

 them thickened at the tip : leaves large, scattered, membranaceous, veiny, entire. 



2. D. nmbellatUS, Torr. & Gr. Smooth, leafy to the f»p (2° -6° 

 high) ; leaves lanceolate, elongated, taper-pointed and" tapering at the base (3' - 6' 

 long) ; heads very numerous in compound flat corymbs ; scales of the involucre 

 rather closely imbricated, obtusish. — Moist thickets ; common, especially north- 

 ward. Aug. 



3. D. aniyg^ddlinus, Torr. & Gr. Smooth or roughish above, leafy ; 

 leaves ovate-lanceolate, acute, abruptly narrowed at the base ; scales of the involu- 

 cre loosely imbricated, obtuse. — Low grounds, New Jersey, Penu., and south- 

 ward. Aug. — Very near the last, usually lower, rougher, and with broader and 

 shorter leaves. 



4. D. COrnifoMuS, Darl. Stem (l°-2° high) pubescent, bearing few 

 heads on divergent peduncles ; leaves elliptical or ovate-lanceolate, conspicuously point- 

 ed at both ends, ciliate, hairy on the veins underneath. — Woodlands, E. Massa- 

 chusetts to Kentucky, and southward along the mountains. July- Sept. 



