COMPOSITE. (COMPOSITE FAMILY.) 199 



7. E. strigdsum, Muhl. (DAISY FLEABANE.) Stem paniclcd-corym- 

 bose at the summit, ronghish 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. ERIGERfDIUM, Torr. & Gr. Rays about 30, in a single row, rather 

 broad: pappus simple : achenia mostly ^-nerved : not perennial. 



8. E. verimm, 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. nudicauie, Michx. Aster vemus, L.) Low 

 grounds, E. Virginia and southward. May. 



15. DIPJLOPAPPUS, Cass. DOUBLE-BRISTLED ASTER. 



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

 lucre imbricated, approved, narrow, 1-nerved or keeled, destitute of hei-baceous 

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

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

 the disk-corolla. Perennials with corymbose or simple heads : disk-flowers yel- 

 low; rays white or violet. (Name composed of SwrXoos, double, and TTUTTTJ-OS, 

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



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

 achenia silky: bristles of the inner pappus all alike. 



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

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

 strongly 1-nerved, smooth, with very rough margins. Dry soil; common. 

 Sept., Oct. 



$ 2. Rays white: heads small, corymbed: involucre shorter than the disk, imbricated 

 in about 3 rows : achenia smooth ish : bristles of the inner pappus unequal, some oj 

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



2. D. iiillbcllatus, Torr. & Gr. Smooth, leafy to the top (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. I>. amygd&linus, 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, Penn., and south 

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

 shorter leaves. 



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

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

 ed at both ends, ciliatc, hairy on the veins underneath. Woodlands, E. Masssv 

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



14 



