126 GAMOPETALOUS EXOGENS 



SUBTRIBE 1. ASTERIN'EAE. 



Heads mostly radiate, the disk-florets perfect, and the ray-florets pistillate; anthers 

 not tailed at base; receptacle not chaffy, mostly flat, and alveolate, or punctate. 



1. Rays never yellow. 



191. SERICOCAR'PIIS, Nees. 



[Or. serikos, silky, and Icarpos, fruit; descriptive of the akenes.] 

 Heads rather few-flowered ; rays about 5. Involucre oblong, or tur- 

 binate ; scales imbricated, whitish, with green subsquarrose tips. 

 Akenes short, inversely pyramidal, densely silky-pilose; pappus 

 simple, of roughish capillary bristles. Tufted yellowish-green pe- 

 rennials : leaves mostly sessile ; heads in small corymbose clusters ; 

 rays white. 



1. S. SOliclalgilieus, Nees. Stem angular, smooth; leaves sub- 

 linear, obtuse, entire ; involucre oblong ; pappus white. 



SOLIDAGO-LIKE SERICOCARPUS. 



Stem about 2 foot high, slender, nearly simple, or -with a few corymbose branches 

 at summit. Leaves 1 to 2 inches long, linear or spatulate-linear, obscurely punc- 

 tate and 3-nerved, smooth with the margin scabrous. Akenes clothed with hoary 

 shining silky-looking appresed hairs. 

 Hob. Moist woodlands : somewhat rare. Fl. Aug. Fr. Octo. 



2. S. COliyzoides, Nees. Stem terete, pubescent; leaves lance- 

 oval, rather acute, subserrate ; involucre turbinate ; pappus tawny- 

 ferruginous. 



CONYZA-LIKE SERICOOARPTTS. 



Stem 1 to 2 feet high, rather slender but rigid, smoothish, and often purple be- 

 low, corymbose at summit. Leaves 1 to 3 inches long, ciliate, the radical ones 

 tapering at base to a margined ciliate petiole nearly as long as the leaf. AJcenes 

 short, silky-villous. 

 Hob. Woodlands, and clearings: frequent. Fl. July. Fr. Sept. 



192. AS'TER, L. 



[Gr. Aster, a star; the radiated heads of flowers resembling stars.] 

 Heads many flowered; rays numerous in a single series. Involucre 

 sub-campanulate ; scales more or less imbricated, with herbaceous 

 or subfoliaceous tips. Akenes usually compressed, cuneate, pubes- 

 cent; pappus simple, scabrous. Mostly perennials: radical and 

 lower leaves often cordate at base ; heads of flowers corymbose, pan- 

 iculate, or racemose ; rays white, purple, violet, or blue. 



f Scale-tips appressed, slightly herbaceous ; rays white, or nearly so. 



1. A. corymb >SUS, Ait. Stem rather slender and flexuose, 

 smooth ; leaves cordate and ovate, acuminate, unequally and sharply 

 serrate, thin and smooth, on slender petioles ; corymb rather loose 

 and open, on slender dichotomous branches. 

 Eurybia corymbosa. Cassini, $ FL Cestr. ed. 2. p. 469. 

 CORYMBOSE ASTER. 



Stem about 2 feet high, branched at summit, often purple. Leaves 2 to 4 or 5 

 inches long ; petioles 1 to 2 inches in length, usually not margined. Heads of 

 flowers middle size, often few ; involucre smoothish. 

 Hob. Open woodlands : frequent. Fl. July. Fr. Sept. 



