362 ORDER Lxvni. COMPOSITE. 



the scale imbricate. Receptacle alveolate. Corolla of the disk 

 deeply 5-cleft. Achenia hirsute or villous. Pappus setaceous, 

 in many series. Herbaceous plants, with alternate, entire leaves, 

 and fastigiate branches. 



1. G. hyssopifo'lia, (Nees.) Stem erect, glabrous, striate, with fasti- 

 giate branches. Leaves linear-lanceolate, 3-nerved, acute, with scabrous 

 margins. Flowers in terminal fastigiate corymbs ; involucre ovate, the 

 interior scales obtuse, the exterior acute, florets of the ray from 3 — 10. 

 — White, tinged with purple. 7±. Aug. — Oct. Common. Middle 

 Car. and Geo. 1 — 2 feet. 



Genus XV.— SERICOCAR'PUS. Nees. {Aster solidaginoides, Mich, 

 A. conyzoides, Willd., A. tortifolius, Mich.) 



(From serikos, silky, and karpos, fruit) 



Involucre obovate, oblong, with scales in several series, the 

 tips herbaceous and spreading. Receptacle alveolate. Achenia 

 obpyramidal, short, densely silky. Pappus simple, rigid. Her- 

 baceous plants, with alternate sessile leaves, and corymbose 

 flowers and branches, and white flowers. 



1. S. solidagin'zus, (Nees.) Stem glabrous, slightly angled. Leaves 

 linear-lanceolate, sessile, entire, scabrous on the margin. Flowers sessile, 

 in small clusters on corymbose fastigiate branches ; involucre cylindrical, 

 with obtuse reflexed scales. Seeds oblong, silky, pubescent, angled. — 

 White. 2£. July — September. Rich soils. Common. 



2. S. conyzoi'des, (Nees.) Stem simple, striate, slightly pubescent, 

 or somewhat rigid. Leaves sessile, the lower ones cuneate-lanceolate, 

 serrate, ciliate, and scabrous along the margins, upper ones entire, 

 lanceolate. Flowers in sessile clusters, on fastigiate corymbose branch- 

 es ; involucre cylindrical, with oblong ciliate scales; ray florets some- 

 times 6, 2 — 3-cleft at the summit. Seeds villous; pappus scabrous. — 

 White, tinged with purple. If. June — Aug. Middle upper dist. 

 Car. and Geo. 



3. S. toktifo'lius, (Nees.) Stem pubescent, branching toward the 

 summit. Leaves sessile, tortuous, obovate, acute or obtuse, entire, pu- 

 bescent. Flowers hi sessile clusters, on fastigiate corymbose branches ; 

 involucre cylindrical, with appresyed linear-lanceolate scales ; ray flo- 

 rets 2-cleft. Seeds oblong, pubescent. — White. U. Low country. 

 2 feet. 



Gencs XVI.— ASTER. L. 



(From aster, a star.) 



Involucre imbricate, with the lower scales generally expand- 

 ing, florets of the ray usually more than 10, never yellow; 

 those of the disk hispid. Receptacle naked; pappus simple, 

 pilose. 



a. Leaves entire, fiords of the ray generally numerous. Seeds silky, 



pubcv, nt. 



1 A. flf.xuo'si>, (Mich.) St',, procumbent, assurgent, glabrous. 

 Leaves subulate, linear, sessile, 3-neive.l. somewhat fleshy, very long. 



