'3f>2 ORDKR LXVIII.— COMPOSITE. 



the scale imbricate. Receptacle alveolate. Corolla of the disk 

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

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

 and fastigiate branches. 



1. G. uyssopifo'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, 

 — Wliito, tinged with purple. U. Aug. — Oct. Common. Middle 

 Car. and Geo. 1—2 feet. 



Genus XV.— SERICOCARTUS. Nees. {Aster soUdagiywide^, Mich., 

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



(From seri^os, 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'eus, (Nees.) Stetn glabrous, slightly angled. Leaves 

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

 in small clusters on corymbose fastigiate branches ; involucre cylindrical, 

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

 White, li. July — September. Rich soils. Common. 



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

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

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

 lanceolate. Flowers in sessile clusters, on fastigiate corymbose bi-anoh- 

 es ; involucre cylindrical, with oblong eiliate 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. 



8. S. tortifo'lius, (Nees.) Stem pubescent, branching toward the 

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

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

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

 rets 2-Cieft. Seeds oblong, pubescent. — White. 2f. Low country. 

 2 feet. 



Genls XVI.— AS'TER. 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, florets of the ray generally niiynerous. Seed'i silky, 

 pubescent, 



1 A. FLExuo'sus, (Mich.) Steiv procumbent, assuj-gent, glabrous. 

 Leaves subulate, linear, sessile, S-nerved, somewhat fleshy, very long. 



