COMPOSITE, (composite family.) 197 



13. MIKANIA, Willd. 



Heads 4-flowered. Scales of the involucre 4. Receptacle naked, flat. Anthers 

 partly exserted. Corolla, achenia, &c. as in Eupatorium. — Chiefly climbing 

 herbs, with opposite mostly cordate leaves, and whitish flowers. 



1 . M. scaudens, Willd. Smooth or pubescent ; leaves on slender peti- 

 oles, acuminate, toothed or entire ; corymbs numerous, on short axillary branches 

 or peduncles ; scales of the involucre linear, acute; achenia minntely glandular. 

 (M. pubescens, Mahl.) — Swamps, Florida and northward. Aug. and Sept. ^ 

 Stem twining. 



14. CONOCLINIUM, DC. 



Heads many-flowered. Scales of the involucre nearly equal, imbricated in 

 2-3 rows. Receptacle conical, naked. Corolla 5-toothed. Anthers included. 

 Achenia angled, smooth. — Perennial herbs, with opposite petiolcd serrate leaves, 

 and heads of purple or blue flowers in a terminal corymb. 



1. C. ccelestinum, DC. Smoothish; leaves deltoid-ovate, the lowest 

 often cordate, acuminate, coarsely serrate ; heads 30 - 60-flowered ; flowers blu- 

 ish-purple. (Eupatorium ccelestinum, L.) — Rich soil, Florida and northward. 

 Sept. — Stem 2° high. 



Tribe III. ASTEROIDEjE. Heads discoid or radiate; the rays pistillate! 

 branches of the style, in the perfect flower, flattened, linear or lanceolate, equally 

 pubescent above on the outside ; the conspicuous stigmatic lines terminating where 

 the exterior pubescence commences. 



15. SERICOCABPUS, Nccs. 



Heads 12 - lj5-flowcred ; the ray-flowers about 5, white, pistillate ; those of the 

 disk tubular and perfect. Involucre somewhat cylindrical or club-shaped ; the 

 scales cartilaginous, whitish, closely imbricated ii^ several rows, with greenish 

 and more or less spreading tips. Receptacle pitted, toothed. Achenia short, 

 obpyramidal, silky. Pappus simple, composed of numerous capillary bristles. 

 — Perennial herbs. Leaves alternate. Heads crowded in a dense corymb. 

 Disk-flowers yellow. 



1. S. conyzoides, Nees. Stem slightly pubescent, corymbose above; 

 nearly terete ; leaves ciliate on the margins, otherwise smooth, the lower ones 

 spatulate-oblong, serrate above the middle, the upper oblong or lanceolate and 

 entire ; involucre top-shaped ; pappus rust-color. (Aster conyzoides, Willd.) — 

 Dry gravelly or sandy soil, in the middle and upper districts, Georgia and north- 

 ward. August. — Stem 1 ° - 2° high. 



2. S. SOlidagineus, Nees. Smooth ; stem angled ; leaves lanceolate or 

 linear, obtuse, entire, the lowest spatulate ; involucre top-shaped ; pappus white. 

 (Aster solidaginoides, Willd.) — Low ground in the upper districts. August. — 

 Stem slender, 2° high. Heads smaller than in the last. 



17* 



