COMPOSITA. (COMPOSITE FAMILY.) 197 
18. 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. scandens, 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 minutely glandular. 
(M. pubescens, Muhl.) — Swamps, Florida and northward. Aug. and Sept: — 
Stem twining. 
14. CONOCLINIUM, DC. 
. Heade 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 petioled serrate leaves, 
and heads of purple or blue flowers in a terminal corymb. 
1. C. ecelestinum, DC. Smoothish; leaves deltoid-ovate, the lowest 
often cordate, acuminate, coarsely serrate; heads 30 — 60-flowered ; flowers blu- 
ish-purple. (Eupatorium coclestinum, L.) — Rich soil, Florida and northward. 
Sept. — Stem 2° high. 
Tring IIL ASTEROIDEJE. Heads discoid or radiate; the rays pistillate : 
branches of the style, in the perfect flower, Jlattened, linear or lanceolate, equally 
Pubescent above on the outside; the conspicuous stigmatic lines terminating where 
the exterior pubescence commences. 
15. SERICOCARPUS, Nees. 
Heads 12 - 15-flowered ; 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 in 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. par M 
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 er lanceolate and 
entire; involucre top-shaped ; pappus rust-color. (Aster conyzoides, Willd.) — 
gravelly or sandy soil, in the middle and upper districts, Georgia and north- _ 
Ward. August. — Stem 19 - 99 high. oo e MU. 
