COMPOSIT^E. (COMPOSITK FAMILY.) 197 



13. MIKANIA, Willd. 



Heiids 4-flowercd. 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, MuM.) — 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 petioled serrate leaves, 

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



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

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

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

 Sept. — Stem 2° high. 



Trip,e III. ASTEROIDEiE. Heads discoid or radiate; the rays pistillate: 

 branches of the style, in the perfect Jloiver, flattened, linear or lanceolate, equaUij 

 pubescent above on the outside ; the conspicuous stiymatic lines terminatiny ivhere 

 the exterior pubescence commences. 



15. SERICOCARPUS, Nces. 



Heads 12 - 1.5-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 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 jellow. 



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 conyzoidcs, Willd.) — 

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

 ward. August. — Stem lo-2° high. 



2. S. SOlidaglneUS, 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* 



