COMPOSITE. (composite FAMILY.) 197 



13. MIKANIA, Willd. 



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

 partly cxserted. Corolla, achenia, &c. as in Eupatorium. — Ciiicfly climbing 

 herbs, with oi)posite mostly cordate leaves, and wiiitish flowers. 



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

 oles, aouminatc, tootiied or entire ; corymbs numerous, on short axillary branches 

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

 (M. pubesccns, 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. Kcceptacle conical, naked. Corolla 5-toothed. Anthers included. 

 Achenia angled, smooth. — Perennial herbs, with opposite petioled seiTato leaves, 

 and heads of i)uri)le 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 coelestinum, L.) — Kich soil, Florida and northward. 

 Sept. — Stem 2° high. 



Tribe III. ASTEROIDE^. Headu discoid or radiate; the raijs pistillate: 

 branchfs of the stijle, in the perfect flower, flattened, linear or lanceolate, equally 

 pubescent above on the outside ; the conspicuous sti<jmalic lines terminatimj xvhcre 

 the exterior pubescence commences. 



15. SERICOCARPUS, Nces. 



Heads 1 2 - 1 r)-flowcred ; the ray-flowers about 5, white, pistillate ; those of the 

 disk tubuLir 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. 



1. S. COnyzoid.es, 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 ©r lanceolate and 

 entire ; involucre top-shaped ; pappus rust-color. (Aster cony/oidcs, 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 solidaginoidcs, Willd.) — Low ground in the upper districts. August. — 

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



17* 



