880 ORDER LXVin. — COMPOSITJS, 



Eessile. Flowers on long peduncles, in pairs; involucre with ovate, acu- 

 minate leaves. — White. ©. June — July. Gravelly soils. 



2. E. procum'bens. Sle^n procumbent, assurgent, terete, with numer- 

 ous opposite branches, with appressed hairs. Leaves sessile, opposite, 

 lanceolate, narrowed at the base, 3-nerved ; involucre with acute lance- 

 olate leaves. Flowers on peduncles, generally in pairs ; involucre with 

 8 — 10 leaves, lanceolate, ciliate, unequal ; ray florets numerous, 2 

 toothed. — White. ©. June — Oct. Damp soils. Common. 12 — 18 

 inches. 



3. E. brachtpo'da. Stetn prostrate, divaricately branched. Leaves 

 lanceolate, slightly serrulate. Flowers on short peduncles, solitaiy or 

 in pairs ; involucre with oval lanceolate leaves ; florets 4 — 5-cleft. — 

 White. ®. July — Sept. Sandy soils. 



Tribe IV.-SENECIOrDEJS. 



St^le cylindrical at the apex ; in perfect flowers bifid, branch- 

 es elongated, linear, pencillate, or truncate at the apex ; pro- 

 duced beyond the pencil into a short cone, or an elongated ap- 

 pendix, narrow and hispid. Corolla of the disk regulai-, pellucid. 



Genus XXXIII.— POLYM'NIA. L. 



(Named from one of the Muses.) 



Involucre double, the exterior usually 5-leaved, the interior 

 lU-leaved. Ray florets pistillate, those of the disk staminate. 

 Rccejitacle chaffy. Pappus none. 



1. P. Canaden'sis, (L.) Stem erect, viscid, villous, somewhat scabrous. 

 Lower leaves deeply lobed, or pinnatifid, the \ipper ones entire or 3- 

 lobed, all finely serrate, somewhat ovate, slightly scabrous. Flowers 

 in terminal panicles; involucre viscid and villous; ray florets 10, small. 

 — Yellow. IX. July — Sept. Mountains. 2- — 4 feet. 



2. P. Uveda'lia, (L). Stem erect, villous, terete, scabrous. Leaves 

 opposite, 3 — 5-lobed or ternate ; leaflets or lobes tomentose, ovate, sca- 

 brous, petiole winged. Flowers in a terminal panicle, with oj^posite or 

 ternate branches ; involucre with the exterior scales largest, eiliate, 

 ovate; the interior lanceolate, villous; ray florets 10, 3 toothed at the 

 summit. Seeds globose, somewhat compressed, glabrous. — Yellow. If. 

 June — A.ug. Common. 3 — 5 feet. 



Genus XXXIV.— CHRYSOG'OXUM. L. 

 (From cn7'usos, golden, and grow?, joint, the flowers being at the joint.) 



Involucre 5-Ieaved, oblong, villous. Ray florets pistillate, 

 those of the disk staminate. Hecejjtacle chaffy. Seed enfolded 

 in a 4-leaved calyx. Pappus 1-leaved, pubescent at the summit. 



1. C. Virginia'num, (L.) Stem decumbent, villous. Leaves opposite, 



oblong, lanceolate-oval, crenately dentate, attenuate at the base into a 



long petiole, villous. Flowers solitary; involucre villous; ray florets 



o, broad. /S(?ec?s compressed, somewliat pubescent. — Yellow. 2^. April 



-June. Common. 4 — 12 inches. 



