402 ORDER LXVm. — COMPOSITE. 



1. G. polyceph' alum, (Mich.) Stem erect, branching toward the sum- 

 mit, white, tomentose. Leaves sessile, linear-lanceolate, slightly un- 

 dulate, glabrous above, tomentose and white beneath. Flowers in ter- 

 minal corymbs ; involucre conical, leaflets oblong, tomentose at the 

 base. Seeds cylindrical glabrous ; pappus pilose. — "White. 0. Sept. 

 — Oct. Very common. 1 — 2 feet. 



2. G. purpu'reum, (L.) Stem erect or decumbent, simple, tomentose. 

 Leaves linear-spatulate, tomentose beneath, slightly mucronate, undu- 

 late. Flowers in sessile, axillary clusters ; involucre with the leaflets 

 ovate, glabrous, inner ones tinged with purple. Seed oblong, scabrous. 

 .—Purple. If. March — May. Common. 1 — 12 inches. 



Genus LXXIV.— ANTENNA' RI A. Gasrt. 

 (From the resemblance of the pappus to the antenna of insects.) 



Involucre many-leaved, imbricate ; scales oblong, scarious, 

 colored. Flowers dioecious. Seeds glabrous. Pappus plu- 

 mose. Receptacle naked. 



1. A. margarita'cea, (R. Br.) Stem erect, branching near the sum 

 mit. Leaves linear-lanceolate, tapering, acute, tomentose beneath, 

 entire. Flowers in fastigiate corymbs ; involucre many-leaved, with 

 ovate, obtuse, white scales. — Yellow. 2£. Aug. — Sept. Mountains. 

 1—2 feet. 



2. A. plantaginifo'lia, (Hook.) Stem simple, with procumbent shoots, 

 white, tomentose. Radical leaves spatulate, ovate, entire, nerved, to- 

 mentose beneath; cauline ones spatulate, lanceolate. Flowers in small, 

 terminal corymbs ; involucre with the inner scales long, obtuse, colored. 

 — Reddish- white. 2£. May — June. Car. and Geo. 



Sub-tribe VIII.— SENECIO'NEJB. 



Heads homogamous or heterogaraous, discoid or radiate; 

 rays in a single series. Pappus capillary. 



Genus LXXV.— ERECH'TITES. Raf. 

 (Probably named after Erectheus.) 



Heads many-flowered, discoid, with the marginal flowers pis- 

 tillate, the center ones perfect. Involucre cylindrical. Scales 

 in one series, linear. Receptacle naked. Achenia oblong, stri- 

 ate. Pappus setaceous, abundant. Herbaceous plants, with 

 alternate simple leaves. 



1. E. hieracifo'lia, (Raf.) (Senecio hieracifolius, L.) Stem erect, 

 p-ibescent, branching toward the summit, succulent. Leaves alternate, 

 oblong, sessile, unequally notched, or pinnatifid, with acute lobes, gla- 

 brous. Flowers in compound terminal panicles ; involucre with gla- 

 brous leaves, ventricose, with irregular setaceous leaflets at the base. 

 Seeds slightly pubescent ; pappus bristly. — Yellowish-white. 0. June 

 — Sept Rich soils. Middle Geo. 4 — 8 feet Fire-weed, 



