402 ORDER LXVIII. COMPOSITE. 



1. G. polycepii'alum, (Midi.) 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. @. Sept. 

 — Oct. Very common. 1 — 2 feet. 



2. G. puupu'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. U. March — May. Common. 1 — 12 inches. 



Genus LXXIV.— ANTENNA'RIA. Ga3rt. 



(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. margakita'cea, (R. Br.) Stem erect, branching near the sum 

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

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

 ovate, obtuse, white scales. — Yellow. If. 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. If. Ma} T — June. Car. and Geo. 



Sub-tribe VIE- SENECIO'NE.<£. 



Heads homogamous or heterogamons, discoid or radiate ; 

 rays in a single series. Pappus capillary. 



Genus LXXV.— ERECHTI'TES. 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. Eeccjrfaclc naked. Achenia oblong, stri- 

 ate. Pappus setaceous, abundant Herbaceous plants, with 

 alternate simple leaves. 



1. I-], iiikkauio'i.ia, (Raf.) {Senecio hieracifolius, L.) Stem erect, 

 pubescent, branching toward the summit, succulent. Leaves alternate, 

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

 bescent. Flower* in compound terminal panicles; involucre with gla- 

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

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

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



