ORDER LXVIII. — COMPOSITE. 401 



Genus LXX.— TANACE'TUM. L. 



(Name uncertain, said to be altered from Athanasia.) 



Heads discoid, homogamous ; florets tubular and perfect, or 

 heterogamous, with the lateral ones pistillate. Receptacle naked, 

 convex. Achenia glabrous, angled. 



1. T. vulga're, (L.) Stem erect, glabrous, suffructicose. Leaves bi- 

 pinnately divided, incisely serrate. Heads in corymbs. — Yellow. June 

 — Aug. Naturalized. Tansey. 



Genus LXXI.— ARTEMI'SIA. L. 



(Dedicated to the goddess Artemis.) 



Involucre imbricate, with the leaves round, connivent ; ray 

 florets none. Receptacle naked. Pappus none. 



1. A. cauda'ta, (Mich.) Stem erect, simple, glabrous, paniculately 

 branched. Radical and lower cauline leaves sub-bipinnate, pubescent ; 

 upper ones sub-pinnate ; segments sub-setaceous, convex, alternate, di- 

 varicate. Flowers erect, pedicillate, globose, in dense 'panicle?. — Yel- 

 low. 2£. July — Aug. On the sea-shore. 2 — 6 feet. Wormwood. 



Genus LXXI I.— SOL' I VA. Ruiz & Pa v. 

 (In honor of Salvator Soliva.) 



Involucre many-leaved. Flowers of the circumference sterile, 

 of the center fertile ; fertile flowers apetalous. Stamens none ; 

 sterile florets with the corolla funnel-shaped, slender. Seeds 

 compressed. Pappus a winged margin, toothed. Receptacle 

 naked. Gimnostyles. 



1. G. stolonif'era, (Nutt.) Stem glabrous, creeping. Leaves pin- 

 natifid, with linear and sometimes toothed segments, somewhat succu- 

 lent, sprinkled with a soft pubescence, tapering into a long base, all 

 radical. Flowers sessile at the root ; involucre with oblong, hairy leaf- 

 lets, in a single series. Seed terminated by the persistent style, en- 

 larged at the summit. — 2£. Feb. — May. Damp soils. Low country. 



Sub-tribe VII.— GNAPHA'LE^E. 



Heads discoid, homogamous or heterogamous ; florets all tu- 

 bular. Pappus capillary or setaceous, sometimes none. 



Genus LXXIIL— GNAPHA'LIUM. L. 

 (From gnaphalon, soft down.) 



Involucre imbricate, with scales oblong, membranaceous, 

 usually colored. Pistillate and perfect florets intermingled. 

 Pistillate florets slender, 5-toothed. Stamens none. Perfect 

 florets, stamens as long as the corolla. Seeds glabrous ; pappus 

 pilose. Receptacle naked. 



