COMPOSITE. (composite FAMILY.) 243 



Scales of the involucre 5 - 10, in a single row. Receptacle flat, naked. Ache- 

 nia compressed, with winged or thickened margins, armed with the persistent 

 rigid style. Pappus none. — Small depressed lierbs, with petioled pinnately 

 divided leaves, and small sessile or rarely pedunculate heads. 



1. S. nasturtiifolia, DC. Very low and depressed ; leaves on short peti- 

 oles, pinnately parted ; the lobes 3-4 on each side, obtuse, entire; heads sessile; 

 achenia cuneifonn, villous at the apex ; the callous margin tuberculate-rugose 

 throughout. ( Gymnostylis stolonifera, Nutt.) — South Carolina, around Charles- 

 ton. Introduced. Feb. - May. 



70. GWAPHALIITM, L. Everlasting. 



Heads many-flowered, discoid ; exterior and pistillate flowers very slender, 

 mostly in several rows ; the central ones perfect. Scales of the involucre im- 

 bricated, apprested, scarious. Receptacle flat, naked. Achenia terete or more 

 or less flattened. Pappus a single row of capillary bristles.^Woolly or downy 

 herbs. Leaves alternate, undivided. Heads in crowded spikes or corymbs. In- 

 volucre colored. 



1 • G. polycephalum, Michx. Stem woolly, white, branching above ; 

 leaves linear, sessile, undulate, white beneath ; heads corymbose ; scales of the 

 involucre white, obtuse. — Old fields, common. Sept. and Oct. Q} — Stem 2° 

 high. Perfect flowers few. 



2. G. purpureum, L. Woolly or tomentose and hoary throughout ; 

 stems branching at the base, ascending, simple ; lowest leaves spatulate-lanceo- 

 late, the upper ones linear ; heads in crowded spikes. — Cultivated ground, 

 very common. April -June. (J) — Stems 4' - 12' high. 



71. ANTENNABIA, Gaert. Eveklasting. 



Heads many-flowered, dicecious, discoid ; the corolla of the sterile flowers 5- 

 cleft ; of the pistillate ones filifonn. Scales of the involucre imbricated, scarious, 

 colored. Receptacle convex or flat. Achenia nearly terete. Pappus a single 

 row of capillary bristles, which, in the staminate flowers, are thickened at the 

 apex — Perennial downy or woolly herbs, with alternate entire leaves, and 

 corymbose rarely single heads. 



1. A. margaritaeea, R Br. Stem corymbose above, woolly; leaves 

 linear-lanceolate, with revolute margins, tomentose ; heads corymbose ; invo- 

 lucre white. — Upper districts of North Carolina, and northward. Sept. and 

 Oct. — Stem 1° - 2° high. 



2. A. plantaginifolia, Hook. Stoloniferous ; stems scape-like ; radical 

 leaves spatulate or obovate, hoary, becoming smooth above, 3-ribbed ; those of 

 the stem few, linear or lanceolate ; heads small, in a terminal cluster, sometimes 

 single and larger ; involucre white or purplish. — Sterile soil, Florida, and north- 

 ward. March - May. — Stem 6' - 1 2' high, 



