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 herbs, 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 ; 

 achcnia cuneiform, villous at the apex ; the callous margin tuberculate-rugose 

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

 ton. Introduced. Feb. - Mav. 



70. GNAPHALIUM, 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, appressed, 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. ( 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, (l) Stems 4' - 12' high. 



71. ANTENNARIA, Gsert. EVERLASTING. 



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

 cleft ; of the pistillate ones filiform. 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. margaritacea, 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' - 12' high. 



