COMPOSITE. (COMPOSITE FAMILY.) 239 



31. ANTENNARIA, Gtert. EVERLASTING. 



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

 5 -cleft; of the pistillate filiform. Scales of the involucre scarious, colored. 

 Receptacle convex or flat. Acheiiia nearly terete. Pappus a single row of 

 capillary bristles, which, in the stamiuate flowers, are thickened at the apex. 

 Perennial downy or woolly herbs, with alternate entire leaves, and corym- 

 bose 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 Korth Carolina, and northward. Sept. - 

 Oct. Stem l-2high. 



2. A. plantaginifolia, Hook. Stolouiferous ; 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, some- 

 times single and larger ; involucre white or purplish. Sterile soil, Florida, 

 and northward. March- May. Stem 6' - 12' high. 



32. GNAPHALIUM, L. EVERLASTING. 



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

 mostly in several rows ; the central perfect. Scales of the involucre appressed, 

 scarious. Eeceptacle flat, naked. Achenia terete or more or less flattened. 

 Pappus a single row of capillary bristles. Woolly or downy herbs. Leaves 

 alternate. Heads in crowded spikes or corymbs. Involucre colored. 



1. G. polycephalum, Michx. Stem woolly or villous, sometimes 

 viscid, white, branching above ; leaves linear, sessile, undulate, white beneath ; 

 heads corymbose ; scales of the involucre white, obtuse. Old fields and open 

 woods, common. Sept. -Oct. (T) 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- 

 lanceolate, the upper linear ; heads in crowded spikes. Cultivated ground, 

 very common. April - June. Stems 4' - 12' high. 



33. PILAGO, L. CUDWEED. 



Heads discoid, many-flowered ; the central flowers perfect, but often abor- 

 tive, the outer ones very slender and pistillate. Involucre of few woolly 

 scales. Lower part of the long or top-shaped receptacle chaffy, the upper 

 part naked. Pappus of the perfect flowers capillary, of the pistillate none. 

 Low woolly annuals. 



1- F. Germanica, L. Stem forking; leaves lanceolate, entire; scales 

 of the involucre and chaff cuspidate. Waste ground. Introduced. 



TRIBE IV. SENECIONIDE J5. Heads discoid or radiate ; branches of the 



sti/Ie, in tJie perfect flowers, /inrar, convex exfernal/i/, Jiain/ or brush-shaped 

 at the apex, and truncate, or produced info a con'ra! or hispid appendage ; 

 the stiff mafic lines terminating at the appendage, not confluent. 



