358 FLORA OF TEXAS. 



ones very slender, mostly in several rows, the central ones 

 perfect ; scales of the involucre imbricated, appressed, sca- 

 rious; receptacle flat, naked; acheuia terete or more or 

 less flattened ; impjpus a single row of capillary bristles. — 

 Woolly or downy lierljs ; leaves alternate, undivided ; 

 heads in crowded spikes or corymbs ; involucre colored. 



G. POLYCEPHALUM, Mlchx. Stem woolly, white, branch- 

 ing above; leaves linear, sessile, undulate, white beneath; 

 heads corymbose ; scales of the involucre white, obtuse. 

 Stem 2° high ; ^QYiQct flowers few. 



G. PURPUREUM, L. AVoolly or tomentose and hoary 

 throughout ; stems branching at the base, ascending simple ; 

 lowest Zeai'<?.s spatulate-lanceolate, the upper ones linear; 

 heads in crowded spikes. Stems 4'-12' high. 



ANTENNARIA, G^ert Everlasting. 



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

 the sterile /ozi;er5 5-cleft, of the pistillate ones filiform; 

 scales of the involucre imbricated, scarious, colored ; recep- 

 tacle convex or flat ; achenia nearly terete ; ptf^^ppus a single 

 row of capillary bristles, which, in the staminate flowers, 

 are thickened at the apex. — Perennial downy or Avoolly 

 herhs, with alternate entire leaves, and corymbose rarely 

 single heads. 



A. MARGARITACEA, R. Br. Stem corymbose above, 

 woolly; leaves linear-lanceolate, with revolnte margins, 

 tomentose ; heads corymbose ; involucre white. Stem 

 l°-2° high. 



A. PLAXTAGixiFOLiA, 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. Stem 

 6'-l2' high. 



