COMPOSITE. (composite FAMILY.) 261 



involucre, linear, acute ; disk at length ovate or oblong ; acheuia with hairy 

 angles. — Low pine barrens, Florida to North Carolina. July -August. — 

 Stem 2° -3° high. 



66. HYMENOPAPPUS, L'Herit. 



Heads many-flowered ; the flowers all tubular and perfect. Scales of ths 

 involucre 6-12, oval or obovate, membranaceous, white. Keceptacle naked. 

 Corolla slender. Achenia top-shaped, 4-angled. Pappus of 12-20 short 

 obtiuse thii) scales. — Hoary or woolly herbs, with alternate pinuately lobed or 

 divided leaves. Heails corymbed. flowers commonly white. 



1. H, scabiosseus, L'Herit. Hoary-tomentose ; stem corymbosely 

 branched ; leaves pinnatifid or the lowest bipinnatifid, with lanceolate or 

 oblong divisions ; scales of the involucre broadly obovate, longer than the 

 disk ; pappus minute. — Liglit dry soil, Florida to South Carolina, and west- 

 ward. April -May. Stem 2^ high. 



67. POLYPTERIS, Nutt. 



Heads many-flowered ; the ray flowers pistillate, or none. Scales of the 

 obconical involucre in 2 rows, membranaceous at the summit. Throat of the 

 corolla shorter tliau the lobes. Eeceptacle flat, naked. Aclieuia slender, 4- 

 angled, tapering at the base. Pappus of 6 -12 membranaceous deuticulate 

 scales. — Herbs with narrow entire leaves, and heads of white or purple 

 flowers in a terminal corymb. 



1. P. integrifolia, Nutt. Stem (2° high) branched above, smoothish; 

 leaves lanceolate, rough, the lower ones often opposite ; rays none ; flowers 

 purijlish ; scales of the pappus 8-9, linear-subulate. — Dry pine barrens, 

 Georgia and Florida. July - Sept. 



68. PALAFOXIA, Lag. 



Heads of the involucre discoid. Scales of the involucre wholly herbaceous, 

 linear. Pappus of 4-8 scales. Throat of the corolla cylindrical, longer than 

 the lobes. Otherwise like the preceding. 



1. P. Feayi, Gray. Stem woody, slender, widely branched, rough with 

 short rigid hairs ; leaves ovate or lanceolate, opposite or alternate, short- 

 petioled ; corymbs loose ; heads discoid ; achenium sparsely hispid, several 

 times longer than the obtuse denticulate scales of the pappus. — South 

 Florida. Stem 3° - 5° high. 



69. FLAVERIA, Juss. 



Heads few-flowered, discoid, or with a single pistillate ray. Involucre of 

 3-5 oblong nearly equal scales. Receptacle naked. Achenia oblong or 

 club-shaped,- smooth, striate. Pappus none. — Tropical herbs, with opposite 

 leaves, and densely clustered heads of yellow flowers. 



1. F. linearis, Lagasca. Stem erect, or prostrate at the base, branched 

 above, smootliish ; leaves fleshy, linear, or linear-lanceolate, connate, entire ; 

 corymb dense ; scales of the involucre mostly 5 ; ray often wanting. — Coast 

 and Keys of South Florida. — Stem l°-2° high. 



