COMPOSITE. (COMPOSITE FAMILY.) 261 



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

 ano-les. 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 the 

 involucre 6- 12, oval or obovate, membrauaceous, white. Receptacle naked. 

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

 obtuse thin scales. Hoarv or woolly herbs, with alternate piunately lobed or 

 divided leaves. Heads corymbed. Flowers commonly white. 



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

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

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

 disk; pappus minute. Light 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 

 obcouk-al involucre in 2 rows, membrauaceous at the summit. Throat of the 

 corolla shorter than the lobes. Receptacle flat, naked. Achenia slender, 4- 

 anu;k'd, tapering at the base. Pappus of 6 - 12 membranaceous denticulate 

 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 

 purplish; 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, smoothish ; 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 1- 2 high. 



