comi'ositve. (composite iamii.y.) 233 



scales of the involucre in a single row, Iflnceokti&rabalate ; actaenia mostly 



broadly winged ; awns of the pappus slender; flowers white ; rays nunc. — Kith 

 soil, in the lower districts, Georgia and South Carolina, and westward, rare. 

 Sept. — Stem 4° - 8° high. Leaves 5' - 8' long. 



3. A. helianthoides, Nutt. Stem hirsute, strongly winged ; leaves alter- 

 nate, ovate-lanceolate, sessile, rough-hairy above, downy and hoary beneath ; 

 heads lew, corymbose; scales of the involucre in 2-3 rows, broadly lanceolate, 

 appressed ; rays 8-14, yellow; achenia slightly winged; awns bristle-like. — 

 Near Louisville, Georgia, and westward. July. — Stem 2° - 3° high. Leaves 

 3' long. Rays 1 £' long. 



4. A. nudicaulis, Nutt. Hirsute ; stem wingless, somewhat naked and 

 corymbose above ; leaves opposite, oblong, sessile, barely acute, the uppermost 

 small and mostly alternate ; heads corymbose ; scales of the involucre short, in 

 2-3 rows; rays 7-12, yellow ; achenia obovate-oblong, mostly wingless ; awns 

 short. (Helianthus 1 aristatus, Ell.) — Dry sandy woods, Georgia, Alabama, 

 and Florida. Aug. and Sept. — Stem 2° high. Leaves 2' -3' long. 



* * Stems low, simple : pappus obsolete : rays none. 



5. A. pauciflora, Nutt. Stem wingless, simple, smooth below, naked and 

 rough above ; leaves opposite or alternate, lanceolate or elliptical, sessile, rigid, 

 obtuse, strongly reticulate, rough with short rigid hairs ; heads solitary or 2-3 

 together, terminal ; scales of the involucre in 2 rows, lanceolate, appressed ; 

 flowers orange-yellow ; the marginal ones abortive ; achenia oblong-obovate, 

 narrowly winged, with a cup-shaped disk ; pappus wanting. — Low pine barrens 

 near the coast, West Florida. June and July. — Stem l°-2° high. Leaves 2' 

 long. Involucre, chaff, and achenia dark brown. 



50. COREOPSIS, L. Tickseed. 



Heads many-flowered ; the ray -flowers commonly 8, neutral, rarely wanting. 

 Involucre double ; each row of about 8 scales ; the outer ones narrow and 

 spreading ; the inner membranaceous and appressed. Receptacle flat, chaffy. 

 Chaff membranaceous, mostly deciduous with the achenia. Achenia compressed, 

 often winged, not narrowed nor beaked at the apex, awnless, or with a pappus 

 of two upwardly hispid or serrulate awns or scales. — Herbs. Leaves entire or 

 pinnately divided. Heads solitary or corymbose. Disk dark purple or yellow. 

 Rays yellow, rarely rose-color. 



* Rays none. 



1 C. discoidea, Torr. & Gray. Smooth ; stem diffusely branched ; leaves 

 long-petioled, 3-parted, with ovate-lanceolate coarsely serrate divisions ; the up- 

 permost often simple ; heads small, on short peduncles ; exterior involucre folia- 

 ceous, longer than the heads ; achenia narrowly wedge-shaped, hairy. — Swamps, 

 North Carolina, and northward. July- Sept. — Stem l°-2° high. 



* * Rays entire, or emaryinate at the apex, yellow. 



•*- Leaves petioled : achenia narrowly w< dye-shaped, 2-toothed or awned : scales of the 

 involucre equal, the outer ones separate. 

 2. C. aurea, Ait. Stem smooth, much branched ; leaves smooth or slight- 

 ly pubescent, 5 - 7-parted ; the divisions oblong or lanceolate, senate, toothed or 

 20* 



