COMPOSITE. (COMPOSITE FAMILY.) 233 



scales of the involucre in a single row, lanceolate-subulate ; achenia mostly 

 broadly winged ; awns of the pappus slender ; flowers white ; rays none. Rich 

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

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



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

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

 heads few, 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 l' 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 ? 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 1 -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. 



* Pays 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 1 - 2 high. 



* * Rays entire, or emarginate at the apex, yelloiv. 



- Leaves petioled: achenia narrowly wedge-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, serrate, toothed or 



20* 



