250 COMPOSITE. (COMPOSITE FAMILY.) 



ing mostly winged achenia. Pappus of two persistent awns. Perennial 

 herbs, with lanceolate serrate often decurreut leaves. 1 lowers yellow or white. 



1. A. squarrosa, Xutt. Stein pubesceut, wiuged above; leaves alter- 

 nate or opposite, ovate lanceolate, acuminate at e;;ch end ; heads corymbose ; 

 scales of the involucre in 2 rows, liii ear-spat ulate, spreading ; acheuia broadly 

 obovate, winged ; awns of the pappus rigid, spreading ; rays 4- 12, yellow. 

 River banks, Florida to North Carolina. Sept. (Stem 4-b high. Lowest 

 leaves 1 long. 



2. A. alba, Torr. & Gray. Stem smooth, or pubescent and often slightly 

 winged above ; leaves alternate, lanceolate ; heads loosely corymbose; 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. 



60. 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 oppressed. Receptacle flat, chaffy. 

 Chaff membranaceous, mosUy deciduous with the acheuia. Achenia com- 

 pressed, often winged, not narrowed nor beaked at the apex, awnless, or with ;i 

 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. 



* HajS none. 



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

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

 the uppermost often simple ; heads small, on short peduncles ; exterior invo- 

 lucre foliaceoiis, longer than the heads ; achenia narrowly wedge-shaped, hnirv. 



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



* * liuys entire, or emiirt/iiittte at the ajie.r, i/f/low. 



*~ Leaves petiole d : ttrhenia narrowlj wetft/e-shctped, 2-toothed or aimed : sctiles 

 of the ini'olucre eijini/, the (inter ones se/>urate. 



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

 slightly pubescent, entire, or 3 - "-parted ; the divisions oblong or lanceolate, 

 serrate, toothed or lobed, or all linear and entire; exterior scales of the invo- 

 lucre linear-spatulate ; achenia smoothish, with two short triangular teeth 

 (C. mitis, Michx. C. arguta, Pnrsh.) Swamps. August -Oct. Stem 

 2-4 high. Leaves polymorphous; the uppermost commonly undivided 

 Rays showy. 



3. C. trichosperma, Michx. Smooth ; stem somewhat 4 angled, 

 branching; leaves pinnately 5-7-parted; the divisions lanceolate or linear, 

 sharply serrate or toothed ; the upper ones 3 - 5-cleft ; exterior scales of the 

 involucre linear, obtuse ; achenia hispid above, crowned with two triangular 

 hispid teeth. Swamps, South Can lina, and northward. Sept. Stem 1 

 2 high. Achenia twice as large as in the preceding. 



