Coreopsis. COMPOSITE. 341 



Arkansas, Nuttall ! 'Dr. Pitcher! — Fruit unknown. The plant entirely 

 resembles C. aristosa, excepting the outer involucre, and the short teeth of 

 the ovary. 



* * Achenda obovate-oblong, unnglcss, ohsolddy 2-toothcd at the summit : inrclucre near- 

 ly as in Chrysostemma ; the scales scarcely united : rays entire : appendages of the 

 style ovate-triangular, with a short point : leaves opposite, ample, undivided, serrate, 

 copiously feather-veined. — Silphidium. 



7. C. latifolia (Michx.) : very smooth and glabrous ; stem lall ; leaves 

 membranaceous, ovate or ovate-oblong, acuminate, irregularly dentate-ser- 

 rate, with the teeth mucronafe, abruptlj' conirncted into short petioles, pale 

 beneath; heads in small irichotomous corymbs; scales of the involucre 4-5 

 in each series; the exterior linear, spreading. — Michx. ! fl. 2. p. 137. 



High mountains of Carolina, Michaux! Mountains of Georgia and North 

 Carolina, Mr. Buckley ! Aug. — Lower leaves often 6 inches long and 4 

 broad. Heads small for the size of the plant : rays 5 or 6, large. Cliaff ob- 

 long-linear. Corolla yellow. Anthers long, black. Mature achenia un- 

 known : the flat ovaries are obscurely margined. 



* * * Achenia elliptical, narrowly winged and somewhat incurved ivhen mature, emar- 

 ginate : the summit of the wing and the narroio emargination denticulate-lacerate : 

 chaff n£arly filiform, someiohat deciduous: scales of the exterior involucre linear, ob- 

 tuse, foliaceous, spreading, as many as the interior (6-8) hut muck smaller, all united 

 at the base: rays obtuse, entire: corolla of the dish yelloiv, turning brownish: leaves 

 opposite, petioled, 3-divided, or the lowest pinnately 5-divided ; the divisions entire, 

 feather-veined: heads somewhat corymbose, exhaling the anisate odor of Lepachys 

 when bruised! — Chiysostemma, Less. 



8. C. tripteris (Linn.) : smooth and glabrous; stem tall, simple, or corym- 

 bose above; divisions of tlie leaves lanceolate, acute, with very scabrous 

 margins, and with an obscure marginal nerve ; heads on short peduncles. — 

 Linn.! spec. 2. p. 908; Michx. !% 2. p. 138; Willd.! spec. 3. p. 2253; 

 Ell. sk. 2. ]}. 442. Anacis tripteris, Schrank. Chrysostemma tripteris, 

 Less.! syn. p. 227; DC! prodr. 5. p. 568; Hook. hot. mag. t. 3553. 



/?. leaves minutely scabrous-puberulent. 



Dry soil, and near streams, Michigan! and Missouri! to Florida! and 

 Louisiana! /:(. Western Louisiana, £>r. Frate/;/ Aug.-Oct. — 11 Stem 4-8 

 feet high. Heads including the spreading rays an inch or more in diame- 

 ter. — The denticulate fringe at the summit of the achenia is nearly confined 

 to the wing, so that the pappus can scarcely be called coroniform. The 

 style is nearly as in C. senifblia, delphinifolia, &c., in which species, more- 

 over, the summit of the wing is more or less denticulate. 



* * * * Achenia oblojig, narrowly winged , straight or a littk incurved, minutely 2-toothed 

 or nearly naked and truncate at the summit: chaff linear filiform , persistent: scales of 

 the exterior involucre oblong-linear, obtuse, about the length of the interior, all united 

 at the base : rays usually acute and entire : leaves opposite, sessile, mostly 3-divided, so 

 that each pair resembles a whorl of six ; the divisions entire or lobed, never serrate, 

 1-nerved. — Gyrophyllum. (Eucoreopsis & Gyrophyllum, Nutt., excl. spec.) 



9. C. senifolia (Michx.): softly and minutely puberulent ; stem quadran- 

 gular below ; leaves closely sessile, 3-divided ; the divisions oval-lanceolate, 

 membranaceous, 1-nerved, obscurely veined, entire, scarcely acuminate; 



