1278 CARDUACEAE 



obovate, with three rounded lobes at the apex: chaff of the receptacle linear, acute: 

 achenes elliptic-oblong, 1.5-2 mm. long, bordered by a wing about one-third as broad as 

 the body : pappus a pair of blunt teeth. 



In pine lands, Louisiana. Summer and fall. 



20. Coreopsis similis F. E. Boynton. Annual, glabrous. Stems 1-3 dm. high, 

 grooved and striate, branched : leaves opposite, various ; blades of all but the upper ones 

 slender-petioled, tliose of the lower leaves either divided into ovate or elliptic-oblong seg- 

 ments (the terminal one the larger and often 1 cm. broad), or simple ; those of the upper 

 leaves with linear or linear-oblong segments: heads 2-2.5 cm. broad including the rays: 

 exterior involucral bracts subulate-lanceolate, about 2 mm. long, the inner ovate, about 5 

 mm. long : chaff of the receptacle linear, acute : ligules obovate, 3-lobed at the summit : 

 achenes orbicular, 2-2.5 mm. high, the wing as wide as the body : pappus a pair of slender 

 awns. 



In moist soil, Texas. Spring and summer. 



21. Coreopsis Leavenworthii T. & G. Annual, glabrous. Stems erect, 5-15 dm. 



high, terete, striate, branched, leafy throughout : leaves opposite ; the lower and middle 



stem-leaves with blades mostly divided into two or more narrowly linear segments, the 



upper mostly simple and very narrow : heads 2-3 cm. broad including the rays : exterior 



involucral bracts subulate-lanceolate, 1-2 mm. long, the inner ovate, 5-7 mm. long : ligules 



obovate, with three rounded lobes at tlie apex : chaff of the receptacle linear, acute : 



achenes roundish-oval, 2.5-3 mm. long, the wing as broad as the body : pappus a pair of 



erect, slender awns. 



In moist soil, Florida. Summer.— C. Lcavenworthii GdrbcriT. &G. A form with the divisions of 

 the leaf-blades much broader than the species. Possibly a distinct species. Florida. 



22. Coreopsis Levrtonii Small. Perennial, glabrous. Stems slender, erect or ascend- 

 ing, 3-5 dm. high, round, striate, branched at the base : leaves opposite, approximate below, 

 distant above ; blades linear or narrowly cuneate, 1-3 cm. long, simple and entire, longer 

 than the slender petioles: heads 2.5-3 cm. broad including the rays: exterior involucral 

 bracts ovate-lanceolate, 1-1.5 mm. long, obtuse, the inner oblong or oblong-lanceolate, 5- 

 6 mm. long : ligules obovate or broadly cuneate, 3-lobed at the apex, the middle lobe 

 notched : chaff of the receptacle linear, acute : achenes suborbicular, the wing as broad as 

 the body : pappus a pair of slender awns. 



In low, sandy soil, peninsular Florida. Summer. 



23. Coreopsis angustifolia Ait. Perennial, glabrous. Stems 5-7 dm. high, slender, 

 erect, branched above, more or less 4-angled. striate : leaves opposite or sometimes the 

 lower alternate, shorter or little longer than the internodes ; blades of the basal and lower 

 stem-leaves petioled, spatulate or oblanceolate, 4-9 mm. broad, rounded at the apex ; the 

 upper sessile, linear, much reduced in size, or the upper ones mere subulate scales : heads 

 2-3 cm. broad including the rays : outer involucral bracts ovate, rigid, 2-3 mm. long, the 

 inner ovate-lanceolate, 5-8 mm. long : ligules obovate, 3-lobed at the apex, the middle 

 lobe notched : chaff of the receptacle linear, acute : achenes broadly oval, 2.5-3 mm. long, 

 bordered by an irregularly lacerate wing : pappus a pair of slender awns. 



In wet soil, North Carolina to Florida. Summer and fall. 



24. Coreopsis longif olia Small. Perennial, glabrous. Stems 7-10 dm. high, erect, 

 simple or sparingly branched at the summit, round, striate-grooved : leaves alternate, the 

 basal and lower stem-leaves (including the petioles) much longer than the internodes, their 

 blades linear-oblong, linear-lanceolate or linear, 2-10 mm. broad, acutish, those of the 

 upper stem-leaves sessile, reduced to inconspicuous scales : heads 3-4 cm. broad including 

 the rays : outer involucral bracts lanceolate, 2-4 mm. long, the inner 2-3 times longer than 

 the outer, oblong-elliptic : ligules obovate, 3-lobed at the apex, the middle lobe rounded 

 or notched : chaff' of the receptacle linear, acute : achenes obovoid or spatulate in outline, 

 about 4 mm. long, bordered by a pectinate wing : pappus a pair of fugacious awns. 



In low grounds, southern Georgia and Florida. Fall. 



25. Coreopsis falc^ta F. E. Boynton. Perennial, glabrous. Stems 8-12 dm. high, 

 stout, erect, corymbosely branched near the summit, round, striate : leaves alternate, the 

 basal and lower stem-leaves with petioles 1-1.5 dm. long, their blades scythe-shaped, 1-1.5 

 dm. long, 1-2 cm. broad, tapering toward the apex, but terminating in an obtuse tip, 

 entire or with one or more narrow, ascending lobes ; blades of the upper stem-leaves nar- 

 rower, sessile, usually with two or more narrow, lateral lobes ; those of the branches re- 

 duced and scale-like : heads 3-5 cm. broad including the rays : outer involucral bracts 

 lanceolate, 5-7 mm. long, tlie inner about one-third longer than the outer, elliptic-oblong 

 to ovate : ligules obovate, 3-lobed, the middle lobe rounded or notched : chaff' of the recep- 

 tacle linear, acute : achenes oblong, nearly 5 mm. long, the broad wing cut into very fine 

 fringe-like segments : pappus a pair of awns less than 1 mm. long. 



In swamps, eastern North Carolina. Early summer. 



