CARDUACEAE 1277 



13. Coreopsis piilchra F. E. Boynton. Perennial. Steins erect, glabrous, 4-7 dm. 

 high, striate, round or slightly angled and branched above, very leafy : leaves opposite ; 

 blades palmately divided into linear segments, which are again subdivided, and appearing 

 fascicled : internodes mostly shorter than the leaves : heads 3-4 cm. broad including the 

 rays : outer involucral bracts linear, obtuse, 5-6 mm. long, the inner ovate, slightly longer 

 than the outer : ligules elliptic-oblong, entire or slightly notched at the apex : chaff of the 

 receptacle linear or with slightly dilated tips : achenes oblong-obovate, about 4 mm. long, 

 narrowly winged : pappus a minute lacerate border. 



In rocky woodlands, northern Alabama. Summer. 



14. Coreopsis latifolia Michx. Perennial. Stems 1-1.5 m. high, slender, erect, 

 branched near the summit, round, striate, pubescent or glabrate, leafy : leaves opposite ; 

 blades short-petioled, membranous, ovate to ovate-lanceolate, acuminate, cuneate at the 

 base, 0.5-2 dm. long, 2-10 cm. wide, coarsely toothed, the teeth apiculate : heads about 

 4 cm. broad, including the rays : involucre narrowly campanulate, the outer bracts her- 

 baceous, narrowly linear, obtuse, about 5 mm. long, the inner bracts membranous, oblong, 

 bluntly pointed, 6-9 mm. long : disk florets about twelve, yellow, about 12 mm. long, in- 

 cluding the exserted anthers : chaff of the receptacle linear, thin, obtuse : ray-flowers four 

 or five ; ligules elliptic-oblong, entire or slightly toothed at the apex : achenes narrowly 

 elliptic-oblong, wingless, about 7 mm. long : pappus none. 



On mountain slopes, North Carolina and East Tennessee. Summer. 



15. Coreopsis tinctoria L. Annual, glabrous. Stems erect, 6-12 dm. high, round, 

 striate, much branched, leafy throughout : leaves opposite ; blades of the lower twice 

 pinnately parted into linear-lanceolate or linear segments, blades of the upper leaves with 

 few lateral linear divisions or undivided : heads numerous, 2-3 cm. broad including the 

 rays : outer involucral bracts triangular-lanceolate, about 2 mm. long, the inner elliptic or 

 ovate-lanceolate, 5-6 mm. long : ligules obovate, 3-lobed at the apex : chaff of the receptacle 

 linear, acute : achenes linear-oblong, about 2 mm. long, wingless : pappus none. 



In moist soil, Minnesota to the Northwest Territory, Louisiana and Arizona. Summer and fall. 



16. Coreopsis Drummondii (D. Don. ) T. & G. Annual, pubescent with jointed hairs 

 or nearly glabrous. Stems erect, 2-4 dm. high, grooved and striate, branched above : leaves 

 opposite ; blades of all but the uppermost slender-petioled, ovate, oval or lanceolate ; the 

 lower frequently simple, or, like those of the upper stem-leaves, divided into several ellip- 

 tic-oblong or linear-lanceolate segments : heads terminating the branches, 3-4 cm. broad 

 including the rays : exterior involucral bracts linear-lanceolate, 5-9 mm. long, the inner 

 ovate, slightly longer than the outer : ligules obovate, 3-lobed at the apex : chaff of the 

 receptacle bottle-shaped, with obtuse tips : achenes obovate, about 2 mm. long, convex on 

 the back, the inner face bordered by a strongly incurved, cartilaginous margin : pappus 

 none. 



In dry soil, Texas. Summer. G Drummondii Wrightii A. Gray. A form with the divisions of the 

 leaf-blades very narrow. In dry soil, western Texas and New Mexico. 



17. Coreopsis rosea Nutt. Perennial by slender rootstocks. Stems erect, 2-5 dm. 

 high, round, striate or slightly angled above, branched, leafy : leaves opposite ; blades 

 linear, entire or somewhat two- or three-parted, connate- clasping at the sessile bases : heads 

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

 the inner ovate-oblong, about 5 mm. long : ligules pink or occasionally white, oblong-ob- 

 ovate, slightly toothed at the apex : chaff of the receptacle linear, acute : achenes nar- 

 rowly elliptic-oblong, about 2 mm. long, wingless : pappus a slight coroniform border. 



In moist or wet soil, Massachusetts to Georgia. Summer. 



18. Coreopsis cardaminef olia ( DC. ) T. & G. Annual, glabrous. Stems erect, 2-5 

 dm. high, round, striate, branched, leafy throughout : leaves opposite, remote, shorter than 

 the internodes ; blades of the lower ones once or twice pinnately divided into elliptic-ob- 

 long to linear-lanceolate segments ; of the upper either few-lobed, or, simple and linear : 

 heads about 2 cm. broad, including the rays : outer involucral bracts lanceolate, 3-4 mm. 

 long, inner ovate, about twice as long as the outer : ligules obovate, 3-lobed at the apex : 

 chaff of the receptacle linear, acute : achenes elliptic-oblong, with a wing about one-third 

 as broad as the body : pappus a pair of minute teeth, or none. 



In low grounds, Texas and Kansas to Arizona. Summer. 



19. Coreopsis stenophylla F. E. Boynton. Annual, glabrous. Stems erect, stiff 

 and wiry, very leafy, branched : leaves opposite, erect or ascending, mostly longer than 

 the internodes ; blades of the lower petioled, sometimes 2 mm. broad, simple or with 

 one or two narrow lateral segments, those of the upper leaves narrowly linear to filiform, 

 either simple or with one or more filiform lobes : heads 2-3 cm. broad including the rays : 

 exterior involucral bracts lanceolate, 1-2 mm. long, the inner ovate, 5-6 mm. long : ligules 



