1. Coreopsis dnctoria Nutt. 



Annual herb, erect, glabrous, 6-12 dm. tall; stems foliose, much-branched; 

 leaves opposite, subsessile or short-petiolate, usually 5-10 cm. long, 1- or 2-pinnate 

 or the uppermost ones undivided; segments (or blades) narrowly linear or linear- 

 lanceolate; heads numerous, 2-3 cm. broad, 4-6 mm. high; outer phyllaries about 

 8, more or less biseriate and imbricate, linear-oblong or more often triangulate, 

 about 2 mm. long; rays about 7 or 8, 7-15 mm. long, obovate, commonly 

 3-lobate apically, often with a red-brown spot near the base; style branches 

 apically obtuse; achenes wingless, black, 1.2-4 mm. long. 



Abundant in seasonally moist or wet soils, in Okla. (Atoka and Craig cos.) and 

 in the e. half of Tex. and less frequently nearly throughout Tex., N.M. (San Juan 

 Co.) and introd. in Ariz., spring-early summer; Minn., Sask. and Wash. s. to La., 

 Tex., N.M. and Calif. 



2. Coreopsis cardaminaefolia (DC.) Nutt. Manzanilla silvestre. 



Annual herb, glabrous, erect, slender, suberectly branched, 2-5 dm. tall; stems 

 subterete. foliose; leaves opposite, remote, shorter than the internodes, all but the 

 sessile topmost ones with petioles commonly 1-4 cm. long, the lower and midstem 

 leaves 1- or 2-pinnate with elliptic-oblong or widely or narrowly linear segments, 

 the upper ones sometimes pinnately few-lobed or sometimes simple; peduncles 

 glabrous, 1-5 cm. long; heads often numerous, 16-24 mm. broad, 6-8 mm. high; 

 outer phyllaries 6 to 9, more or less lanceolate and irregularly placed, often 

 subacute, 1-2 mm. long; rays about 7 or 8, about 1 cm. long, with a red-brown 

 spot near the base (or this absent and rays all yellow in a rare form known as 

 C. stenophylla Boynt.); style branches obtusely conic; achenes strongly winged, 

 2-3 mm. long or occasionally less, the body black; awns of the pappus (one 

 over each of the two shoulders, between the wing and the body) minute or in a 

 coastal race (C. similis Boynt.) to 0.5 mm. long. C. stenophylla and C. similis 

 Boynt. 



Abundant in seasonally wet or moist soil in Okla. (Jefferson Co.), essentially 

 throughout Tex., in N.M. (McKinley Co.) and Ariz. (Coconino and Yavapai 

 COS.), spring-early summer, occasionally again in fall; La., Okla., Tex., Neb., 

 N.M. and Ariz., s. to Tarn., Coah. and Chih. 



Some Arizona specimens are said to be C. Atkinsoniana Dougl. because of the 

 size of the achenes, but otherwise they are like C. cardaminefolia of the same 

 area. 



3. Coreopsis linifolia Nutt. Fig. 766. 



Perennial herb, glabrous, pale, erect, 5-7 dm. tall; stems slender, corymbosely 

 branched above; leaves opposite or the lower alternate, marginally entire but 

 indurate or calloused, the lower ones spatulate or oblanceolate, shorter than the 

 internodes (or the basal ones at times twice as long), 4-10 (-14) mm. broad, 

 apically rounded, basally petiolate (petioles usually 1-4 cm. long) or the other 

 ones sessile, linear, often truncate or exceedingly obtuse at the apex, much smaller; 

 peduncles usually 3-7 cm. long; heads few, 2-3 cm. broad, about 6-7 mm. high; 

 outer phyllaries about 6 to 11, glabrate, often irregularly placed, ovate to lanceo- 

 late-deltoid, lengthwise pluristriate, coriaceous, scarious at the margins, subacute 

 or rounded apically, 1-3 mm. long; rays 7 or 8, 10-15 mm. long, obovate, apically 

 3-lobed with the median lobe emarginate; style branches obtusely conic; achenes 

 winged, the wings lacerate or dissected-fimbriate-pectinate. 



Rare in wet or boggy soil, e. Tex., spring-early summer; Va. to Fla. and w. to 

 Tex. 



1661 



