GENUS 70. 



THISTLE FAMILY. 



493 



10. Coreopsis delphinifolia Lam. Lark- 

 spur Tickseed. Fig. 4501. 



Coreopsis delphinifolia Lam. Encycl. 2: 108. 1786. 



Perennial ; stem glabrous, branched above, rather 

 slender, i-3 high. Leaves sessile, i-2-ternately 

 partly into linear or linear-lanceolate segments, 

 which are i'-2' long, i"-3" wide; heads several 

 or numerous, \\'-2 r broad; involucre hemispheric, 

 its bracts glabrous, the outer linear-oblong, ob- 

 tuse, shorter than or equalling the ovate-oblong 

 inner ones; rays 6-ro, yellow, entire; disk brown; 

 achenes oblong to oval, narrowed at the base, 

 narrowly winged; pappus of 2 short teeth. 



In dry woods, Virginia (according to Torrey and 

 Gray), North Carolina to Georgia and Alabama. 

 Aug.-Sept. 



ii. Coreopsis cardaminefolia (DC.) T. & G. 

 Cress-leaved Tickseed. Fig. 4502. 



Calliopsis cardaminefolia DC. Prodr. 5: 568. 1836. 

 C. cardaminefolia T. & G. Fl. N. A. 2 : 346. 1842. 



Annual; stem glabrous, branched, i-2i high. 

 Basal leaves petioled, 2-4' long, i-2-pinnately parted 

 into oblong or oval obtuse segments, the petioles 

 sometimes slightly ciliate ; stem leaves distant, ses- 

 sile, or nearly so, pinnately parted into linear seg- 

 ments, or the uppermost entire ; heads 8"-i2" broad, 

 slender-peduncled ; involucre hemispheric, its inner 

 bracts brown, ovate or ovate-lanceolate, obtuse or 

 obtusish, scarious-margined, much longer than the 

 lanceolate obtusish outer ones ; rays 4-8, yellow with 

 a brown base, 3-toothed; achenes oval, \"-\\" long, 

 winged, smooth, or slightly papillose; pappus of 2 

 minute awns, or none. 



In moist soil, Kansas to New Mexico, Louisiana and 

 northern Mexico. May-Oct. 



Coreopsis Atkinsoniana Dougl., a northwestern 

 species, with linear leaf-segments and very narrowly 

 winged achenes, ranges eastward into North Dakota. 



12. Coreopsis tinctoria Nutt. Golden Co- 

 reopsis. Garden Tickseed. Fig. 4503. 



C. tinctoria Nutt. Journ. Acad. Phila. 2: 114. 1821. 



Annual; stem glabrous, branched, i-3i high. 

 Leaves i-2-pinnately divided into linear, obtusish, 

 mostly entire segments, or the uppermost linear and 

 entire, the lower petioled; heads slender-peduncled, 

 io"-i2" broad, or in cultivation much broader ; invo- 

 lucre hemispheric, its inner bracts brown, ovate or 

 oblong, obtuse or acute, scarious-margined, 3-5 times 

 as long as the obtuse outer ones ; rays 6-10, cuneate, 

 yellow with a brown base or brown all over ; achenes 

 linear or linear-oblong, about i" long, wingless; pap- 

 pus a mere border, or none. 



In moist soil, Minnesota to Alberta, Nebraska, Louisi- 

 ana and Arizona. Escaped from gardens to roadsides 

 and waste places eastward. Wild flax. Nuttall's-weed. 

 May-Sept. 



