Part 2, 1915] CARDUACEAE : HELENIEAE 13a 



Ligules yellowish-pink, with dark-purple veins; 

 disk -corollas olive-brown ; hairs of the achenes 

 nearly covering the body of the squamellae. 18. G. nervosa. 

 Leaves entire <>r lobed with broad divisions. 

 Perennial with a thick root. 



Plant caulescent, leafy half its length nr 



more, puberulent. 19. G. gracilis. 



Plant subacaulescent, leafy only at the 



base, densely villous. 20. G. crassa. 



Annual or biennial. 21. (/'. Meamsii, 



I >isk pale-yellow; leaf -segments divaricate. 22. G. flava. 



Pappus-squamellae elliptic, muticous or with a very short 

 awn-tip; disk yellow. 

 Ligules 15-20 mm. long; plant long-hairy; leaves deeply 



dissected. 23. G. crinita. 



Ligules 10-15 mm. long; plant short-hairy; leaves with 

 shorter lobes or merely toothed. 

 Squamellae with distinct midrib, usually excurrent 



into a short awn-point. 24. G. Pringlei. 



Squamellae without distinct midrib, muticous. 25. G. arizonica. 



Plants minutely and sparingly puberulent; catidex thick, woody, 

 multicipital; leaves entire and conspicuously punctate. 

 Plant distinctly^ caulescent; leaves spatulate to linear. 



Disk purplish; stem-leaves oblanceolate to linear. 26. G. midliceps. 



Disk yellow; stem-leaves spatulate. 27. G. spathulata. 



Plant acaulescent, scapose; basal leaves broadly obovate; disk 



yellow. 28. G. Parryi. 



1. Gaillardia comosa A. Gray, Proc. Am. Acad. 19: 34. 1883. 



A subscapose annual; leaves all basal, once or twice pinnatifid or some laciniate; lobes 



oblong, more or less toothed; scape about 1 dm. high; involucral bracts in 3 series, about 1 cm. 



long; fimbrillae of the receptacle short, soft; ray-flowers fertile; ligules 6-8 mm. long, yellow; 



disk about 2 cm. broad, yellowish-brown; corollas 6 mm. long; tube very short, scarcely 1 mm. 



long; throat campanulate; lobes very short and obtuse; achenes about 3 mm. long, densely 



long- villous, the hairs longer than the pappus and almost equaling the corollas; squamellae 



about 3 mm. long, oblong-lanceolate, with the midrib excurrent into a short awn. 



Type locality: Saltillo, Coahuila. 

 Distribution: Coahuila. 



2. Gaillardia suavis (Gray & Engelm.) Britton & Rusby, Trans. 

 N. Y. Acad. 7: 11. 1887. 



Agassizia suavis Gray & Engelm.; A. Gray, Proc. Am. Acad. 1: 49. 1847. . 



Gaillardia simplex Scheele, Linnaea 22: 160. 1849. 



? Gaillardia luberculata Scheele, Linnaea 22: 349. 1849. 



Gaillardia odorata Lindheimer; A. Grav, Bost. Jour. Nat. Hist. 6: 230. 1850. 



Gaillardia trinervata Small, Fl. SE. U. S. 1293. 1903. 



A scapose winter annual; leaves basal, somewhat lyrately once or twice pinnatifid or the 

 earliest merely lobed, or spatulate or oblanceolate, triple-ribbed and merely dentate (G. 

 trinervata), 8-15 cm. long, petioled, sparingly hairy on the margins and veins; divisions lanceo- 

 late or triangular, acute, often sinuately toothed; scape 2-6 dm. high, striate, more or less 

 hirsute; heads radiate or discoid; bracts oblong, acute, about 1 cm. long, sparingly long-hairy; 

 ray-flowers usually not well developed, either neutral or styliferous but sterile, or wanting; 

 ligules yellow, lilac, or purplish, 1 cm. long or less, 3-cleft, often irregularly so; disk purple, 

 1.5-2 cm., or in fruit 2-3 cm. broad; corollas about 6 mm. long; tube less than 1 mm. long; 

 throat elongate-campanulate, glabrous; lobes ovate, glandular-pubescent; achenes 3 mm. 

 long, densely hirsute; squamellae ovate-lanceolate, the body about 5 mm. long, produced into, 

 an awn 2-3 mm. long. 



Type locality: Plains near Bexar, Texas. 

 Distribution: Oklahoma, Texas, and Coahuila. 

 Illustration: Britt. & Brown, 111. Fl./. 3978; ed. 2./. 4548. 



3. Gaillardia lutea Greene, Pittonia 5: 57. 1902. 



A coarse, caulescent annual or biennial; stem roughish-puberulent or cinereous, 4-6 dm, 

 high, with ascending branches; stem-leaves sessile, elliptic or oblong-lanceolate, coarsely 



