348 FLORA OF TEXAS. 



LEPACHYS, Raf. 



Scales of the involucre few and small; chaff o^ the ob- 

 long or columnar receptacle truncate and thickened at the 

 apex; «c7ie?ii'« flattened and margined; j^jo/Tp 2^5 2-toothed 

 or none. Perennials. Leaves pinnately divided ; rays 

 large, drooping, yellow. 



L. PiJTNATA, Torr. and Gray. Rough with short ap- 

 pressed hairs ; stem sparingly branched ; divisions of the 

 leaves 3-7, lanceolate, acute, serrate or entire; dish yoWovf- 

 isli, oval or oblong, shorter thaii the rays ; pappus obscure- 

 ly 2-toothed. Stem 3°-4° high ; rays 2' long. 



HELIANTHUS, L. Sunflower. 



Heads many-flowered; the ray-floivers neutral; those of 

 the dish tubular and perfect ; scales of the involucre im- 

 bricated in three or more rows, with or Avithout leafy 

 spreading tips ; receptacle flat or convex, chaff'y ; aclienia 

 4-angled, usually compressed ; papjms of 2 (rarely 3-4) ca- 

 ducous chafly scales or awns. — Annual or perennial herhs, 

 with opposite or alternate, commonly 3-ribbed, undivided 

 leaves; heads solitary, terminating the stem or branches; 

 disk yellow or dark purple ; rays yellow. 



* Annual; disk dark purple; chaff of the receptacle ^-toothed; leaves on long and 

 slender petioles ; achenia pubescent. 



H. PR.^cox, Gray and En gel. Rough with scattered 

 rigid hairs, villous when young ; stem erect, paniculately 

 branched, somewhat spotted ; leaves thin, coarsely serrate, 

 acuminate, undulate, the lowest deltoid-ovate, cordate, op- 

 posite, tlie upper ones ovate-lanceolate ; scales of the invo- 

 lucre lanceolate-subulate ; rays 15-20. Stem 2°-3° high. 



** Perennial.; disk dark purple. 

 tt Bays conspicuous. 



H. ANGUSTiFOLius, L. Steiu rough-hairy or smoothish, 



