198 
Spring Flora of Oklahoma 
alternate, entire or pinnately divided. Heads radiate, soli¬ 
tary or corymbed, many-flowerd. Bracts in 2 rows of about 
8 each, the inner membranous and appressed, the outer 
narrower and spreading. Receptacle chaffy. Ray-flowers 
neutral. Disk flowers perfect, fertile. Achenes compressed, 
oval to oblong, often winged. Pappus of 2 scales or bris¬ 
tles, or wanting. 
Style-tips acute or cuspidate; outer involucral bracts 
about as long as the inner. 1. C. grandiflora. 
Style-tips truncate or obtuse; outer involucral bracts 
much shorter than the inner. 2. C. tinctoria. 
1. Coreopsis grandiflora Hogg. Large-flowered Tickseed. 
Perennial. Stem glabrous, l°-3° high. Leaves 1-2 pinnately 
parted, or the lower entire. Heads commonly several, l'-2' broad. 
Outer bracts of the involucre lanceolate, inner ones oval or ovate- 
lanceolate. Rays 6-10, yellow, lobed. Achenes broadly winged when 
mature. Pappus of 2 short scales. 
In dry soil. May-August. Frequent. 
2. Coreopsis tinctoria Nutt. Golden Coreopsis. Annual. Stem 
glabrous, 1°-3 1 A° high. Leaves 1-2 pinnately divided into linear, 
mostly entire segments. Heads 10"-12" broad. Involucre hemis¬ 
pheric, its inner bracts brown. Rays 6-10, cuneate, yellow with a 
brown base, or Drown all over. Pappus a mere border, or none. 
In moist soil. May-September. Common. 
XIX THELESPERMA Less. 
Glabrous, annual or perennial herbs. Leaves opposite, 
linear, and undivided, or finely dissected. Heads long- 
peduncled, rays sometimes wanting. Involucre campanu-’ 
late, of two distinct series of bracts, the outer short, narrow 
and somewhat spreading, the inner united nearly to or 
beyond the middle into a cup, their tips scarious-margined. 
Receptacle flat, chaffy. Ray-flowers, when present, neutral, 
rays yellow. Disk flowers perfect, fertile. Achenes papil¬ 
lose on the back, oblong or linear, slightly compressed or 
terete, wingless. Pappus of two retrorsely hispid awns or 
scales. 
Rays large; pappus-awns shorter than the width of the 
achene. 1. T. trifidum. 
