184 
Spring Flora of Oklahoma 
VI. LEONTODON L. 
Perennial, acaulescent herbs. Leaves basal, tufted, 
pinnatifid, or sinuate-dentate. Large heads of yellow 
flowers, solitary at the ends of naked hollow scapes. In¬ 
volucre oblong or campanulate, its inner bracts in 1 series 
of shorter, somewhat spreading ones. Receptacle flat, 
naked. Rays truncate, 5-toothed. Achenes oblong or lin¬ 
ear-fusiform, 4-5-angled, 5-10 nerved, roughened or spin- 
ulose, at least above, tapering into a very slender beak. 
Pappus of numerous, filiform, unequal, simple, persistent 
bristles. 
1. Leontodon Taraxacum L. Dandelion. Leaves coafsely pin¬ 
natifid, sinuate-dentate, rarely sub-entire. Heads l'-2' broad, orange- 
yellow. Involucral bracts not glaucous, the outer elongated, con¬ 
spicuously reflexed. Achene olive-green or brownish, bluntly muric- 
ate above, its beak 2-3 times its length. Pappus white. 
In fields and waste places. A bad weed in lawns. January- 
December. Common. 
VII. SONCHUS (Tourn.) L. 
Annual or perennial. Leaves mostly toothed or pin- 
nately cut, prickly margined. Heads in corymbs or pan¬ 
icles. Bracts in several series, the outer shorter. Recep¬ 
tacles naked. Flowers yellow. Rays truncate, 5-toothed. 
Achenes oval to oblong, compressed, ribbed, truncate at 
the apex. Pappus of numerous soft, white hairs. 
1. Sonclius asfper (L.) Hill. Spiny Sow-Thistle. Annual. 
Leaves lobed or sometimes pinnatifid, undivided, spinulose-dentate, 
the lower and basal ones obovate or spatulate, petioled, the upper 
oblong or lanceolate clasping by an auricled base. Heads l'-broad 
or less. Flowers pale yellow. 
In waste places. May-November. Common. 
VIII. AGOSERIS Raf. 
Acaulescent, perennial herbs with mostly narrow, en¬ 
tire, toothed, or pinnatifid basal leaves, and large scapose 
heads of yellow, orange, or purplish flowers. Involucre 
narrowly campanulate or cylindric, its bracts imbricated 
in several series, appressed, the outer successively short¬ 
er, herbaceous, not thickened. Achenes oblong or linear, 
