350 FLORA OF TEXAS. 



ACTINOMERIS, Nutt. 



Heads manj^-flowered ; the ray-flotuers 4-14, neutral, or 

 wanting; scales of the involucre in 1-3 rows, leafy; recep- 

 tacle convex or conical, chafify, the chaff embracing the 

 outer edge of the laterally compressed obovate mostly 

 winged achenia; paypus of two persistent awns. — Peren- 

 nial lierhs, with ovate or lanceolate serrate often decurrent 

 leaves ; flowers yellow or white. 



* stems tall, branching ; pappus 2-awned. 



A. HELIAXTHOIDES, Nutt. Stem 2°-4° high, hirsute, 

 strongly winged ; leaves 3' long, ovate-lanceolate, alternate, 

 sessile, hairy above, downy beneath; mvolucre-scales in 

 3-4 rows, broadly lanceolate, appressed; heads few; rays 

 8-14, yelloAV ; achenia winged, awns bristly ; flowers in 

 corymbs. 



COREOPSIS, L. TiCKSEED. 



Heads many-flowered; the ray-flowers commonly 8, 

 neutral, rarely wanting; involucre double, each row of 

 about 8 scales, the outer ones narrow and spreading, the 

 inner membranaceous and appressed ; receptacle flat, chaffy ; 

 c/mjT membranaceous, mostly deciduous with the achenia; 

 achenia compressed, often winged, not narrowed nor beaked 

 at the apex, awnless, or with a pappus of two upwardly 

 hispid or serrulate awns or scales. — Herbs ; leaves entire or 

 pinnately divided; heads solitary or corymbose; disk dark 

 purple or yellow ; rays yellow, rarely rose-color. 



* liays entire, or emarginate at tJie apex, yelloic. 



t Leaves 2)etioled ; achenia narrowly wedge-shaped, 'i-toothed or aicmd ; scales of the 

 invo'ucre equal, the outer ones separate. 



C. AUREA, Ait. Stem smooth, much branched; leaves 

 smooth or slightly pubescent, 5-7-parted, the divisions 

 oblong or lanceolate, serrate, toothed or lobed, or all linear 



