COMPOSITE. (COMPOSITE FAMILY.) 229 



leafy spreading tips. Receptacle flat or convex, chaffy. Achenia 4-angled, usu- 

 ally compressed. Pappus of 2 (rarely 3-4) caducous chaffy scales or awns. 

 Annual or perennial herbs, with opposite or alternate, commonly 3-ribbed, undi- 

 vided leaves. Heads solitary, terminating the stem or branches. Disk yellow 

 or dark purple. Rays yellow. 



* Annual: disk dark purple: chaff of the receptacles-toothed: leaves on long and 

 slender petioles: achenia pubescent. 



1. H. debilis, Nutt. Roughish; stem slender, decumbent, branching; 

 leaves rarely opposite, deltoid-ovate, acuminate, wavy-serrulate ; heads small ; 

 scales of the involucre narrowly lanceolate, slender-pointed ; pappus 2-awned. 

 Shores of East Florida. Stem 1 - 2 long. Rays 10-14. 



2. H. prSBCOX, Gray Engelm. 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, opposite, 

 the upper ones ovate-lanceolate ; scales of the involucre lanceolate-subulate ; 

 rays 1 5 - 20. Sandy shores, West Florida, and westward. July - Sept. Stem 



2 - 3 high. 



* * Perennial : disk dark purple. 



H- Rays minute or wanting. 



3. H. Radula, Torr. Gray. Stem simple, ascending, leafy and hirsute 

 towards the base, naked and smoothish above ; leaves thick, entire, rugose, hir- 

 sute, the 4 radical ones large, roundish or rhombic ; spreading ; the lower ones 

 obovate, opposite ; the uppermost small, linear ; scales of the involucre oblong- 

 ovate ; rays mostly wanting ; chaff of the receptacle acuminate. Low sandy 

 pine barrens, Georgia, Florida, and Alabama. Oct. Stem 2 high. Heads 



rather large. 



*- * Rays conspicuous. 



4. H. angUStifolius, L. Stem rough-Jiairy or smoothish, paniculately 

 branched ; leaves linear, elongated, entire, with the margins revolute ; the lowest 

 ones opposite ; scales of the involucre lanceolate, acuminate ; chaff of the recep- 

 tacle 3-toothed ; rays 12 - 18, showy. Varies, with broader leaves, and the disk 

 at first yellow. Low ground, Florida to Mississippi, and northward, common. 

 Oct. Stem 2 - 6 high. Leaves 3' - 6' long. 



5. H. heterophyllus, Nutt. Hirsute or hispid ; stem slender, mostly 

 simple, naked above ; leaves opposite, thick, entire ; the lower ones lanceolate or 

 oblong, tapering into a petiole ; the others linear, remote ; scales of the invo- 

 lucre lanceolate, acuminate, ciliate ; chaff of the receptacle 3-toothed, the middle 

 tooth cuspidate; rays 15-20, elongated. Pine-barren swamps, Florida to 

 North Carolina, and westward. Sept. and Oct. Stem 2 - 4 high. Lowest 

 leaves 2' -6' long. Rays 1^' long. 



6. H. atrorubens, L. Hirsute or hispid ; stem sparingly branched and 

 somewhat naked above ; leaves opposite, oval, serrate, the lowest large and long- 

 petioled ; the upper small, sessile, distant ; scales of the involucre oval or oblong, 

 obtuse ; chaff of the receptacle acute; rays about 12; achenia pubescent at the 

 apex. (H. sparsifolius, Ell.) Dry soil, Florida to North Carolina. Sept. and 

 Oct. Stem 2 - 5 high. Lowest leaves 4' - 6' long. Heads rather small. 



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