232 COMPOSITE. (composite family.) 



long-lanceolate, acute, entire or serrulate, obscurely 3-ribbed, nearly sessile , 

 scales of the involucre ovate, acute, apprcssctl with spreading tips; rays 6-8. 

 — North Carolina, Curtis. — Stem 4° - 5° Li«rh. Heads twice as large as those 

 of No. 18. 



21. H. longifolius, Pursh. Very smooth throughput ; stem slender, 

 branching; leaves mostly opposite, linear-lanceolate, sessile, entire ; the lowest 

 tapering into slender petioles and sparingly serrate ; heads few; scales of the 

 involucre ovate-lanceolate, as long as the disk ; rays about 10. — Damp rich soil 

 in the Western districts of Georgia, Elliott. — Stem 3° -4° high. Leaves 6'- 

 8' long. Rays small. — Resembles an aquatic Coreopsis. 



H. annuus, the common Sunflower, and H. tuberosus, the Jerusalem 

 Artichoke, are commonly cultivated species. 



48. HELIANTHELLA, Torr. & Gray. 



Achenia 4-angled, compressed, slightly winged, crowned with a ciliate border, 

 or the angles prolonged into persistent, often lacerated, chaffy scales ; otherwise 

 like Ilclianthus. — Slender perennial herbs, with narrow leaves, and showy 

 heads of yellow flowers. 



1. H. grandiflora, Torr. & Gray. Hirsute; stem simple; leaves alter- 

 nate or opposite, lanceolate-linear, entire ; scales of the involucre lanceolate, 

 appressed ; pappus of two obtuse lacerated scales. — East Florida. — Stem 3° - 

 4° high. Leaves 1'- 2' long. Rays nearly 2' long. 



2. H. tenuifolia, Torr. & Gray. Hirsute; stem simple, or corymbose at 

 the summit; leaves narrow-linear, entire, the lower ones opposite or whorled ; 

 the upper alternate ; scales of the involucre lanceolate-subulate, spreading ; 

 pappus of 2-4 acute awns. — Dry sand y pine barrens. West Florida. June 

 and July. — Stem 1 ° - 2° high. Rays 1 ' - 1 £' long. 



49. ACTINOMERIS, Nutt. 



Heads manv-flowcred ; the ray-flowers 4-14, neutral, or wanting. Scales of 

 the involucre in 1 - 3 rows, leafy. Receptacle convex or conical, chaffy; the 

 chaff embracing the outer edge of the laterally compressed obovate mostly 

 winged achenia. Pappus of two persistent awns (obsolete in No. 5). — Peren- 

 nial herbs, with ovate or lanceolate serrate often decurrent leaves. Flowers yel- 

 low or white. 



* Sterna lull, branching: pappus 2-aumed. 



1. A. squarrosa, Nutt. Stem pubescent, winged above ; leaves alternate 

 or opposite, rough, ovate-lanceolate, acuminate a1 each end; beads corymbose; 

 scale, of the involucre in 2 rows, linear-epatnlate, spreading ; achenia broadly 

 obovate, winged ; awns of the pappus rigid, spreading ; rays 4 - 12, yellow. — 

 River-banks, Florida to North Carolina. Sept. — St. ma 4°-8° high. Lowest 

 leaves \" long. 



2. A. alba, Torr. »t Gray. Stem smooth, or pubescent and often slightly 



winged above; leavee alternate, rough, taneeolsjte; heads loosely corymbose ; 



