574 226. COMPOSITAE 



296. Fruits compressed 297 



Fruits not compressed. Heads in corymbs 300 



297. Fruits with 3 — 4 nerves on each side. Gummiferous shrubs or trees. 



— Species 4. Island of St. Helena Commidendron DC. 



Fruits with i — 2 nerves on each side or without nerves. Herbs, under- 

 shrubs, or non-gummiferous shrubs 298 



298. Stem woody, at least at the base, rarely herbaceous throughout and then 



much branched at the base. Involucral bracts scarious at the edge, 

 usually in several rows. Marginal flowers in i — 2 rows, with a strap- 

 shaped corolla. Hairy appendages of the style-branches lanceolate. 

 Pappus-bristles in one row, rarely surrounded by a second of mucli shorter 



bristles. (See 231.) Felicia Cass. 



Stem herbaceous, not much branched at the base 299 



299. Involucral bracts membranous, in 2 rows. Marginal flowers usually in 



several rows, the outer with a narrow-linear corolla, the inner sometimes 

 with a tubular one. Hairy appendages of the style-branches usually 

 short, triangular. Pappus-bristles in i row, rarely in 2 rows. (See 



232.) Erigeron L. 



Involucral bracts herbaceous or scarious at the edges, in 3 or more rows. 

 Marginal flowers in i — 2 rows, with a more or less strap-shaped, usually 

 oblong corolla. Hairy appendages of the style-branches lanceolate. 

 Pappus-bristles in 2 or 3 rows. (See 232.) Aster L. 



300. Involucral bracts in 2 rows. Receptacle convex. Marginal flowers in i 



row, with a white, 3-toothed corolla. Fruits hairy. Pappus-bristles 

 in one row. Downy undershrubs. — Species i. Madagascar. 



Henricia Cass. 

 Involucral bracts in 3 or more rows. Receptacle flat. Marginal flowers 

 in 2 rows, with an entire corolla. Fruits glabrous. Pappus-bristles in 

 2 rows. Trees with blackish hairs. — Species i. Island of St. Helena. 



Melanodendron DC. 



301. (266.) Pappus consisting of thin, hair-hke, simple or toothed, but not 



feathery bristles, rarely outer fruits without a pappus. Receptacle 



without scales between the flowers. [Tribe SENECIONEAE.] . 302 



Pappus consisting of strong, awn-like or feathery bristles, or of scales 



sometimes united into a crown, or wanting 316 



302. Involucral bracts united below, one-ranked. [Subtribe othonninae.] 303 

 Involucral bracts free, at least at and after the time of flowering. [Sub- 

 tribe SENECIONINAE.] 306- 



303. Involucral bracts slightly united at the base. Inner disc-flowers sterile. 



Marginal flowers with a strap-shaped corolla. Fruits hairy. Inner 

 disc-fruits without a pappus, the other fruits with a pappus of numerous 

 interwoven hairs. Perennial, nearly stem-less herbs. Leaves pinnately 

 dissected. Heads solitary on a long scape. (See 236.) Ruckeria DC. 

 Involucral bracts obviously united below. Disc-flowers all fertile. 

 Pappus on all fruits. Heads on a short scape or a branched stem. . 304 



