20 PROCEEDINGS OF THE A3IERICAN ACADEMY. 



aculeate or uncinate. — Benth, & Hook. f. ace. to Klatt, Leopoldina, 

 xxiii. 2, where first described. — Mexico on the Rio Taba, Liebmann^ 

 no. 552. 



Doubtful species known cliiefly or exclusively from cultivated specimens. 



Z. RcEZLii, Hort. Gard. Chron. 1872, page 1392 ; Hook. f. & 

 Jackson, Ind. Kew. ii. 1251, is a mere horticultural name for a yellow- 

 flowered annual species said to come from Mexico, but never properly 

 described. 



Z. VERTiciLLATA, Andrews, Bot. Rep. iii. t. 189, is apparently only 

 a robust cultivated form of Z. mulli flora., with verticillate leaves, and 

 double series of rays : said also to come from S. Mexico. 



Z. HYBRiDA, Romer & Usteri, Mag. Bot. St. 1 (1787), 49; Curtis, 

 Bot. Mag. t. 2123 {Z. grandiflora, Hort. fide DC. Prodr. v. 536, not 

 Nutt), is an annual with deep red rays, greenish disk, and chaff not 

 fringed at the apex : apparently only a form of Z. multiflora, with i-ays 

 becoming broad and somewhat double by cultivation. 



Z. AMBiGUA, Salm-Dyck, and Z. discolor, Hort., are names only, 

 and wholly obscure. 



IV. — REVISION OF THE MEXICAN AND CENTRAL 

 AMERICAN SPECIES OF THE GENUS GALEA. 



GALEA, L., R. Br. (Name of obscure origin. The derivation 

 from KaAds, beautiful, is unsatisfactory, and at best very doubtful.) — 

 Heads mostly small or of medium size, radiate or discoid. Involucre 

 ovoid, cylindrical, or campanulate; its scales pluriseriate, imbricated, 

 usually very unequal, the outer gradually shorter, all scarious or the 

 outer (rarely all) herbaceous or herbaceous-tipped. Receptacle small, 

 convex, or flattish, paleaceous : chaff scarious, concave, rigid or thin and 

 hyaline. Ray-flowers when present fertile ; ligules yellow, white, or 

 roseate, entire or denticulate at the apex. Disk-flowers fertile, yellow or 

 white ; the limb of the corolla regular, deeply 5-cleft. Anthers appen- 

 daged at the apex and shortly sagittate-lobed at the base. Style-branches 

 subtruncate or with a very short appendage. Achenes slender, subterete 

 or more or less distinctly 4-5-angled, usually pubescent: pappus of 4 to 

 20 subequal scales ; these mostly fringed or ciliolate, rarely wanting, 

 when numerous narrow and acuminate or when fewer usually short and 

 blunt. — About 85 species of shrubs and perennial herbs (rarely climb- 

 ers), extending from Mexico to Tropical S. America. Leaves opposite, 

 simple, mostly ovate, oblong, or lanceolate, sessile or petiolate, mostly 



