3?0 SYNANTHEKEiE. 



opposite or superior alternate, dissected ; c? heads in slender racemes or spikes, $ in clus- 

 ters at the base of these, or in the axils of the uppermost leaves, 



89. A. artemisifolia, Z- Stem erect, stout, villous or scabrous-pubescent, branched ; 

 leaves 2-pinnatifid, hoary beneath ; receptacle in g naked; involucre obovoid around the 

 acheniuni, armed with 5-6 acute points. — Desc. Fl. 1. t. 55. — A. elatior, Z., Sw., Sieb. 

 Mart. 214.— 2'-4' high ; $ heads l'"-2'" diam. 



a. jamaicensis. Scabrous-pubescent ; ultimate leaf-lobes oblong-lanceolate, acuminate. 

 /3. trinitensis. Villous ; ultimate leaf-lobes oblong or ovate, blunt. 

 Hab. Jamaica 1, M'Nab, in waste places (a) ; cultivated in Trinidad ! (j3) ; [Canada to 

 Brazil !]. 



90. A. psilostachya, DC. Pubescent; stem erect, branched above; leaves pinnati- 

 partite •. segments serrate or pinnatifid at the base ; racemes paniculate ; receptacle in $ 

 paleaceous ; involucre obovoid around the achenium, unarmed, pubescent. — A. coronopifolia, 

 T. Gr. — Habit of the preceding, 2-5' high; leaves variable. — Hab. Jamaica!, all coll., a 

 weed, forming thickets in waste places ; [Cuba!; Illinois to Mexico !]. 



91. A. crithmifolia, DC. Stem ascendiug, suffruticose, villous-canescent ; leaves 

 thickish, hirsute-canescent chiefly beneath, the inferior 2-pinnatipartite with short, blunt 

 lobes; racemes spiciform, distant, the terminal much larger, nodding; receptacle in $ 

 paleaceous ; involucre obovoid around the achenium, unarmed, villous. — 6"-12" high; ulti- 

 mate leaf-lobes roundish, scarcely 1'" diam. ; <? heads 2"' diam. — Hab. Bahamas !, Hjalmars., 

 Turk Islands ; [Key West, on the seashore, Cuba]. 



Subseries 2. Heliantiiese. Disk-jlowers hermaphrodite. Column mostly becoming black- 

 ish. Receptacle paleaceous. Achenium crowned, owned, or naked. — Leaves usually 

 opposite. 



26. ZINNIA, Z. 



Head radiate: the ray-flowers ? , with the ligule leathery, persistent on the fruit. Invo- 

 lucre imbricate. Receptacle conical, paleaceous. Disk-jiowers villous at the lobes. Style- 

 branches with a conical, hairy appendage. Achenia of the disk compressed, usually 1-2- 

 awned, of the ray subtrigonal. — Herbs ; leaves opposite, entire ; heads solitary, terminal. 



92. Z. multiflora, Z. Annual; stem erect, somewhat hispid, inflated-hollow at the 

 top; leaves oblong-lanceolate, with a rounded, subsessile base; involucre campanulate: 

 scales appressed ; ligules obovate, purplish or yellow on the upper side ; palea entire, ob- 

 tuse ; achenia of the disk \-awned. — Lam. III. t. 685, fig. inf. — Hab. Bahamas!, Swains.; 

 Jamaica!, At.; [Carolina to Peru ! and Venezuela !]. 



93. Z. elegans, Jacq. Annual; stem erect, scabrous, equal or slightly inflated at the 

 top ; leaves oblong, or ovate-oblong, sessile, subcordate at the base ; involucre hemispherical : 

 scales usually squarrose with a broad, greenish, often black -bordered summit ; ligules obovate, 

 purple or crimson on the upper side ; palea with a terminal, serrate crest ; achenia of the 

 disk aumless, margined, shortly 1-lobed. — Jacq. Ic. Rar. t. 589. — Hab. S. Viucent !, Guild. ; 

 [Guadeloupe ! ; Mexico 1 to New Granada !] 



27. ECLIPTA, Z. 



Head shortly radiate : the ray-flowers $ , included. Involucre 2-seiial, foliaceous. Re- 

 ceptacle paleaceous : palese-linear. Corolla of the disk 4-toothed. Style-branches blunt- 

 ish, hairy. Achenia of the disk compressed, naked, or obsoletely crowned, of the ray sub- 

 trigonal. — Annual, scabrous, diffuse herbs : leaves opposite, serrate or subentire, triplinerved- 

 arch-veined ; heads axillary and terminal, peduncled, single-tent ate, white. 



94. S. alba, Hassk. Leaves lanceolate or elliptical-lanceolate, subsessile; achenium 

 tubercled, crowned with minute teeth and hairs, or naked, subtruncate. — Jacq. Amer. Pict. 

 t. 197. — Verbesina, Z. E. erecta, prostrata, and punctata, Z. E. longifolia, Schrad.!, 

 thermalis, By. !, peduncularis, Remy .', procumbcns and brachypoda, Mich. — The West In- 

 dian form has long-peduncled heads (t. e. E. erecta, Z. or E. punctata, Jacq). — Hab. Ja- 

 maica !, all coll., in wet places , Autigua !, Wullschl., S. Viucent !, Guild. ; Trinidad !, Sieb. 



