370 SYNANTHERE^. 



opposite or superior alternate,. dissected; 3 \ieaAi in slender racemes or spikes, ? in clus- 

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

 '^ 89. A. artemisifolia, L. Stem erect, stout, villous or scabrons-pubesoent, branched; 

 leaves a-pinnatifid, hoary beneath ; receptacle in 3 naked; involucre obovoid around the 

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

 ^'Mart. 214.— 2'-4' high ; 3 heads l"'-2"' diam. 



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

 . J3. trinitensis. Villous ; ultimate leaf-lobes oblong or ovate, blunt. 

 Hab. Jamaica I, M'Nab, in waste places (o); cultivated in Trinidad! 03); [Canada to 

 Brazil I]. 



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

 partite : segments serrate or pinnatifid at the base ; racemes paniculate ; receptacle in 3 

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

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

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



91. A. crithmifolia, DC. Stem ascending, suffiruticose, villous-cauescent ; leaves 

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



lobes; racemes spiciform, distant, the terminal much larger, nodding; receptacle in 3 

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

 mate leaf-lobes roundish, scarcely 1'" diam. ; 3 heads 2'" diam. — Hab. Bahamas !, Hjalmars., 

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



Subseries 2. Heliantliese. Bisk-flowers hermaphrodite. Column mostly becoming black- 

 ish. Beceptacle paleaceous. Achenium Crowned, awned, or naked. — Leaves usually 

 opposite. 



26. ZINNIA, L. 



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

 lucre imbricate. Receptacle conical, paleaceous. Disk-flowers 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, X. Annual; stem erect, somewhat hispid, inflated-hoUow at the 

 ,top ; leaves oblong-laitc^late, 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,j(?^. inf. — Hab. Bahamas!, Swains.; 

 Jamaica!,.^/.,- [Carolina to Peru I and Venezuela!]. 



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

 top ; leaves oblong, or ovate-oblong, sessile, snbcordate at the base ; Involucre hemispherical : 



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

 .purple or crinisou on the upper side; paleiB with a terminal, serrate crest ; achenia of the 



disk awnless, margined, shortly i-lobed. — Jacq.Ic. Bar. t. 589. — Hab. S. Vincent !, Gmld.; 



[Guadeloupe I ; Mexico I to New Granada !] 



27. ECLIPTA, L. 



Bead shortly radiate : the ray-flowers ? , included. Involucre 2-serial, foliaceous. Re- 

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

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



■ trigonal. — Annual, scabrous, difi'use herbs ; leaves opposite, serrate or subentire, triplinerved- 

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



/ 94. E. alba, Hassk. Leaves lanceolate or eHiptioal-lanceolate, subsessile; achenium 

 tubercled, crowned with minute teeth and hairs, or naked, subtruncate. — Jaeq. Amer. Pid. 

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



■ thermalis, Bg. I, pedunoularis, Mmy !, procumbAs and brachypoda, MoA.— The West In- 

 , dian form has long-peduncled heads {i.e. E. erecta, i. or E. punctata, Jacg.). — Hab. Ja- 

 ^ maica I, all coU., in wet places ; Antigua I, Wullschl., S. Vincent I, Gviild. ; Trinidad 1, Sieb. 



