Zinnia. COMPOSITE. 253 



§ 2. Leaves attenuate to both ends and short-petioled ; their axils triply spi- 

 niferous. — § Acantltoxunthiurn, DC. 



X. si"in6suh, L. a foot or two high, much branclied : leaves ovate-lanceolate with cuneate 

 base, the larger 3-lobed or incisely piunatifid, glabrate aud green above, white-tomentose 

 beneath : axils bearing long aud slender 3-parted yellow spines : fertile involucres solitary 

 or few in ujjper axils, cylindraceous, lialf-iuch long, obtuse, armed with short weak prickles, 

 inconspicuously 1-2-beaked or pointless. — Lam. 111. t. 655, f. 4; DC. 1. c. — A weed of 

 y. Atlantic States and Pacific coa.sts, occasionally about seaports northward to Massachusetts. 

 (Kat. from Trop. Am.) 



84. Zf NNIA, L. (Dr. ,/. G. Zinn, of Gottingen, who figured the original 

 species as a Rudbeckia.) — American, chiefly Mexican, herbs or suffruticulose 

 plants ; with opposite and mostly sessile entire leaves, single heads terminating 

 the branches, and showy flowers, the bright-colored rays long enduring : fl. sum- 

 mer. — Gen. ed. fi, 437 ; Gajrtn. Fruct. t. 172 ; Gray, PL Wright, i. 105. Zinnia 

 & Diphthrix, DC. Prodr, v. .534, r)ll. 



§ 1. EuziNXiA. Herbs, mostly annual (some species perennial) : leaves from 

 ovate to linear : ray-flowers several or numerous, usually without pappus. — PI. 

 Wriglit. 1. c. 



Z. pauciflora, L. Erect annual : leaves from lanceolate to oblong-ovate, commonly with 

 subccn-date base, scabrous: peduncle sometimes enlarging and hollow: involucre narrow- 

 cam])anulate : ligules from obovate to narrowly spatulate, red, purple, or yellow : akenes of 

 the disk 1-awued, sometimes with a rudiment of a second awn or tooth. — Webb, Spic. 

 Gorg. 141. Z.paucifom & Z. mvlti flora, L. Spec. ed. 2, 12G9 (L. f. Dec. t. 12). Z. tenni- 

 flora, ,Tacq. Ic. Rar. t. 590, with narrow ligules. Z. reroluta, Cav. Ic. iii. 251. Z. leptopoda 

 & probably Z. hicuspis, DC. Prodr. v. 5.35. Z. intermedia, Engelm. Bot. Wisliz. 23. — Lou- 

 isiana to Texas, but probably introduced, Arizona, apparently indigenous. (Mex., S. Am., 

 aud now widely dispersed.) 



§ 2. DiPLOTHRix. Suffruticulose and tufted perennials : leaves narrow and 

 rigid, connate-sessile, usually crowded : ray-flowers commonly few, and their 

 akenes 2-4-aristate : head conspicuously pedunculate only in Z. juniperifoUa. — 

 PI. Wriglit. 1. c. Diphthrix, DC. 



* Ligules shorter tlian or little surpassing the disk, sometimes wanting: stems mainl}' herbaceous. 

 — § Ihterogyne, Graj', PL Wright. 1. c. 



Z. anomala, Gray. Scabrous-hispid : stems or branches very numerous from a ligneous 

 base and root, 4 to 8 inches high : leaves linear (half-inch to inch long, less than 2 lines 

 wide), one-nerved, obscurely 3-nerved at base : peduncle shorter than the uppermost leaves : 

 involucre oblong or campanulate (half-iucli long) : ligules 4 to 6, oval or oblong, 1 to 3 lines 

 long, yellow or orange, occasionally the whole corolla wanting : hispid style-branches of the 

 disk-flowers acuminate-subulate. — PI. Wright, i. 100, t. 10, & ii. 86. — S. W. Texas, IVri/j/u. 

 (Mex. near Saltillo, Palmer, with broader involucre.) 



* -* Ligules (4 or 5) ample, dilated-obovate or roundish, at maturity much surpassing the disk, 

 light yellow or sidplnir-color, becoming white in age: involucre narrow: stems or branches a 

 span (ir more high from the stout woody base or branching caudex. 



Z. grandiflora, Nutt. Scabro-hispidulous : leaves linear, 3-nerved at base: involucre 

 usually 4 lines long: ligules at maturity 5 to 8 lines long : style-branches of the disk-flowers 

 attenuate-subulate. — Trans. Am. Phil. Soc. n. ser. vii. 348 ; Torr. & Gray, Fl. ii. 298 ; Torr. 

 in I'mory Rep. t. 4 (style incorrect) ; Gray, 1. c. — Plains and bluffs, E. Colorado to S. W. 

 Texas and Arizona. 



Z. puraila, Gray. Cincreous-puberulent : leaves very narrowly linear (hardly half-line 

 wide, half-inch or less long), one-nerved : involucre 2 or 3 lines long, and ligules 2 to 4 lines : 

 style-branches of disk-flowers with short triangular-subulate tips. — PI. P'endl. 81, PI. Wright, 

 1. c. — High plains and table-lands, S. W. Texas to Arizona. (Adj. Mex.) 



