238 COMPOSIT.E. Polymnia. 



larger 3 or 4 inches long), very short-petioled : inrolucre narrow, 5 lines long : corollas pure 

 white and anthers bright green. — PI. Wright, ii. 91. — .S. Arizona, Wriyht, Thurher, Schott, 

 Lemmon, &c. : fl. summer. 



67. POLYMNIA, L. (Name of the muse Polyhymnia, shortened.)- — 

 Perennial herbs (Atlantic-American), or some S. American species shrubby or 

 arborescent, commonly viscid-j^ubescent and heavy-scented, of coarse liabit ; with 

 mostly opposite ample and membranaceous lobed or angulate leaves, commonly 

 with margined petioles, or auriculate-appendaged at the insertion, and loosely 

 paniculate heads of yellow or yellowish flowers, or the rays sometimes white ; 

 in summer. — Gen. ed. 4, 396 ; Lam. 111. t. 711 ; Gfertn. Fruct. t. 174; DC. 

 Prodr. V. 514. Alymnia, Neck. Polymniastrum, Lam. 



§ 1. EuPOLtMNiA. Akenes somewhat obcompressed and trigonous-obovoid, 

 tricostate (namely with marginal and ventral nerves or ribs), not striate: heads 

 rather small. 



"* P. Canadensis, L. Viscid-pubescent, 2 to 5 feet high : slender branches bearing loosely 

 paniculate somewhat nodding heads of honey-yellowish flowers : leaves thin-membrauaceous ; 

 uppermost (sometimes alternate) deltoi<l-o:ate or somewhat hastate; lower variously piu- 

 nately lobed or tlie larger ones parted, acuminate, sharply denticulate, occasionally sinuate- 

 dentate : disk of the liead about 4 lines in diameter : loose outer bracts ovate-lanceolate or 

 narrower : flowers yellowish ; those of the ray 5, their ligule commonly minute or abortive, 

 so that the head is discoid : akenes smooth and glabrous or sparsely puberulent, and with 

 a narrow apiculate-protuberant epigynous disk : disk-corollas with abruptly much dilated 

 campanulate throat and ovate lobes. — Amoen. Acad. iii. 15, 1. 1, fig. .'5, & Spec. ii. 926; Lam. 

 1. c. ; Miclix. Fl. ii. 147 ; DC. Prodr. v. 515. P. Cdimdensis, var. discoidea. Gray, Man. ed. 3, 

 24S. — Shaded and damp hillsides along streams, Canada to Pennsylvania and Missouri and 

 in the higher AUeghanies to Carolina. Southward commonly with more evident rays and 

 passing to 



-—Var. radiata. Ligules developed, dilated-cuneate, a fourth to a third of au inch long, 



3-lobed, but seldom surpassing the disk, nearly white. — P. Canadensis, Torr. & Gray, Fl. ii. 

 272, mainly, from the character, excl. syn. Poir. & Lam. (which belong to a S. American 

 species). — Extends to Hot Springs, Arkansas, F. L. Harvey. 



§ 2. UvedXlia, DC. Akenes somewhat laterally compressed, very stout, 

 rather oblique, and their whole surface closely and strongly striate-nerved. (Here 

 P. variabilis, Poir., P olymiasfrum, Lam., i. e. all of f Alymnia, DC, excepting 

 the original P. Canadensis.) 



' P. Uvedalia, L. Commonly pubescent, not viscid, stout, 4 to 10 feet high : leaves ample 

 (the larger a foot or two long and nearly as broad), of deltoid-ovate outline and 3-ribbed 

 above the cuneate-decurrent base, 3-5-lobed, or the smaller only angulate-sinuate : heads 

 somewhat cymosely paniculate, short-peduncled ; the disk half-inch or more in diameter : 

 outer involucral bracts broadly ovate : rays 10 to 14, with ligules bright vello«-, linear-oblong 

 to oval, usually half-inch in length, but sometimes hardly developed : akenes 3 lines long, 

 glabrous : disk-corollas with cylindraceous throat and short lobes. — Spec ed 2 ii 1303 

 (Pluk. Aim. t. 83, f. 3; Moris. Hist. iii. 6, t. 7, f. 55) ; Torr. & Grav, 1. c. Osteospermum 

 Uvedalia, L. Sjiec. ed, 1, ii. 923. — Fertile or moist grounds. New York to Florida and west 

 to Missouri and Texas. 



68. MELAMP6DIUM, L. {Wkka,, black or dark, and -.ov,, foot, i. e. 

 black-footed, an ancient name of Black Hellebore, from the root ; unmeaningly 

 transferred to these plants.) — Branching herbs, of the warm parts of America, 

 the greater number Mexican ; with opposite mostly sessile leaves, and pedun- 

 culate heads terminating the branches or in the forks. Rays in some short, in 



