DEC. 1907. SPERMATOPHYTES FROM MEXICO GREENMAN. 271 



form. Herbaceous perennials with alternate undivided leaves 

 and few-headed cymose inflorescence. 



G. sarmentosa Greenman, sp. nov. 



Stem prostrate or ascending, rooting at the lower nodes, terete, 

 glabrous below, slightly pubescent above: leaves sessile, or the 

 lowermost short-petiolate, ovate, 3 to 6 cm. long, two-thirds as 

 broad, acute or mucronate-acute, somewhat oblique or unsym- 

 metrical at the base, at first pubescent with a few scattered hairs 

 on both surfaces, soon glabrate: inflorescence terminating the 

 stem and branches in few-headed cymes: heads pedunculate, 

 including the rays about 1.5 cm. in diameter; peduncles slender, 

 i to 7 cm. long, naked or sparingly bracteolate, subappressed- 

 pubescent: involucre 6 to 8 mm. high; bracts glabrous, yellow- 

 ish with reddish-brown nerves, the outer shorter, ovate and 

 acute, the inner oblong, rounded at the apex and subscarious- 

 margined: ray-flowers 5 to 8; rays oblong or oblong-obovate, 

 about 6 mm. long, 3 to 4 mm. broad, 2-3-dentate, white or pale 

 yellow: disk- flowers about 20: pappus persistent as short thick 

 awns, sometimes subcoronate: mature achenes oblong, 2.5 to 

 3 mm. long, much thickened, glabrous but with a slightly rough- 

 ened surface, reddish-brown. MEXICO. State of Campeche: 

 Canasayal, 12.5 km. above Champotan river, 12 December, 

 1900, E. A. Goldman, no. 448 (hb. U. S. Nat. Mus., and hb. Field 

 Mus.). The plant here described in the appearance of the 

 involucre suggests some of the Galinsogece, particularly Calea and 

 Geissolepis, and certain of the Helenioidece, especially Jaumea. 

 The paleaceous receptacle, the dorsally appressed achenes, and 

 the character of the pappus place it, however, with the Coreop- 

 sidecB. 



The genus is named in honor of its collector Mr. Edward A. 

 Goldman of the United States National Museum. 



Bidens TJrbanii Greenman, sp. nov. 



Perennial: stem ligneous, twining; branches terete, minutely 

 striate, glabrous, or puberulent in decussating lines: leaves 

 opposite, petiolate, triangular-ovate in general outline, exclusive 

 of the petiole 3 to 7 cm. long, 2 to 6 cm. broad, bi-tri-pinnatisect 

 with narrowly lanceolate acute submucronate-dentate divisions, 

 glabrous to minutely and sparingly hispidulous on the upper 

 surface, paler and glabrous or essentially so beneath; petioles 

 slender, 0.5 to 3.5 cm. long: inflorescence in terminal more or 

 less leafy paniculate cymes; the individual axillary pedunculate 

 cymes exceeding the leaves: heads radiate, during anthesis 8 to 

 10 mm. high, including the rays 2 to 2.5 cm. in diameter: invo- 

 lucre biseriate; the outer bracts of the involucre herbaceous, 

 lance-linear to narrowly spatulate, acute or obtusish, reflexed, 

 glabrous or slightly puberulent; inner involucral bracts thin, 

 dark brown or chocolate-colored with yellowish 'subscarious 

 margins: ray-flowers usually 5, sterile; rays narrowly oblong, 

 about i cm. long, obtuse or retuse, pale yellow, about 7-nerved 



