264 PROCEEDINGS OF THE AMERICAN ACADEMY. 
natisect, 2 to 6 cm. long, 1 to 4 cm. broad, glabrous; divisions linear, 
acute: peduncles long, slender, 1.5 dm. or less in length, naked, sub- 
- appressed-canescent-pubescent : heads few, including the fully expanded 
rays 2.5 to 3 cm. in diameter: involucre campanulate, 5 to 6 mm. high; 
outer bracts of the involucre about 15, linear, acute, equalling or slightly 
exceeding the inner ones, canous-pubescent, the inner bracts oblong- 
lanceolate, obtuse, pubescent along the median line, scarious-margined : 
ray-flowers 8 to 10, neutral; rays whitish or roseate: disk-flowers 
yellow, numerous, 45 to 50; mature achenes linear, about 1 cm. long, 
hirsute-hispid above, bearing 2 or 3 rather short retrorsely barbed awns 
2 mm. or less in length.— Mexico. State of Michoacan: fields near 
Uruapan, altitude 1525 m., 8 October, 1904, OC. G. Pringle, no. 8814 
(hb. Gr.). 
Brpens rosea, Schz. Bip. in Seem. Bot. Herald, 308 (1852-57). 
Cosmos pilosus, HBK. Nov. Gen. & Sp. iv. 241 (1824); Hemsl. Biol. 
Cent-Am. Bot. ii. 200 (1884). Although the Humboldt and Bon- 
pland specimen on which this species was based has not been examined 
by the writer, yet there are in the Gray Herbarium several specimens 
which correspond fairly well with the original description. The mature 
achenes in the material at hand are elongated, as in many species of 
Bidens, but not attenuated above into a beak as in Cosmos, hence the 
disposition of the plant as made by Schultz Bipontinus is here main- 
tained. The following collections are taken to represent the above 
species: Mexico. State of San Luis Potosi: Alvarez, 28 September 
to. 3 October, 1902, Palmer, no. 192 (hb Gr.). State of Michoacan: 
Los Reyes, 8 to 12 February, 1903, Z. W. Nelson, no. 6868 (hb. Gr., 
and hb. U. S. Nat. Mus.). Guaremaua, Department of Santa Rosa : 
Cuijiniquilapa, altitude 800 m,, Heyde & Lux, no. 6172 (hb. Gr-). 
ar. calcicola, n. var. Leaves more divided; divisions lanceolate : 
involucre rather densely canous-pubescent. — Mexico. State of More- 
los: on limestone hills, Yautepec, near Cuernavaca, altitude 1220 m., 
21 October, 1902, C. G. Pringle, no. 11,340 (hb. Gr.). 
Bidens sarmentosa, n. sp. A low almost prostrate herbaceous 
perennial: stems freely branched, 1.5 dm. or less in length, glabrous 
or bearing a few scattered hairs: leaves petiolate, bipinnate, 1 to 1.5 cm. 
long, two-thirds as broad, glabrous on both surfaces ; segments obtuse 
or obtusish: heads small, 5 to 7 mm, high, about 1 cm. in diameter 10° 
cluding the rays, borne on glabrous or essentially glabrous peduneles 
4.5 cm. or less in length: involucre double, the outer bracts usually dy 
linear or linear-spatulate, obtusish, glabrous, sometimes ciliate-margined, 
