502 PROCEEDINGS OF THE AMERICAN ACADEMY, 
heads 1 to 1.5 cm. in diameter, subglobose, very short-pedicelled in a 
loose leafy corymb; pedicels canescent-tomentose ; scales of the involu- 
cre herbaceous, suborbicular, obtuse or rounded at the apex, tomentulose: 
ligules about 10, bright yellow, oblong, little exserted: achenes of the 
disk-flowers oblanceolate, attenuate below, narrowly winged, 6 mm. long, 
tipped with 2 (to 3) short subequal awns.— Atlixco, Puebla, Mexico, 
£. W. Nelson, 25 July to 1 August, 1893, cite number. Type in 
herb. Gray and herb. U. S. Nat. Museu 
* * * Leaves (silky-tomentose beneath) not decurrent, but stem with herbaceous 
wings, 
61. V. mots, HBK. Nov. Gen. & Spec. iv. 203; DC. Prodr. v. 
617; Hemsl. 1. c. 188; Klatt, l.c. xx. 94 (where identity of V. sericea 
is suggested). V.-sericea, Kunth & Bouché, Ind. Sem. Hort. Berol. 
1848, 14; Walp. Ann. ii. 867; Hemsl. 1. c. 190.—S. Mexico, origi- 
nally coll. between Guanajuato oe Villalpando by Humboldt & Bon- 
pland, mountains of Oaxaca, Galeotti, no. 2002, Pringle, no. 4863, 
E. W. Nelson, no. 1782, Conzatti & Gonzdlez, no. 400. 
* * * * Leaves tomentulose beneath, bearing at the base of the short petiole one 
or two small thickish auricles which soon become bao and fall off: stem 
wingless: tips of the pales straight. 
62. V. oncopHora, Robinson & Seaton, Pies. Am. Acad. xxviii. 
109. V. virgata, var.? conyzoides, DC. Prodr. v. 616; A. DC. Calques 
des Dess. t. 596. V. conyzoides, [Moc. & Sess. acc. to] DC. |. ¢ 
(1837), not Trew (1769). — State of Mexico, Bourgeau, no. 967, Prin- 
gle, no. 4310 
* * x * * Leaves smoothish beneath: stem usually provided with narrow soon 
corky wings or ridges more or less decurrent from the short petioles: tips of 
the pales recurved. 
' 63. V. virgata, Cav. Shrub 1 to 3 m. high.—lIe. iii. 38, t. 275. 
V. salicifolia, HBK. 1. ¢. 205, although described as herbaceous, is with 
scarcely a doubt a synonym, as suggested by Hemsl. Biol. Cent.-Am. 
Bot. ii. 190. © V. persicifolia, Klatt, Leopoldina, xx. 93, not DC.— 
Valley of Mexico, Bourgeau, no. 963, Schmitz, no. 52, Schaffner, no. 6 
mountains of Oaxaca, Pringle, no. 4946, H. W. Nelson, no. 1380, Con- 
zatti, no. 714; near Plateado, Zacatecas, Rose, no. 2753. 
* * * * » » Leaves not auricled at the base: stem not winged. 
: + Leaves opposite, coarsely dentate. 
64. V. serrata, Cav. Leaves ovate, finely pubescent above, cinere 
toe nelieeat beneath: pales shorter than or not greatly exceeding the 
