C 
Blake — A Revision of the Genus Viguiera 87 
Var. canescens (DC.), comb. nov. Stem, branches, and pedun- 
cles more or less densely pilose with loose spreading hairs, some- 
times canescent. Leaves ovate, entire or toothed, green above 
and densely rather softly pilose with incurved or subspreading 
hairs with glandular-tuberculate bases, beneath paler or canescent 
with dense rather soft appressed or subspreading hairs. Phyllaries 
generally subcanescent at least on margin. — V. canescens DC. 1. ¢. 
(1836); not of most other authors. V. Nelsonii Rob. & Greenm. 
1. c. (1896). — MEXICO: Jauisco: Rio Blanco, Oct. 1886, Palmer 
674 (B. M., G., Mo., U.S.); Huejotitan, 1912, L. Diguet (G., Par.); 
Zacatecas; Coulter 359 (G., K.); Guanasuato: Prov. Leon, 1829, 
Mendez (tyre of V. canescens: Prod., fragm. G.); Ravin de la 
Presa del Encino, near Guanajuato, 1900, Dugés (G.); without 
definite locality, 1897, 1904, Dugés (G.); Morgxos: near Hochi- 
ealco, Distr. Cuernavaca, 1887, C. & E. Seler 377 (G.); GUERRERO: 
between Chilapa and Tixtla, 1585-2135 m., 17 Dec. 1894, E. W. 
Nelson 2169 (coryrPE of V. Nelsonii: G.); OAXACA: mountains 
of Huitzo, 1980 m., 16 Nov. 1895, L. C. Smith 899 (coTyPE of V. 
Nelsonii: G.);(Cutapas> between San Cristobal and Teopisca, 
2040-2590 m., 1895, H.W. Nelson 3477 (G., U. S.: approaching 
var. helianthoides).<“GUATEMAL®: lightly wooded mountain 
slopes, heights by Samal4, 24 Dec. 1896, C. & E. Seler 3402 (Ber.). 
HONDURAS >) between Llano de la Puerta and El Salto-Copan, 
900 i.; 1907, Pittier 1853 (U. S.: toward var. helianthoides). 
The following specimens are intermediate between various varie- 
ties. Palmer 218 (1885), from southwest Chihuahua (G., K., U.8.), 
Palmer 618 (1880), from San Lorenzo, Coahuila (G., U. 8.), and a 
plant from Arizona (?) collected by Pringle in 1881 (G.) are more 
or less intermediate between var. brevipes and var. helianthoides. 
The two last were considered V. canescens DC. by Dr. Gray. In 
stem- and leaf-pubescence Palmer 218 is suggestive of var. canes- 
cens. In the appressed but dense hairs of the stem Palmer 674, 
quoted above under var. canescens, is somewhat intermediate be- 
tween that variety and var. helianthoides; in N elson 3477, also re- 
ferred to var. canescens, the stem is nearly glabrate. Palmer 199 
(1906), from San Ramon, Durango (U.8.), is like var. canescens 
stem-pubescence, but is otherwise nearly normal for var. brevipes. 
37. V. RETICULATA Wats. Suffrutescent, branched, about 8 dm. 
high; stem whitish, striatulate, finely appressed-pilose and gland- 
