Blake — A Revision of the Genus Viguiera 99 
Series E. Brevifoliae, ser. nov. Frutices parvi valde ramosi 
canescentes, foliis parvis ovatis infra canescentibus, capitulis 
mediocribus solitariis caulem et ramos terminantibus, involucri 
3-4-seriati gradati phyllariis ovatis vel oblongo-ovatis acutis sub- 
herbaceis obscurissime costatis strigillosis, pappo interdum nullo. 
— Species typica V. brevifolia Greenm. — Three species of northern 
Mexico. Species 47-49. 
&. Pappus none; achene glabrous. :. os 6. Ve ae sk 49. V. Greggii. 
a. Pappus present; achene more or less pubescent, b. 
aves ovate or ape a leg acute or sometimes ob- 
use, on petioles 2-4 mm. long; awns equalling the 
squamellae (up to 1.7 m nel long) or slightly shorter; 
achene erst thn except at BOE. 65 oe ei va eee es 47. V. brevifolia. 
b. Leaves rotun < ro coder obtuse to rounded 
or retuse a Abe on petioles 5-7 mm. long; awns 
distinctly poe the pana oa achene ap- : 
premed pubescent ose vnc dea hes wee ee 48. V. bicolor. 
47. V. BREVIFoLIA Greenm. Much-branched shrub, 1 m. or less 
high. Stem strigillose, at length glabrate, the bark grayish. 
Leaves alternate or opposite, ovate or triangular-ovate, acute to 
obtuse, submucronulate, cuneate to truncate or rounded at base, 
entire, slightly revolute, 3-nerved, greenish or canescent above and 
strigillose, beneath canescent or whitish with dense strigillosity, 
somewhat gland-dotted, 1-2.1 cm. long, 3.5-18 mm. wide; pet- 
ioles densely canescent-strigillose, 2-4 mm. long. Heads solitary, 
1.4 em. wide, terminating slender naked or bracteolate peduncles 
(4.5-8.7 em. long) at ends of branches; disk 7-8 mm. high, 8-9 mm. 
thick. Involucre 3-seriate, slightly graduated, 4 mm. high, the 
phyllaries densely canescent-strigillose, ovate to oblong-ovate, 
acute, callous-mucronate, thickened, subherbaceous-indurated, 
slightly ribbed below. Rays 8-10, 5 mm. long, 1.8 mm. wide; 
disk-corollas slightly pubescent above, 3.5 mm. long (tube 0.7 mm.). 
Pales yellowish, pilose above, with abruptly acute glabrous more 
or less spreading apex, 4 mm. long. Achenes sparsely pubescent 
near apex, 2.6 mm. long. Squamellae about 6, lacerate, sendy. 
coherent at base, 1-1.7 mm. long, equalling the awns. — Greenm 
Proc. Am. Acad. xxxix. 103 (1903). — MEXICO: Countries 
shrubby desert in Rincon del Jabalé, southern Sierra de la Paila, 
Hacienda Nuevo Yucatdn, 1160 m., 5 Aug. 1905, Endlich 916 
ani Sierra de la Paila, Oct. 1910, Purpus 4697 (B. M., G., Mo., 
S.); Durango: Mapimi, 21-23 Oct. 1898, Palmer 527 yaa 
