Blake — A Revision of the Genus Viguiera 173 
strigillose above, very leafy. Leaves mostly alternate, only the 
very lowest opposite, crowded, linear to oblong-oval or oblong, 
entire, acute to obtusish, cuneate to rounded at base, barely peti- 
olate, usually strongly revolute, 3-nerved, above densely tubercu- 
late-strigillose, beneath somewhat paler, hispidulous on midrib, 
densely gland-dotted and somewhat minutely hispidulous, often 
subtending small leafy branches, 2.5-8.5 em. long, 1.5-12 mm. 
wide; petioles hispidulous, 0.5-1 mm. long. Heads usually num- 
erous, cymosely panicled at end of stem and upper branches on 
peduncles 1-15.5 em. long; heads 1.7-3 em. wide; disk 8-12 mm. 
high, 7—(fruit) 16 mm. thick. Involucre 5-seriate, strongly gradu- 
ated, 6-11 mm. high, the phyllaries oblong or obovate-oblong, with 
thick coriaceous pale somewhat glutinous 1-3-vittate ciliolate 
otherwise glabrous body and shorter lanceolate to deltoid abruptly 
herbaceous tuberculate-strigillose acuminate to obtuse or rounded 
spreading apex. Rays 12-20, oblong to oval, 5.5-10 mm. long, 
2.5-4.3 mm. wide; disk-corollas glandular and minutely hispidu- 
lous below, 4.5-5 mm. long (tube 0.7-0.9 mm.). Pales strongly 
nerved, truncate or mucronate, minutely strigillose above, 6.5- 
7mm. long. Achenes appressed-pubescent, 4 mm. long. Awns 
2.7 mm. long; squamellae 8-10, ‘oblong, acuminate, lacerate, up 
to 1 mm. long. — Sch. Bip. ex Hemsl. Biol. Centr-Am. Bot. ii. 178 
(1881). Helianthus linearis Cav. Icon. iii. 9. t. 218 (“ 1794” = 
1795); Ker, Bot. Reg. t. 523 (1821). H. squarrosus HBK. ! Nov. 
Gen. iv. 222. t. 377 (1820). Leighia elegans Cass. Dict. Sei. Nat. 
XXv. 435 (1822). L. linearis (Cav.) DC. Prod. v. 581 (1836). — 
Divisible on foliar and involucral characters into the following 
varieties and forms. 
Var. genuina: involucri phyllariis apice appendicibus herbaceis 
deltoideis vel deltoideo-ovatis vel ovatis obtusis vel rotundatis 
tare subacutis praeditis. — Two forms may be distinguished by 
foliar characters. 
Forma typica: foliis linearibus vel caulinis lineari-lanceolatis 
2.5-8.5 cm. longis 1.5-3(-7) mm. latis. — All the above cited 
‘ynonyms belong here. — MEXICO: Curavanua: plains near 
Chihuahua, 1885, Pringle 645 (B. M., G., K., U. S.); do., 1886, 
Pringle 898 (G., Mo.); near Balleza, 1898, Goldman 142 (G., 
U.8.); Santa Eulalia Plains, 1885, Wilkinson (U. $.); CoanurLa 
AND Nuevo Lzon: 1880, Palmer 626 (G., K., U. S.); Duraneo: 
