Blake — A Revision of the Genus Viguiera 51 
more spreading and often denser hairs, and paler or subcanescent, 
5-8.7 cm. long, 2.5—5.2 em. wide. Heads numerous in close clusters 
of 1-4 on axillary and terminal mostly naked peduncles 1.5 cm. 
long or less; pedicels mostly less than 1 em. long; head 3 em. wide; 
disk 9-13 mm. high, 10-15 mm. wide. Involucre 5-seriate, gradu- 
ated, 9-14 mm. high, the 2-3 outer series of phyllaries with indu- 
rated and ribbed vittate base and squarrose acute herbaceous apex, 
more or less densely hispid-pilose; the 1-2 inner series longer, 
obtuse, with somewhat elongated submembranaceous apex, 
merely strigillose and ciliolate. Rays 12, 10-13 mm. long, 2.5- 
3.5 mm. wide; disk-corollas yellow, becoming purplish above in 
age, hispidulous at least below, 5.8 mm. long (tube 1.8 mm., very 
slender, strongly ampliated at base). Pales stiffly acuminate, nar- 
row, subglabrous, purplish above in age, 7 mm. long, the outer 
rather firmly embracing their achenes. Achene glabrous, 2.5 mm. 
long. Pappus none. — Zaluzania squarrosa Sch. Bip. Flora xlvii. 
217 (1864). Gymnolomia squarrosa (Sch. Bip.) B. & H. ex Hemsl. 
Biol. Centr.-Am. Bot. ii. 163 (1881); Rob. & Greenm. Proc. Bost. 
Soc. Nat. Hist. xxix. 99 (1899). Not V. squarrosa (Greenm.) 
Blake (1913), which is a synonym of V. sphaerocephala (DC.) 
Hemsl. — MEXICO: Jauisco: Rio Blanco, Oct. 1886, Palmer 
741 (G.); Guadalajara, Sept. 1886, Palmer 486 (G.); 1. ¢., ravines, 
Nov. 1888, Pringle 2194 (G.); do., 15 Oct. 1889, Pringle _2474 
(G.); do., alt. 1370 m., 14 Oct. 1903, Pringle 11540 (G.). — The 
name of this species has been changed to prevent confusion with 
Viguiera squarrosa (Greenm.) Blake, Proc. Am. Acad. xlix. 376 
(1913), here reduced to V. sphaerocephala (DC.) Hemsl. (see p. 63). 
6. V. excetsa (Willd.) B. & H. Erect herbaceous perennial, 
about 2 m. high, simple or rather sparsely branched, the stout stem 
tuberculate-strigillose, -strigose, or -hispid, and often densely hispid- 
pilose in lines. Leaves opposite at least below, oblong-ovate or 
oblong to broad-ovate, rarely lanceolate, acute to acuminate, 
mucronate, cuneate or rarely rounded at base, distantly appressed- 
serrulate, 3-nerved, the veins reticulate, very harshly tuberculate- 
strigose above, beneath slightly but distinctly paler, strongly 
venose, hispidulous to hispid along all the veins, even the finest, 
and glandular-dotted, 5.5-13.5 em. long, 2-5.5 em. wide, on petioles 
4-12 mm. long. Heads solitary, 4-8 cm. wide, at tips of the 1-11 
tuberculate-hispid peduncles, these naked or 1-2-bracteate, (3) 
