Blake — A Revision of the Genus Viguiera 79 
em. wide, the upper gradually reduced. Heads 1.8-2.7 cm. wide, 
on peduncles 1.6 dm. long or less; disk 8-13 mm. high, 13-20 mm. 
thick. Involucre 4-5-seriate, graduated, 5-7 mm. high, the 
phyllaries oblong, obtuse to acutish and mucronulate, harshly and 
subdensely tuberculate-strigillose and -strigose, thick, with about 
2 pale ribs below, the short subspreading apex subherbaceous. 
Rays 12-16 or more, yellow or deep brownish-purple, 4-7 mm. 
long, 2.5-3.6 mm. wide; disk-corollas purplish or when rays yellow, 
sometimes (always, at least in youth ?) yellow, rather sparsely 
puberulous, 4.3 mm. long (tube 0.8 mm.). Pales short-acuminate, 
strigillose at the usually purplish apex, 7 mm. long. Achenes 
glabrous, 3.5 mm. long. Pappus none. — Gymnolomia Parkinsoni 
Hemsl. Biol. Centr.-Am. Bot. ii. 163 (1881); Rob. & Greenm. 
Proc. Bost. Soc. Nat. Hist. xxix. 98 (1899). G. rudis Gray! in 
Wats. Proc. Am. Acad. xxii. 424 (1887). G. rudis Gray var. minor 
Rob. & Greenm.! Proc. Am. Acad. xxix. 387 (1894). G. Parkin- 
sonii Hemsl. forma flaviflora Rob. & Greenm.! Proc. Bost. Soc. 
Nat. Hist. xxix. 99 (1899). — Two color forms may be recognized. 
7 Forma typica: radiis et corollis disci brunneo-purpureis. — @. 
Parkinsonii Hemsl. 1. c. G. rudis Gray 1. ¢. in part. G. rudis Gray 
var. minor Rob. & Greenm. |. ¢. in part. — MEXICO: Jauisco: 
Rio Blanco, Sept. 1886, Palmer 531 (cotype of G. rudis: G.); 
rocky hills near Tequila, 7 Oct. 1893, Pringle 4584 in part (TYPE of 
G. rudis var. minor: G.); bluffs of ravines near Guadalajara, 
1525 m., 6 Oct. 1903, Pringle 11538 in part (G). 
J Forma flaviflora (Rob. & Greenm.), comb. nov.: radiis et saepius 
corollis disci flavis. — G. rudis Gray 1. ¢. in part. G. rudis Gray 
var. minor Rob. & Greenm. 1. c. in part. G@. Parkinsonii Hemsl. 
forma flaviflora Rob. & Greenm. 1. c. — MEXICO: Jatisco: Rio 
Blanco, Sept. 1886, Palmer 533 (coryPe of G. rudis: G.); hillsides 
near Guadalajara, 2 Oct. 1889, Pringle 2460 (G.); near Tequila, 
Pringle 4584 in part (type of G. rudis var. minor: G.); near 
Guadalajara, Pringle 11538 in part (G.); road between Colotlan 
and Bolafios, 7-9 Sept. 1897, Rose 2827 (G.). — Palmer 533 is 
somewhat intermediate, the generally yellow rays having more or 
less purplish nervation. 

Series C. Dentatae, ser. nov. Herbae vel frutices, foliis saepe 
alternis ovatis rare lanceolatis vel ovalibus, capitulis paniculatis 
