Blake — A Revision of the Genus Viguiera 105 
1894, Pringle 5610 (G., Mo.); Sierra de Reyes, 2135 m., 10 Nov. 
1894, Pringle 5635 (G.). Mexico without definite locality: near 
Rancho del Lorno, C. Ehrenberg 1558 (Ber.). COSTA RICA: 
savannas, Boruca, Dec. 1891, Pittier 4675 (B. M., G.); dry rocks, 
Quebrada de Tapshi, near Boruca, Jan. 1893, Pittier 7344 (G.). 
Z PANAMA? vicinity of O14, Coclé, 100-350 m., Dec. 1911, Pittier 
5033 (U-S.). —T. 2. Fic. 12, T. 3. Fie. 6. 
Forma alba (Rose), comb. nov.: radiis albis. — Viguiera tenuis 
Gray var. alba Rose! Contr. U. 8. Nat. Herb. i. 336 (1895). — 
MEXICO: Co.rma: grassy hillsides, Colima, 9 Jan.—6 Feb. 1891, 
Palmer 1151 (tTypE couu.: B. M., G., K., Mo.); Muicnoacan: 
granitic soil, El Ocote, Cerro Pedregoso, 450 m., 28 Oct. 1898, 
Langlassé 535 (G.). — Of the characters mentioned by Dr. Rose 
as distinctive (smaller heads and leaves, pales and phyllaries more 
or less purplish, and rays white), only the color of the rays is at all 
peculiar to this form as distinguished from ordinary plants of the 
species. 
54. V. aracititima Brandegee. Much branched annual, the 
stem rather sparsely strigose, slender. Leaves opposite below, 
alternate above, subrhombic-ovate, acuminate or obtusely short- 
pointed, broadly cuneate at base, serrate (teeth about 9 pairs, 
deltoid, mucronate), above dark green, subdensely and finely 
strigillose and sparsely hispid-strigose, the hairs all with persistent 
bases, beneath paler green, tuberculate-strigose, 1.8-3.5 cm. long, 
1-1.8 cm. wide (the lowest not seen), on petioles 4-13 mm. long. 
Heads numerous in a loose irregular panicle, about 11 mm. wide, 
the ultimate pedicels 4 em. long or less, mostly naked, rather 
densely strigose ; disk at first thick-cylindric-campanulate, 7 mm. 
high, 5 mm. thick, in age broadly campanulate, 7-8 mm. wide and 
thick. Involucre 2-seriate, 4.5-5 mm. high, the phyllaries about 9, 
lanceolate, acuminate to attenuate, subdensely canescent-strigose, 
herbaceous, slightly indurated below. Rays about 5, oval, 2.5 mm. 
long, 1.8 mm. wide; disk-corollas about 21, puberulous below, 4.2 
mm. long (tube 1.2 mm.). Pales strigillose on keel, abruptly short- 
pointed, 7-7.5 mm. long. Achenes appressed-pilose, 3 mm. long. 
Awns 3.5-4 mm. long; squamellae about 6, lacerate, slightly united 
at extreme base, 1.5 mm. long. — Brandegee! Univ. Calif. Publ. 
Bot. vi. 74 (1914). — MEXICO Picacho to San Gero- 
nimo, Oct. 1913, Purpus 6675 (TyPE coLu.: B. M., G., Mo.). 
