ROBINSON & GREENMAN: CONTRIB. GRAY HERBARIUM. 101 
4K RR RK — large (1.7 to 7 cm. broad excl. of rays); involucral bracts 
broad, the - large, spatulate with rounded apex: perennial herbs: 
leaves ianaboinw to oblong or ovate ; petioles short winged, or almost none. 
+ Leaves oblong-lanceolate, pale beneath. 
32. G. GHiesBReGHTI, Hemsl. Erect, simple or branched from 
the base, 6 to 15 dm. high: leaves all alternate or some opposite, 
serrate or serrulate, mostly acute at each end, 5 to 10 em. long, 1 
to 4 cm. broad: heads few, 2 to 2.5 ecm. in diameter; outer scales 
short, squarrose: ligules about 20, golden yellow, 2 cm. long. — 
Hemsl., 1. ¢., 162.— South Mexico, hills of Oaxaca, Ghiesbreght, 
nos. 385 (ace. to Hemsl.), 382, Pringle, no. 4963, #. W. Nelson, 
nos. 1371, 1464, LZ. C. Smith, no. 799, Conzatti and Gonzdlez, no. 
553; Michoacan on wooded hills near Patzcuaro, Pringle, no. 
3339. 
« + Leaves elliptical, green beneath. 
33. G. DECUMBENS, Robingon. Stems several from a lignescent 
stock, ‘decumbent, 4to 5 dm. long: leaves chiefly opposite, 2.5 to 
4 cm. long, half as broad, scabrous upon both surfaces: heads 
solitary or borne by threes at the summit of each stem; outer scales 
of the involucre ovate-lanceolate, acute, not squarrose, dark colored, 
covered with appressed white hairs. — Proc. Amer. acad., 26, 165, — 
Rocky hills, Tultenango, State of Mexico, Pringle, no. 8263 in 
part; Zacatecas between Bolaiios and Guadalajara, Rose, no, 3044 
(leaves somewhat longer). 
The achenes of this species are perfectly glabrous, obovate- 
oblong, strongly compressed, striate, and completely destitute of 
pappus. It is now found that another plant of astonishing similarity 
was also collected and distributed under the type number (Pringle’s 
no. 3263). While in all observed external characters it cannot be 
distinguished from the former, it has thick obtusely 4-angled mot- 
tled and pubescent achenes which are crowned with 2 (to 4) palea- 
ceous awns and intermediate scales. The latter plant seems to be 
identical with Viguiera ghiesbreghtii, Gray. 
+ + + Leaves ovate, large and broad. 
++ Petioles not auricled. . 
= Outer involucral bracts large, wines pied spreading or reflexed, 
about as long as pa, aw P 8, acute or Roun te. 
34. G. ruaya, Hemsl. Stems pe a ‘becoming ‘hirsute with 
coarse spreading hairs toward the summit and upon the peduncles : 
