118 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Eriogonum gypsophilum Wooton & Standley, sp. nov. PLATE 49, 
Perennial from a thick, woody, cespitose base, the short branches covered 
with the villous, scale-like bases of old leaves; leaves all basal, thickly clus- 
tered, broadly ovate to rotund or reniform, entire, abruptly mucronate, the 
blades 1 to 2 cm. long, 2 to 3 cm. wide, yellowish green, thick and succulent, 
glabrous except for a few hairs on the veins beneath and sometimes on the 
margins; petioles 2 to 3 cm. long, slender, villous, especially at the base; inflo- 
rescence a trichotomous cyme 10 to 15 em. high; bracts small, not leaf-like, the 
lowest sparingly villous, the upper glabrous; involucres broadly campanulate, 
4 or 5-toothed, glabrous, with 6 flowers; pedicels slender, articulated at the base 
of the perianth, 1 mm. long or less; perianth broadly companulate, becoming 
urceolate, the segments ovate, acute or obtuse, the midrib greenish, otherwise 
bright yellow, sparingly white-pubescent on the middle or glabrous. 
Type in the U. S. National Herbarium, no 564576, collected on a hill south- 
west of Lakewood, growing in pure gypsum, August 6, 1909, by E. O. Wooton. 
The hill is capped by 50 to 100 feet of limestone, the gypsum appearing in 
several layers in the lower two-thirds. Our plant did not grow on the lime- 
stone soil but was restricted to the outcroppings of the gypsum strata. 
The species belongs to the section Corymbosa as used by Doctor Rydberg, but 
is not at all closely related to any of our western species. 
EXPLANATION OF PLATE 49.—Part of the type specimen. Natural size. 
Eriogonum leptophyllum (Torr.) Wooton & Standley. 
Eriogonum effusum leptophyllum- Torr. in Sitgreaves, Rep. Zuni & Colo. 168, 
1854. 
The plant is similar to H. effusum, with which it was at first associated, but 
differs in its linear and revolute instead of oblong and flat leaves, and in the 
low, sparingly branched inflorescence not more than 5 cm. high. In #. effusum 
the inflorescence is densely branched and often 15 to 20 cm. dong. 
Eriogonum leucophyllum Wooton & Standley, sp. nov. 
Perennial from a thick, woody root, cespitose; leaves all basal, elliptic, 
13 to 20 mm. long, about 7 mm. wide, narrowed at the base into a broad petiole 
7 to 11 mm. long, densely tomentose beneath, sericeous on the upper surface, 
white in general appearance; stems scapiform, simple below, about 30 em. high, 
slender, tomentose below, tomentulose about the inflorescence, loosely corymbose 
above, the corymb being 10 to 15 ecm. high, its slender branches ascending; 
involucres in the forks of the branches on slender peduncles 20 to 35 mm. long, 
the others on peduncles 7 mm. long or more, broadly campanulate, 2 mm. 
high, with triangular teeth almost equaling the tube, finely sericeous; perianth 
yellow, densely silvery-pubescent, some of the flowers reflexed in age; ovary 
densely pubescent. 
Type in the U. S. National Herbarium, no, 564577, collected at Lakewood 
August 6, 1909, by E. O. Wooton. 
While related to H, lachnogynum, our plant is evidently distinct in its 
broader, more densely pubescent leaves, taller stems, openly branched in- 
florescence, and much smaller and more numerous involucres. . 
Eriogonum pannosum Wooton & Standley, sp. nov. 
Perennial from a thick, woody caudex covered with the persistent bases of 
the dead leaves; stems numerous, stout, 20 to 45 cm. high, corymbosely 
branched above, densely white silky pubescent; leaves mostly basal, those of 
the stem few, scattered, reduced, the basal ones oblanceolate or spatulate, 
obtuse, abruptly short-acuminate, narrowed at the base into a long, margined 
petiole, 40 to 65 mm. long, densely and finely tomentose beneath, sericeous 
