CATALOGUE. 301 



Perennial, inatted-csespitose, white-tomentose ; leaves sessile, densely crowded 

 upon the closely branched caudex, oblong or sublinear, margins revolute ; 

 head of 1-5 nearly sessile short 3-5 -toothed involucres, sessile among the 

 uppermost leaves, sometimes shortly exsert-pedunculate in fruit ; flower with 

 a broad sessile base, the calyx hardly 2" long, tomentose, 6-parted, with 

 equal oblong segments ; filaments pilose only at base ; ovary very tomentose 

 with long tangled wool. — Leaves 2-3" long, spreading from the imbricated 

 sheathing base. Discovered by Nuttall in the Rocky Mountains of Colorado. 

 Sandy foot-hills near head of Holmes Creek, Northeastern Nevada; 6,000 

 feet altitude ; September. (1,015.) 



Eeiogonum (Heteeosepala) ovalifolium, Nutt. T. S^ G., I. c, p. 164. 

 Perennial, csespitose, acaulescent, hoary-woolly; leaves oval or somewhat 

 rounded, petioled, crowded upon the numerous short branches of the caudex; 

 scape 3-9' high, simple, leafless, with a single head (very rarely 2) of few 

 (3-8) closely sessile 5-8-toothed involucres ; bracts very small or wanting ; 

 calyx with the base not produced, very glabrous, 6-parted, more or less yellow 

 or rose-colored, wholly petaloid, becoming thin and scarious after flowering ; 

 segments very unequal, the outer very broadly oval, cordate at base with 

 usually a rather deep sinus, the lobes reaching to the joint or beyond it, the 

 inner narrow, spatulate, emarginate, connivent-erect and involute, each bear- 

 ing 3 stamens at the claw-like base ; ovary glabrous ; embryo incurved, the 

 ascending radicle much exceeding the orbicular accumbent cotyledons. — 

 From Colorado to the borders of California ; Southern Utah, (Palmer.) The 

 present specimens have the flowers dull-white, usually veined with purple 

 and somewhat tinged with yellow. Frequent on the foot-hills from the 

 Washoe Mountains, Nevada, to the Wahsatch ; 5-6,000 feet altitude ; May, 

 June. (1,016.) Also collected in a reduced form on the East Humboldt 

 Mountains, Nevada, at a height of 10,000 feet; July, August. (1,017.) 



Var. Leaves oblong, long-petioled ; flowers bright-yellow. — East foot- 

 hills of the Pah-Ute Range, Nevada; June. (1,018.) 



Var. TENUius, Benth. A slender form with smaller flowers. Dry foot- 

 hills, head of Holmes Creek, Nevada; September. (1,019.) 



Eeiogonum (Capitata) Kingii, T. & G.; I. c, p. 165. Perennial, low, 

 csespitose-acaulescent, white-woolly ; leaves crowded upon the many-branched 

 caudex, spatulate, obovate, sometimes rounded, (blade 3-5" long,) long- or 

 short-petioled ; scape slender, with a single usually naked globose head; 



