Rydberg: Studies on the Rocky Mountain flora 307 



turbinate tube, which is about 2 mm. long, slightly tomentose; 

 its lobes oblong, 1 .5-2 mm. long, obtuse; perianth yellow, glabrous, 

 3-4 mm. long, with a stipelike base; divisions elliptic, obtuse, the 

 outer slightly longer than the inner; filaments ciliate; ovary more 

 or less hairy above, 3-angled. 



This species is related to E. umbellatum Torr., E. neglectum 

 Greene (£. umbelliferum Small), and E. croceum Small. It has the 

 compound inflorescence of the last one, but the leaves are green 

 and glabrate in age and much narrower than in the other species 

 mentioned. 



Utah: Fish Lake around Twin Creeks, August 8, 1905, Ryd- 

 berg & Carlton 7376, 740Q, and 7483; Fish Creek Canyon, August 2, 

 1909, A. 0. Garrett 2568. 



Eriogonum idahoense sp. nov. 



Shrub 4-6 dm. high with gray bark; branches more or less 

 tomentose, erect; leaves 2-3 cm. long, short-petioled; blades ob- 

 lanceolate, white-tomentose beneath, loosely floccose and soon 

 glabrate above; floral branches about I dm. high; inflorescence a 

 compound trichotomous flat-topped cyme; involucres in the axils 

 peduncled; peduncles of the lower forks 1 cm. long; branches of 

 the cymes short, not over 5 cm. long; involucres turbinate, about 

 3 mm. long, floccose; lobes about 1 mm. long, lanceolate-oblong, 

 obtuse; perianth yellow, glabrous, about 2 mm. long, without stipe- 

 like base; fruit unknown. 



The type was labeled Eriogonum microthecum Nutt., which 

 it resembles in habit, but the flowers are yellow instead of pink or 

 white, and the lobes of the involucres are longer and not scarious- 

 margined. It is more closely related to E. orendense A. Nels. and 

 E. campanulatum Nutt. From the first it is distinguished by the 

 leaves, which are glabrate above, the tall stem, and the more open 

 inflorescence; from E. campanulatum by the tall shrubby habit and 

 the tomentose involucre. 



Idaho: Wieser, July 7, 1899, M. E. Jones 65 11 (type, in herb. 

 N. Y. Bot. Garden). 



Eriogonum spathuliforme sp. nov. 



Perennial, shrubby at the base, leaves all near the base; petioles 

 1-2 cm. long; blades elliptic to spatulate, 1-3.5 cm - lon g- white- 

 tomentose on both sides, densely so beneath; stem scapiform, 



