126 CALIFORNIA ACADEMY OF SCIENCES. 



In P. Douglasii, which we dedicate to perhaps its very ear- 

 liest collector, the secondary veins, when apparent at all, 

 are not parallel, bnt pinnate. The plant is variable, and 

 yet the var. latifoliv/m may be a distinct species; the shape of 

 the akene is peculiar. 



P. Engelmanni- 



Erect-spreading, diffusely branched from the base, a span 

 or more high, reddish, very minutely scabrous-puberulent 

 throughout: branches slender and somewhat flexuous: stip- 

 ules sparingly lacerate, short, with no tubular or herbaceous 

 portion; leaves lanceolate, acute, with revolute margins, ^ 

 inch or more long, the upper much smaller and remote: 

 flowers in all the axils, solitary or in twos or threes, very 

 small: pedicels strongly defiexed: sepals obtuse, shorter 

 than the very small, ovate, shining akene, and but loosely 

 investing it. — P. tenue, var. microspermum, Engelm. 



Rocky Mountains of Colorado at considerable elevations. 

 Very unlike any forms of the preceding species; differing 

 not more remarkably in the minuteness of its flowers and 

 fruit than in its peculiar erect-spreading habit and the fact 

 of its flowering from the very base of the stems and b ranches. 



EFJOGOflUM. . 



E. robustum. 



Crespitose; the very thick caudex much branched; tomen- 

 tose : leaves ovate, 1 — 1| inches long on stout petioles of 2 

 inches, densely tomentose on both sides; peduncles very stout 

 and fistulous, 6 inches high and rigidly erect : the broad, 

 ample umbel of about 5 thrice divided rays; umbels and um- 

 bellets subtended, the former by spatulate, the latter by 

 linear-lanceolate leaflets an inch long: involucres half inch 

 long: flowers cream-colored, 3 lines long; basal stipe very 

 short: akene smooth. 



On the Geiger grade between Reno and Virginia City, 

 Nevada, July, 1884, Mrs. Curran. 



