172 PROCEEDINGS OF THE AMERICAN ACADEMY 



caudex-like stem, and strongly toothed involucre (this said in the let- 

 ter-press to be nearly toothless, and the stems leafy), really belongs to 

 his E. Fremonti, i. e. to E. brevicaule. 



Var. e. effusum (E. effusion, Nutt. 1. c.) Magis lanatum ; foliis 

 oblongo-linearibus nunc angustioribus margine demum pi. m. revo- 

 lutis ; cyma floribunda decomposita. paniculato-effusa, radiis ssepius 

 longioribus ; floribus albis. — Nebraska to Montana and N. New Mexico. 

 Some specimens (such as 192, Dr. Parry, from Huefano Mountains, 

 and Bentham's /3. rosmarinoides, which is not from California, proba- 

 bly from the Platte) connect this perfectly with the preceding form, 

 and with the proper E. microthecum. 



Var. £. leptocbadon. (E. leptocladon, Torr. & Gray in Pacif. 

 R. R. 2, p. 129.) Gracilius ; foliis linearibus ; cymis laxe paniculatis, 

 involucris nunc (ramulo altero abortiente) unilateralibus. — On Green 

 River, Utah, Gunnison. 



The name E. microthecum, rather than effusum, is adopted for the 

 species, because the latter is imperfectly characterized from a speci- 

 men not yet in flower, and the name is far from applicable to all the 

 forms. 



-»— -t— Rami foliati lignescentes brevissimi vel casspitoso-depressi, pe- 

 dunculum nudum elongatum scapiformem herbaceum proferentes. 

 Flores prascedentium, sed perigonii segmenta inter se fere asqualia. 

 Pedunculi et involucra 5-dentata glabri vel mox glabrati. 



40. E. brevicaule, Nutt. PI. Gamb. Caaspitoso-fruticulosum ; fo- 

 liis linearibus oblongo-linearibus vel anguste spathulato-oblanceolatis 

 in petiolum gracilem attenuatis undique niveo-lanatis vel supra gla- 

 brescentibus ; scapis rigidis 3-10-pollicaribus; cyma repitite umbella- 

 tim vel trichotome divisa, ad nodos calyculiformi-bracteatis ; peri- 

 gonii nunc Havi segmentis obovato-oblongis. E. brevicaule, campanida- 

 tum fy micranthum, Nutt. 1. c. E. Fremonti, Torr. in Frem. Rep. 

 unpublished. E. effusum var., Torr. in Sitgreaves Rep. t. 10 (non 

 descr. p. 168). E. effusum var.? nudicaule, Torr. Bot. Whipp. Pacif. 

 R. R. 4, p. 132. — Rocky Mountains, from the Platte to N. New 

 Mexico, Utah, and adjacent parts of Oregon. Nuttall's three species 

 (one of them omitted by Bentham) are not permanently distinguish- 

 able, even as varieties, and some forms of the preceding species are 

 occasionally too close. The leaves vary from 1 to 2| inches long, ex- 

 clusive of the petiole, and from one to five lines in breadth, their margins 



