Contributions to Western Botany. ee 
at high elevations in the Sierras; bisceptrum, walls of mesh- 
es less deeply crinkled and not so coarse, meshes 2-3 by 1-2”, 
near the top shoe-shaped 2-24 by 1”, flowers white to pink, 
_tall plants, with wide leaves, growing at middle elevations, 
Nevada to Utah; Sanbornii may come bere. 
Ribs branching into equal divisions and uniting to form 
large and diamond-shaped meshes, the interspac: filled with 
a delicate membrane which has large, vertically oblong and 
rectangular meshes. 
2AB. Plants producing bulblets freely among the flowers, pedi- 
cels filiform and sinuous—Canadense, thin membrane with 
meshes 14-2 by 1-14”, hexagonal, ends often oblique, bulb- 
lets large, rather coarse plants; Geyeri, slender plants, bulb- 
lets small; Geyeri var. tenerum, very slender plants of 
swamps, main meshes 10-13 by 3-4’’, bulblets small. 
2A2B. Plants rarely if at all producing bulbets, pedicels not 
sinuous—reticulatum; reticulatum var. deserticola, main 
meshes 22 by 7”, outer coat 5 by 4-2”; mutabile; Nuttallii, 
meshes of membrane 1-14 by 1’’, main meshes very large. 
NOTE—Unless otherwise stated the onion markings figured are from the 
t 
center of the coa 
ERRORS—Page 31, Allium lacounsum should be lacunosum. 
Page 51, last line, A. angustifolia should be linearis. 
