species. Hngelmann describes it most fully in his account 
of the Cacti of Whipple’s Expedition along the 35th parallel, 
where however, through some oversight, he places it in the 
section with tuberous roots, whilst describing these as 
fibrous. He there states that it extends from the Upper 
Missouri tothe 49thdegreeof N. Lat.,and westwards fromthe 
Missouri to 112° E. In later publications he gives the Salt 
Lake Valley, where it ascends to 6500 ft., and New Mexico. 
In Kew Herbarium there are species from the plains of the 
Sacketchawan in Lat. 52° N., collected by Bourgeau, and 
from British Colombia, between the Walla Walla and 
Colvile, collected by Lyall. 
Engelmann distinguishes six varieties, by the form of 
the joints, number length and colour of the spines, size of 
the berry, and size and margins of the seeds, but I fail to 
refer the Kew plant definitely to any one of these more 
than another. The Kew specimens flowered in the Royal 
Gardens in a cold frame during the summer months. It 
had stood unprotected for a good many years without 
flowering.—J. D. H. 
Fig. 1, Cluster of spines; 2, back, and 3, front view of stamens; 4, stigmas : 
—all enlarged, 
