M. vivipara has a wide distribution on the plains and 
the eastern slopes of the Rocky Mountains, from the 
Missouri River in Dakota, to Texas, S. Utah, and Arizona. 
The specimen figured was purchased for the Royal 
Gardens, Kew, from Mr. D. M. Andrews, Nurseryman, of 
Boulder, California. It has proved to be so far hardy 
as to have, along with M. Nuttallii, Engelm., flowered in 
July, in the open air, between the buttresses of the 
Palm House, after having been exposed to the winter of 
1898-99, —— 
Deser.—(Of the specimen figured.) Stem four inches 
high, and three in diameter, solitary, ovoid, lurid 
green. Tubercles about an inch long, sub-erect, ovoid- 
oblong, terete, smooth. Spines twelve to thirty-six, one- 
half to three-quarters of an inch long, slender, stiff, outer 
radiating more or less horizontally, a few central, stouter, 
more erect, all purplish-brown. lowers towards the top 
of the plant, several opening together, about an inch and 
a half in diameter. Sepals rather short, linear-oblong, or 
oblanceolate acute, pale brown, recurved, margins fim- 
briate. Petals much longer, narrowly oblanceolate, acumi- 
nate, with a minute, terminal bristle, margins fimbriate. 
Anthers yellow. Stigmas about thirteen, narrowly linear. 
ae 
. . e 
Fig. 1, group of spines; 2, petal; 3, style and stigmas :—All enlarged. 
