134 MISSOURI BOTANICAL GARDEN. 
spicuous tuberculate appearance to the surface of the plant, 
at the same time the tubercles themselves do not promi- 
nently rise above the general surface. The plants at the 
Garden have been received from various sources and the 
one which furnishes us our illustration seems to be typical 
of the species as handled by dealers. Hennings, in his 
original description in Gartenflora, used a boiled-up dried 
specimen as the subject of his illustration, This is always 
unsatisfactory, and in this instance it seems that some dis- 
crepancies have crept in. A comparison of the illustration 
with our own will show scarcely any resemblance, though 
it is possible to see how a plant such as our own might, in 
drying, take on the prominent tubercular form he figures. 
But I am unable to account for the large cushion of silky 
hairs which covers the entire crown of the plant in his 
illustration. Such an instance has never as yet come under 
my own observations, neither have I heard of anyone else 
seeing anything like it in this group of cacti. Hennings 
received his type material from Parke, Davis and Co., of 
Detroit, Mich., and to dispel any doubt that our plant is 
L. Lewinii I secured a living specimen of the plant from 
this firm, one they consider typical of the species. This 
plant is exactly the same in characters as the one we here 
reproduce in our illustration. The illustration given in 
Monatsschrift fiir Kakteenkunde is almost equally unsatis- 
factory in presenting the prominent features of this species. 
To me it appears to be no more than an unusual form of 
L. Williamsii in which the characteristic number (eight) 
of ribs is shown, though they are perhaps a little more 
inclined to be tuberculate. The grooves are deeper and 
the plant body more elongated than in any specimens I 
have yet seen in either species. — Plate 37. 
