VOL. 5] Notes on Cactee. 5 
from San Luis Potosi as fairly typical C. geometrizans, the vari- 
ety differs in the usually greater number of ribs, longer radial 
spines, more approximate areolz, smaller, red fruit and seeds 
smaller at base, with much smaller and not so entirely basal 
hilum. 
ECHINOCACTUS MICROMERIS Weber, Bois Dict. 804, Mamillaria 
micromeris Engelm. L£pithelantha micromeris Web. 1. c. I agree 
with Dr. Weber that this plant, which bears its flowers near the 
tips of the tubercles, is an Echinocactus, as the genus is now re- 
ceived. Dr. Schumann appears to dissent from this view princi- 
pally on account of the ‘‘evident relationship’’ of the plant with 
M. lasiacantha—to which it seems to me.to be in no manner 
related. Dr. Engelmann, indeed, placed them in juxtaposition, 
but he seems never to have mastered the structure of 4. mzcro- 
meris, for he remarked upon its ‘“‘axillary’’ flowers and fruits. 
The seeds would indicate a very different relationship. They are 
of peculiar form and, though of smaller size, much resemble 
those of Echinocactus (Astrophytum) myriostigma. 
It is a singular fact that the first species mentioned under each 
of Engelmann’s Mamillarian subgenera: should be an Echino- 
cactus: £. micromeris under Eumamillaria, and £. papyracantha 
under Coryphantha. 
ECHINOCACTUS CAPRICORNIS Dietr. A plant in our garden, 
having its apex dried and hardened by some injury is flowering 
from all the grooves. The flowers are not single, as from areole, 
but in clusters, 1-2 cm. distant from the top of the groove. 
ECHINOCACTUS VIRIDESCENS Nutt. Mr. C. A. Purpus 
brought this winter a ripe fruit of this species, in which a large 
number of the seeds had germinated and grown to the length of 
4-6 millimetres. I have observed the same thing several times in 
the green-fruited Mamillarias. 
E. ERECTOCENTRUS Coult. In Dr. Schumann’s monograph 
this species is given as a synonym of £. Beguinii Web. in Reb. 
Cat., which is described as having its ribs completely separated 
into tubercles, while Dr. Coulter says that the ribs of his plant 
are tuberculate interrupted. To this species probably belongs /. 
