Planta Lindheimeriane. 203 
Rep. Appendix, note 45. This species has also been sent 
from Saltillo by Dr. Gregg. Mr. Lindheimer has sent from 
the granitic region of the Liano a beautiful variety with chest- 
nut brown spines ; ?- castaneus. — The characters given in Pl. 
Lindh. to this species have been corrected in Wisliz. Rep. l. c. 
I add here only that the fruit of this, as well as of all the other 
northern Cerei seen by me, ripens within a few weeks, con- 
trary to what is observed in our Mammillarize and Opuntie, 
and mostly bursts open longitudinally, when ripe. —I cannot 
omit an interesting morphological observation made on this 
species. The usual structure of the flower of all Cerei 
observed by me is the following. ‘The ovary is covered with 
very short and (for the greater part) adnate sepals ; the adnate 
part forms a protuberance (tubercle) ; the free part is mostly 
very small, often only a minute deciduous scale. In the axil 
of the scale we find the areola, covered with a short tomen- 
tuma, long wool, and almost always with bristles or spines. All 
this together forms the pulvillus of authors. Next in order 
follow those sepals which form the tube of the flower. The 
lower of these are entirely similar to the sepals on the ovary. 
In the upper or interior sepals the tip, or free part, becomes 
larger and larger, more herbaceous, and finally more or less 
petaloid ; the wool and bristles become scarcer, but the latter 
longer, and are produced from an areola which is almost 
always situated in the axil of the sepal, where its free part 
separates from the common tube. Now in C. cespitosus, the 
free upper part of these sepals of the tube is more and more 
elongated, somewhat terete, not foliaceous, and bears the 
areola with its wool and bristles just below the subulate or (in 
the innermost sepals) somewhat foliaceous tip, reminding us 
almost of the tubercles of a Mammillaria. The descriptions 
given in Pl. Lindh. and in Wisliz. Rep. have to be corrected 
accordingly. 
CrreUs PROCUMBENS (n. sp.): humilis; caule subtereti s. 
angulato articulato ramosissimo; tuberculis aculeiferis dis- 
tinctis 4—5-fariis ; areolis parvis orbiculatis, junioribus breviter 
