Plantcc Lindh eimeriance. 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. I. 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 Mammillarise and Opuntias, 

 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. caspitosus, 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. 



Cereus procumbens (n. sp.) : humilis ; caule subtereti s. 

 angulato articulato ramosissimo ; tuberculis aculeiferis dis- 

 tinctis 4-5-fariis ; areolis parvis orbiculatis, junioribusbreviter 



