97 [ 26 ] 
Mexican plateau. ‘This enormous cactus attained generally a heii of i 
to 2 feet; specimens 3. feet high were rare, but one paasne 
which measured 4 feet i in height, and near 7 feet in irenahfeaie nce; its oa 
was covered with ne flowers, and fruits, in all : <a of develo opment. 
In size it ranges next to E'chinocactus ingens, Zucc., specimens of which 
5 to 6 feet high Sioa collected near Zimapan, in Mexico. Another Mexi- 
can cactus, H. platyceras, Lem., is said to grow 6, and even 10 feet high, 
and proportionately shicke EB. Wislizeni.is therefore. the third in size in 
wale 
From. yo same neighborhood a beautiful Mammillaria was 
dried, as well.as living specimens. It appears to be one of the feo haa 
millariae lon simammae, though it differs in having purple, not yellow 
fowers, and ‘stiffer s spines. By the name I have given it, 17. macrome- 
ris,'* I intended to indicate the unusually large size of different. parts of 
the plant, the tubercles, the spines, and the flowers. 
nthe same region a.strange plant was obtained for the first. time, but 
then without flowers or fruit, and which, to the casual observer, appeared 
as curious as it is puzzling to the scientific botanist; single spiny sticks or 
stems having a soft and brittle wood, and a great deal of pith in the centre, 
one or more from the same root, but ‘always ithe branches, 8 to 10, feet 
high, not more than half an inch thick, frequently overtopping the brush 
among which they were found, only towards the top with a few bunches 
of already yellow leaves. In the following spriag the splendid crimson 
flowers of this plant were adound by Dr. W. between Chihuahua and. Par- 
ras, and to Dr. Gregg Iam indebted for mature fruit, so rae near Sal- 
allo and Monterey. The as proved to be y erarge two. species. a 
rs erically, and a on caren then the genus Bronnia. Havit ng . 
th flowers and fruit of a third Fouguiera, I amenabled to solve the ‘dit. 
yellow flowers 2 to 24 inches in length, campanulate; sece me 2 ih 
inch long, topped with the remnants of the flower of the s 
seeds black, rough, obliquely oval, with considerable abated” fa ack 
the curved cotyledons are partly uried. 
15 Mammillaria. macromeris, n. sp. s simplex, ovata, tuberculis, are 
e basi latiore elongatis cylindricis, i incurvis, sulcatis; areolis juni BOD 
tomentosis; acuiie angulatis rectis, elongatis, omnibus porre es al 
bus s sub-12 te oribus,. albidis; centralibus sub-3 cee AR longiori- 
ke Racor, 4 es maximis, roseis; sepalis ovatis, acutis, fimbriatis; 
ais mu eapnatis, fimbriatis; stylo- supra stamina brevia. longe exserto, 
8. 
_ Sandy soil. near Dofiana, in flower in 
ale ae oval, t to 2 inches high; septs 8 ros, tig to Sah ps 
long, incurved; groove at first tomen ag om we mee tine saeee 
ile sual 3 radial, spines to ope cnt aes is wers, 
