42 
A new species of Zalinum, with single axillary flowers, was 
found for the first time in the Jornada, but was again collected 
further south, towards Chihuahua. Dalea lanata, Centaurea 
Americana, Sapindus marginata, and a Bolivia, probably iden- 
tical with a new Texan species, brought to mind the Flora of 
Arkansas and Texas, while the gigantic chinocactus Wislizent 
reminds us again that we are approaching the Mexican plateau. 
This enormous Cactus attains generally a height of one and a half to 
two feet; specimens three feet high were rare, but one specimen 
was found which measured four feet in height, and near seven feet 
in circumference ; its top was covered with buds, flowers, and 
fruits, in all stages of development. In size it ranges next to 
Echinocactus ingens, Zucc., specimens of which five to six feet 
high, were collected near Zimapan, in Mexico. Another Mexican 
Cactus, 1. platyceras, Lem., is said to grow six, and even ten 
feet high, and proportionately thick. #. Wislizeni is therefore 
the third in size in this genus. ; 
From the same neighbourhood a beautiful MJammillaria was 
sent in dried, as well as living ‘specimens. It appears to be one 
of the few Mammillarie longimamme, though it differs in having 
purple, not yellow flowers, and stiffer spies. By the name I 
have given it, I. macromeris, intended to indicate the unusually 
large size of different parts of the plant, the tubercles, the spmes. 
and the flowers. 
In the 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 without branches, eight to ten 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 
spring the splendid crimson flowers of this plant were found by 
Dr. W. between Chihuahua and Parras, and to Dr. Gregg I am 
indebted for mature fruit, collected near Saltillo and Monterey. 
The plant proved to be a Fouguiera, two species of which have 
been found in Mexico by Humboldt ; one of them, the 7. formosa, 
a branching shrub, was only known im the flowering state ; the 
other, F. spinosa, a spinous tree, only in fruit. The structure of 
the ovary of the first appeared to differ so much from that of the 
capsule of the second, that it was afterwards deemed necessary 
to distinguish both generically, and the second constituted then 
the genus Bronnia. Uaving both flowers and frait of a third 
