44 
The rare Cevallia sinuata, which Dr. Gregg has also sent from 
Monterey, was found in this part of the journey. Here also 
occurred a perennial species of Zinwm, with yellow petals, so far, 
in America, the only perennial yellow flowering Lznzwm ; it is 
distinguished by its long aristate sepals, whence the name. 
Several Oenothera, not seen before, now made their appearance ; 
different species of Gi/ia, a number of Nyctaginee, several Ascle- 
pradacee, Malvaceae, Cucurbitacee, Composite, and others, were 
here collected ; including a number of new species, which only 
want of time and references have for the present prevented me 
from describing. Near Lake Encinillas another Martynia was 
found, which, in its foliage, comes nearer to I. proboscidea, but 
is readily distinguished by its purple flowers. A beautiful 
. yellow-flowering Bignoniaceous shrub, probably Tecoma stans, 
Juss., seen more frequently further south, was observed for the 
first time near Gallejo spring. Shrubby A/yarobie were seen 
more plentifully, as also some other M/imosee. 
Here would be the proper place to introduce a notice-of the — 
several species of Yucca found by Dr. Wislizenus. But, unfor- 
tunately, the labels of the specimens were partly lost, so that it 
is impossible at this time to arrange leaves, flowers, and fruits 
_ properly. Certain it is that several species besides Yucca angus- 
tifolia, mentioned above, were seen; that the leaves of all of 
them have filamentose edges, some with very fine, others with 
very coarse fibres on their margin; that the majority bear juice- 
less capsules with very thin, paper-like seeds, but that one 
species produces an edible succulent fruit with very thick seeds. 
Fortunately the seeds collected by Dr. W. arrived here in the 
best condition, and some have already germinated, so that we 
may hope to raise some of these species. Yucca aloifolia, of the 
southern United States and Mexico, is said also to bear an edible 
fruit, but has serrulate leaves; we have, therefore, different 
species of Yucca with edible fruits, which may constitute a pecu- 
liar section in this genus. . 
The soil appeared to be too fertile here for the production of 
Cacti ; and with the exception of some Opuntia, the only species 
collected between Paso and Chihuahua, about 100 miles south 
of the former place, was Cereus Greggii, which was peculiarly 
interesting, as it is probably the most northern form of Cereus 
roper. The specimens sent for cultivation by Dr. W. were 
unfortunately dead when they arrived here, and neither flower nor 
fruit had been obtained ; but Dr. Gregg has collected the same 
_ species near Cadena, south of Chihuahua, in flower, from which 
I completed the description. I could not have given it a more 
arr eee Lg b/ 6 
