BOTANY. 7 
Garretero, and other sub-tribes of the great Apacherian race, resort here for the pur f 
collecting the fruit of this pine. It probably forms one of the most important articles of their 
subsistence. In an economical view of this country, it should not be forgotten or overlooked. 
Immediately on our entrance into this valley, (November 19th,) we found and collected a new 
species of Opuntia, with prostrate, nearly terete joints, entirely devoid of woody fibre; and at 
Zuili, soon after, another, with a woody stem, low and prostrate, clearly distinct from O. arbo- 
rescens, to which it somewhat approaches in its reticulated woody axis. Its fruit, seeds, spines, 
and general habit, however, separate it from that well-known and widely disseminated species. 
Very pretty specimens in fruit were obtained, but none in flower, which is much to be regretted. 
As this tribe of interesting plants was almost the only one we could find and study, at this late 
season of the year, our party rivalled each other in daily bringing some of them into camp that 
had not been before seen or collected. Sometimes one would come in ahead of the others, but 
more frequently several would arrive at the same time with new specimens, and then a great 
shout would ensue, in deciding upon the claims of priority. Lieutenant Whipple discovered 
the first specimen of our new Cactodendron, as we were pleased to call it, to distinguish it from 
the O. arborescens. We saw this same species afterwards growing six to eight feet high, 
retaining all its peculiar characteristics, with the exception of not being prostrate. While on 
the banks of the Colorado Chiquito, and only in that vicinity, we found a new Echinocactus, 
the first of this genus met with on our route, but it was neither in flower nor fruit. Itis quite 
limited in its range, having been found only along the bottom lands of the Rio Colorado Chiquito. 
In the rocky ravines, soon after leaving the river bottoms, we discovered a densely aggregated 
Cereus, growing in large oval masses, which contained hundreds of low, ovate, fleshy stems, from 
one root. Our highly esteemed friend, Dr. Engelmann, has made several species of such forms 
of cerei, which are difficult to identify in the absence of flowers or fruit, on account of the great 
variety in the number, size, and color of spines in the same species. The spines in the plant just 
mentioned are angular, like those of Dr. Engelmann’s Cer. enneacanthus; but they also very much 
resemble those of his Cer. polyacanthus. The cactaceze can only be well characterized by 
their inflorescence, fruit, and general habit. Opuntia fragilis is very common in this valley, 
offering many varieties of shape, size, and color of the spines. Nearly all cactaces assume a red, 
shrivelled, drooping appearance at this season of the year, very different from what they exhibit 
when in vigorous growth. Cereus Fendleri, which is very common about the Pecos and Rio 
Grande, has nearly its western limit here, soon to be replaced by Cer. Chloranthus, an unpublished 
species of Dr. Engelmann. Among the shrubs peculiar to this part of the country is the beau- 
tiful and very aromatic Cowania Stansburiana. In Capt. Sitgreaves’ reports, Dr. Woodhouse 
mentions having seen an aromatic Fallugia paradoxa in this region, which must be a mistake. 
It was this plant ; for, although the fallugia and cowania somewhat resemble each other, the 
former is never aromatic and balsamic, like the latter. The cowania grows on much more ele- 
vated positions than the fallugia, and is considered by the Mexicans as a most valuable medi- 
cine ; often selling at the rate of half a dollar an ounce, under the name of alouseme. It is 
_ highly esteemed as a styptic, and astringent in hemorrhagic discharges. A beautiful blue- 
berried barberry (Berberis pinnata) is very common here, called by the Mexicans lea amorilla. 
This shrub is very different from the one at the Copper Mines, (Santa Rita del Cobre,) collected 
when I was on the Mexican boundary commission. The berries are very pleasant to the taste, 
being saccharine with a slight acidity. Fallugia, cercocarpus, and another thornless rosaceous 
shrub, probably a cretagus, is common along the arroyos and rough low places. The Obione 
canescens, and other species of the same genus, though not peculiar to this region, are met with 
here in great abundance. The former is called by Mexicans chamizo, and by our people grease- 
wood. It belongs to the tribe of chenopods, and we noticed that our sheep were very fond of 
browsing upon it, choosing it in preference to grass. It is an unsightly weed, with a sub- 
shrubby stem, but withal very useful when we could get no better material for fuel. 
