+ 
# r 
~ 
in a Lindh. |. c.,) was found, w extends from here to Mata- 
ma <«. (oe 
> ; 
very much branched, often with remarkably small leaves, ‘arid not rarely. 
with edible fruits. Amon ug them many rhammaceous and celastraceous ~ 
shrubs, and some Euphorbiaceae, were particu ot conspicuous, as well 
as some Wimoseae, one of which I saws not forget to mention, because it 
is perhaps the smallest shrub in this family; not more than one or two 
inches high, with tits aos. aa large purple flowers; it was col. # 
lected near Chihu 
ne of the most oseawive of these chaparral-shrubs was the Koeberli-. 
nia, Zuce., calied here Junco, (Gregg.;) a smail, tree rathér than a shrub, 
about 10 feet high, stem 4 to 6 inches in diameter; wood hatd, dark 
brown. with white "jae rte Bos branches green, with a. dark. 
brown. spinous termination, 1 to 2 inches long, and 14 to 2 lines in diam- 
eter; very small subulate leaves soon deciduous; small white flowersin. 
short lateral racemes ; fruit not seen; in flowerin May. It was frequently 
seen from south of Chihuahua to Monterey, (and Matamoros, Gregg.) 3 
We find here again the interesting Chilopsis mentioned above, (see. 
note 11,) also Larrea glutinosa, (note 10,) and,another zygophyllaceous 
shrub, a true Guajacum,*® which aBbears to be an undescribed species ; 
it belongs to those plants that connect the Mexican with the Texan flora, 
as we find it extending from Parras to Monterey, and from there to the 
Upper Colorado, in Texas. Tecoma stans reappeared here with smaller 
pubescent leaves and more alate opie though probably not distinct’ 
froin the larger and smoother plant found below Paso. 
The beautiful Fouquiera spenden. (see note 16,) with its panicles of 
ous ge crimson a 8, rose here above all other shruvs; in some 
stances:it- reached a h eight of from 20 to 30 feet, and perhaps more, al- _ 
age in single. stems. ; 
-A few species of Yucca, together with Opuntia arborescens, (note 5. ? 
formed almost the only trees on the arid plains. But in the valley of the | 
Nazas occur stately trees of a species of Alearobia, dietinte from the A. — 
i Mat of the —— with brendiibtogennd larger seeds, and few or 
no glands on the leav 
About Saltillo aes terensis, sa (B. Lindheimert, Engelm., . 
Guadaloupe and oaade in Texas. The ‘pr dag 
Mateniliane strobiliformis,* ° grows on rocks near Rinconada. Hunne- 
? cd 
*Guajacum angustifolium, n. sp., foliis sub-5 (4-8) jugis glaberrimis, 
foliolig oblongo- linearibus, Le segaan . pedicellis et basi calycis Pe ubescen-— 
tibus ; ovario bilobo, pubescente ; capsula bivalvi, seminibus 2 ovatis. 
“About Parras ; collected "also by Dr. Gregg, who has found Ke plant - 
common from Monclova to Parras, Monterey, and Camargo; found 
we f 
5 or 6 irs, only on ng vigor h oO 
lines et ey to 3 Li ine dee réicultied on "bod sides. Pp 
lines in diameter; seeds llow, of Nag? size of smal 
-° heavy yee sist bro “ Gucjoras” 
A :° Mammillaria strobiliformis, n. sp,'8 pas: ped conics ul eat is 
ao applanatisy sulcatis ;, aculeis rectis. 
