113 
[26] 
' Gr %sBy much branched, often with remarkably small leaves, and pot rarely 
h ecbb * e ^ ru ^ ts * Among them many rhamnaceous and celastraceous 
De °niie;shrubs, and some Euphorbiaceae, were particularly conspicuous, as well 
%i»ome Mimoseae , one of which I must not forget to mention, because it 
fed wi(nIs*perhaps the smallest shrub in this family; not more than one or two 
covereiiMhes high,with diminutive leaflets, but large purple flowers; it was col¬ 
lected near Chihuahua. 
i had b-r One of the most offensive of these chaparral-shrubs was the Koeberli- 
louper ma, Zucc., called here Junco, (Gregg.;) a small tree rather than a shrub, 
nu l a txi^M? ^ .^ eet high, stem 4 to 6 inches in diameter; wood hard, dark 
with white alburnum; terminal branches green, with a dark 
ftfo brown spinous termination, 1 to 2 inches long, and to 2 lines in diam- 
•elongij €ter ’> vel T small subulate leaves soon deciduous; small white flowers in 
ether ^toral racemes ; fruit not seen; in flower in # May. It was frequently 
aegrn(;iii 7 een from ^ °f Chihuahua to Monterey, (and Matamoros, Gregg.) 
is easil; here a § a i n the interesting Chilopsis mentioned above, (see 
it. has $ < no * e 11>) also Lctrrea glutinosa , (note 10,) and another zygophyliaceous 
shrub, a true .Quajacum** which appears to be an undescribed species; 
ibimdanci !t b ? lo 5^ x ? those Plants that connect the Mexican with the Texan flora, 
rrpsecolojlf We ^ ext ending from Parras to Monterey, and from there to the 
m j stp ,: Upper Colorado, in Texas, Tecoma stems reappeared here with smaller 
lFfevi®( b ? scen ^ ^ eaves and more alate petiole, though probably not distinct 
tbe * ar £ er smoother plant found below Paso, 
peciesi t ^ be beautiful Fouquiera splendens, (see note 16,) with its panicles of 
tubular crimson flowers, rose here above all other shrubs ; in some 
0 "Instances it reached a height of from 20 to 30 feet, and perhaps more, al¬ 
ways in single stems. 
A few species of Yucca, together with Opuntia arborescms, (noted,) 
fcxmed almost the only trees on the arid plains. But in the valley of the 
i nuiiw# azas 0CCl * r stateI y trees of a species of Algarobia, distinct from the A. 
km i§ landulosa of .the north, with broader legumes, larger seeds, and few or 
5 Jp: glands on the leaves. 
2TJ, About Saltillo Echinocactus tegensis, Hpfr., (E. Lindheimeri, Engelm., 
12 line ^ ant * M nc th* 1. c.,) was found, which extends from here to Mata- 
. pi° ros j an d to the Guadaloupe and Colorado, in Texas. The pretty 
have I W ammiLlaria strobiliformis, 5 ® grows on rocks near Rinconada. Humie- 
Loreti - ----- 
M °m>Guajacum angustifolium ., n. sp., foliis sub-5 (4-8) jugis glaberrimis, 
WG ■f obs oblongo-linearibus, reticufatis; pedicellis et basi calycis pubescent- 
r > Sl ^bus; ovario bilobo, pubescente; capsuia bivalvi, seminibus 2 ovatis. 
, em!i < About Parras; collected also by Dr. Gregg, who has found the plant 
lant,summon from Modclova to Parras, Monterey,; and Carhargo; fottnd by 
form Mr. Lindheimer on the Pierdenales river in Texas ’flowers in April and 
roove May. Shrub or small tree with very knotty branches; leaflets mostly in 
:eola,l5 or 6 pairs, only on young vigorous shoots 6 to 8 pairs, mostly only 4 
i emb| lines long, to I line wide, reticulated on both sides. Purple flowers 6 
y Dr. lines in diameter; sdeds yellow, of the size of small beans. The hard 
and I and heavy yellowish brown wood is called “Guajacan 5? about Saltillo, 
ad, wi and used as a sudorific and in venereal diseases, (pr. Gregg.) 
^ \ B * Alam,miliaria strobiUforrnis, n, s p, simplex ovato-conica, tuberculis 
r ell Mhibricato-adpressis, conicis, applanatis, sulcatis; aculeis rsetis radialibus 
MjLCrf- Us 
7 % 
