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Zygophyllaceae^ more abundant farther south. In the same neighborhood II 
the mezquite tree or shrub was first met with., probably Algarobia glandu-W 
losa, T. and G. From here the mezquite was abundantly found down to H 
Matamoros, but the specimens collected appear to indicate that there are at I 
least two different species. 
On the next day, near Sabino, an interesting bignoniaceous shrub was t 
collected for the first time, undoubtedly the Ohilopsis of Don, which %\ 
farther south appears more abundantly. Its slightly twining branches,, 
willow-like slender glutinous leaves, and large paler or darker red flowers, i: 
render it a very remarkable shrub. Dr. Gregg mentions it under the name ! 
of “Mimbre” as one of the most beautiful shrubs of northern Mexico. I 
The character given by Don, and that of Decandolle, appear defective, 1 
though I cannot doubt that both had our plant in view. From the very f 
complete specimens obtained both by Dr. Wislizerms and Dr. Gregg, I am | 
enabled to correct those errors. 11 
Wear Albuquerque a curious Opuniia was observed; it evidently belongs 
to Opuntiae cgtmdraceae , but has '.short clavate joints, which make the ! 
vosis, coriaceis, adpresse pilosis glutinosis.; floribus inter folia opposita j 
solitariis; fructu 5-cocco villoso. 
Common from Gila and Fray Cristobal, in New Mexico, to Chihuahua 
and Saltillo; also about Presidio, (Dr. Gregg $ flowers in March and April; 
fruit ripe in July. Shrub 5 to 8 feet high, very much branched, very glu¬ 
tinous; used as a sudorific and diuretic, and called gobernadora, or in the 
north guamisj according to Dr. Gregg. Leaflets 3 to 6 lines long and half 
as wide, cuspidate or mucronate; ovary 5 celled, each cell with 3 or 4 
ovules; fruit 3 lines in diameter, globose, attenuated at base; seeds by 
abortion only one in each eel4 falcate, smooth, shining. 
1 .1 Chilopsis Don, char, emend. Calyx ovatus plus minusve bilobus, 
lobo altero breviter 3, altero 2 dentato; corolla basi tubulosa, curvata, fauce 
dilajLata, companulata, limbo 5-lobo, crispato-crenato; stamina 4 fertilia 
didynama, antherarum nudarum lobis ovatis, obfusis; quintum sterile bre- 
vius nudum; ovarium ovatum; stylus filiformis, stigma bilamellatum; cap- 
sula siliquaefornais, elongata,. bilocularis, septo cohtrario placentifero ; 
semina transversa margine utroque comosa. 
An erect Mexican shrub, 8 to 12 feet high, ends of branches often 
slightly twining; branches smooth, and glutinous or rarely woolly ; lower 
leaves somewhat opposite, upper ones sparse, lanceolate-linear, long-acu¬ 
minate, glabrous or glutinous;; racemes compound, terminal* pubescent; 
pedicells bracted, corqljs rose-colored or deeper red or purple. 
Along water-courses or in ravines, from Sabino, near Albuquerque to 
Chihuahua, Saltillo and Monterey. Leaves 2 to 4 inches long, 1 to 3 lines 
wide; flowers 1J to inch long; fruit 6 to 10 inches long; seeds with 
the coma 6 lines long. 
There are perhaps two-species—one from the neighborhood of Saltillo, 
with larger,, paler flowers* broader, not glutinous leaves, and woolly 
branchlets, perhaps the Oh. saligna lJon; the other from New Mexico and 
Chihuahua, with longer, narrower glutinous leaves, perfectly glabrous, 
glutinous branchlets, and darker and smaller flowers; may be Oh. linearis , 
DC., or a new species, Oh. glutinosa . The Calyx is variable in both. 
