60 UNITED STATES AND MEXICAN BOUNDARY. 
ramulis (saepe?) in spinas abuentibus ; foleis geminis vel teenis pinnatis, petiolo cammuni 
exalato supra canaliculato, foliolis 4—7-jugis minimis (1 lin. long.) suborbiculatis late ovali- 
busve obtusis subcoriaceis ; staminibus petalis longioribus. On the Colorado, near Fort Yuma; 
Schott. This is an interesting addition to our Flora, being an undoubted native Parkinsonia, 
entirely distinct from P. aculeata, and much more nearly related to P. Africana, Soud. (in Lin- 
nca, 23, p. 38.) We have seen no specimens showing the inflorescence but only a few loose 
flowers from the collections of Mr. Schott. From the fructiferous specimens it would appear 
that the racemes are fewer-flowered and the pedicels shorter than in P. aculeata, The flowers, 
too, are smaller, the stamens much more exserted, and the petals (except the vexillum) are 
ovate, not roundish, as in that species. The pods are nearly the same in both. These vary 
from 2 to several-seeded, and are constricted between the seeds with a very long acumination. 
CAE3ALPINIA PULCHERRIMA, Swartz; Torr. & Gray, Fl. 1, p. 397. Ures, Sonora, October ; 
Thurber. | 
ALGAROBIA GLANDULOSA, Torr. & Gray, l. c. p. 399; Gray, Pl. Wright. 1, p. 60. Sandy soils 
along the Rio Grande and its tributaries and in the Mexican States. Common. on the bottom 
lands of the Gila. This is the celebrated mesquite, so often noticed in the reports of western 
exploration. Dr. Gray (1. c.) suspects that it may be united (together with P. dulcis and P. 
Siliquastrum) to P. juliflora. It affords а gum nearly equal to gum arabic, of which it stated 
that large quantities have lately been sent to San Francisco from Mexico. 
STROMBOCARPA PUBESCENS, Gray, Pl. Wright. p. 60; Torr. Pacif. R. Road Expl. 6, p. 360, t. 4. 
Valley of the Rio Grande from New Mexico, 20 miles below San Elceario; Bigelow. Bottom 
lands of the Rio Gila and R. Colorado. The Screw-bean or Screw-mesquite of American travel- 
lers and Tornillo of the Sonorians. 
STKOMBOCARPA CINERASCENS, Gay, l. c. p. 61, adnot. Boggy places, Fort McIntosh, and other 
places on the Lower Rio Grande, May, November ; Schott. The thorns are variable in length, 
being sometimes longer, sometimes much shorter than the leaves. Pods like those of S, pubes- 
cens, except that they are a little thicker. 
NEPTUNIA LUTEA, Benth. in Hook. Torr. Bot. 4, 6. 356. Painted Caves, and near Eagle Pass, 
western Texas, June; Bigelow, Schott. In our specimens the fruit is sessile, while it is stipi- 
tate in the Florida plant. ; 
DESMANTHUS VELUTINUS, Scheele in Linnea, 21, р. 456; Gray, Pl. Lindh. 2, p. 183. Hills at 
the Copper Mines, August; Bigelow. Common near Eagle Pass; Schott. 
DESMANTHUS JAMESII, Torr. Ё Gray, F'l.1, p. 402; Gray, Pl. Wright. 2, p. 63. Gravelly hills 
along Rock Creek ; and rocky places at the шээс Mines. July, (in flower,) August, (in fruit) ; 
Bigelow, Parry. 
MIMOSA rRAGRANS, Gray, Pl. Lindh, 2, p. 182; & Pl. Wright. 1, p. 61. Head of the Rio San 
Pedro; Bigelow. Eagle Pass, April—June ; Schott. 
МїмозА Вокклив, Gray, Pl. Fendl. p. 39, Ф РІ, Wright. l. c. Plains near Live Oak Creek, 
September, (in fruit); Bigelow. 
Mimosa LINDHEIMERI, Gray, Pl. Lindh. 2, p. 181. Rocky and gravelly hills and ravines, 
July ; Bigelow. 
„ > MIMOSA DYSOCARPA, Benth. in Gray, Pl. Wright, 1, p 62. On the Cibolo of the Rio Grande 
and Rock Creek ; also hills at the Copper Mines, July—August ; Bigelow. 
Mimosa MALACOPHYLLA, Gray, Pl. Lindh. 2, p. 182, adnot., & Pl. Wright. 1, p. 163. Rocky 
(es ы GALS Дээс» 226 2⁄4— ge 
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