48 
a near relative of 7. cyathophora. Here, for the first time, Berberis 
trifoliata, Moric., was met with, which appears to inhabit the 
whole middle and lower valley of the Rio Grande, as we find it 
again in this collection from Monterey, and Mr. Lindheimer has 
sent beautiful specimens from the Guadaloupe, in Texas. 
_ Echinocerei and Echinocacti appear in greater abundance. 
The re-discovery of the beautiful Achinocereus pectinatus (Lchi- 
nocactus pectinatus, Schiede., EL. pectiniferus, Lem., Echinopsis 
pectinata, Salm, in part) is peculiarly interesting, as it furnishes 
the means of proving a Texan species, which has been con- 
founded with it, to be entirely distinct. The description of the 
plants (which died without producing flowers), found in several 
works, as well as in the latest publication on Cactacea, betore 
me, of Foerster, Leipzig, 1846, was made, as Prince Salm in- 
formed me, from specimens sent from Chihuahua by Mr. Potts ; 
it entirely agrees with my specimen from the same region. But 
the description in Foerster’s work of the flower of a specimen in 
Cassel, flowering in 1843, (not known from where obtained,) shows 
that to be identical with a Texan species, common between the 
Brazos and Nueces rivers, which I have described in Engelmann 
and Gray’s Plante Lindheimeriane, Boston Journal of Natural 
History, vol. v. p. 247, under the name of Cereus caespitosus, 
and which should now be named JZchinocereus cespitosus. 
Echinopsis pectinata, 8. levior, Mony., and x. Reichenbachiana, 
Salm, are perhaps forms of this Texan plant, which varies consi- 
derably in its native country. Dr. Wislizenus has sent me a 
living specimen and dried flowers of Z. pectinatus; unfortunately 
the plant met with a similar fate to those sent to England by 
Mr. Potts, and there is none now in cultivation, if I am correctly 
informed ; but I preserve the dried specimens in my herbarium, 
and have been enabled to draw up from it the description. 
Near San Pablo another Echinocereus was found, and dried 
flowers, as well as living specimens, have safely arrived here. A 
large Echinocactus was collected near Pelayo; unfortunately no 
flowers were seen; but the specimen brought to St. Louis 1s so 
far in fine condition. Of another smaller, but most elegant 
species of the same genus, Dr. Wislizenus collected the living 
plant and flowers, and Dr. Gregg the ripe fruit. It is distinct 
from the other ehinocacti found in those regions by the mem- 
branaceous very thin sepaloid scales on the tube of the flower, 
and the juicy glabrous fruit, in which respect it resembles my 
E. setispinus from Texas; F. Texensis, Upfr., has a juicy fruit, 
covered with woolly and spiny scales; 2. Wislizeni and others 
ES have a dry fruit, covered with hard scales. 
