FROM MISSOURI TO SANTA FE AND NORTHERN MEXICO, 55 
collections are very full. Fortunately, Dr. Gregg accompanied the same expedition, and also made 
rich collections in that almost unknown region, iehieh we may consider as the southwestern limits 
of the valley of the Rio Grande. 
Before going into detail, I will only remark here, what a reference to the map and sections will 
more fully present, that the country between Chihuahua and Parras has a general elevation of from 
4,000 to 5,000 feet; between Parras and Saltillo it rises from 5,000 to 6,000 feet, and thence it 
rapidly descends towards the lower Rio Grande. 
South of Chihuahua a curious leafless Euphorbia was collected, with tuberous roots and leafless 
stem ; nevertheless apparently a near relative of HZ. 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 rediscovery of the beautiful 
Echinocereus pectinatus (Echinocactus pectinatus, Scheidw., E. pectiniferus, Lem., Echinopsis pectinata, 
Salm, in part) is peculiarly interesting, as it furnishes the means of proving a Texan species, which 
has been confounded with it, to be entirely distinct. The description of the plant (which died 
without producing flowers) found in several works, as well as in the latest publication on Cactacee, 
before me, of Foerster, Leipzig, 1846, was made, as Prince Salm informed me, from specimens sent 
from Chihuahua by Mr. Potts, It entirely agrees with my specimen from the same “— 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, [110 (26)] 
common between the Brazos and Nueces rivers, which I have described in Engelmann 
and Gray’s Plante Lindheimeriane (Boston Journal of Natural History, V. p. 247) under the name 
of Cereus caespitosus, and which should now be named Echinocereus caspitosus. Echinopsis pectinata, 
B. lavior, Monv., and y. Reichenbachiana, Salm, are perhaps forms of this Texan plant, which varies 
considerably in its native country. Dr. Wislizenus has sent me a living specimen and dried flowers 
of FE. 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 
specimen in my herbarium, and have been enabled to draw up from it the description.” 
45 EcHINOCEREUS PECTINATUS mihi (Echinocactus pectinatus, Scheidw.; E. pectiniferus, Lem.): simplex (an 
Semper ?), ovato-cylindricus, 23-costatus ; areolis elevatis, linearibus, approximatis, junioribus albo-villosis ; aculeis 
radialibus 16-20 subrecurvis, adpressis, pectinatis, albis, apice roseis, superioribus inferioribusque brevioribus, laterali- 
bus longioribus ; centralibus 2-5 brevissimis, uniseriatis ; tubo floris pulvillis 60-70 brevi-tomentosis aculeos albos 
8. apice roseos 12-15 gerentibus stipato; sepalis interioribus 18-20 oblanceolatis ; petalis 16-18 oblongis, obtusis, 
eroso-denticulatis, mucronatis. 
Bachimpa, south of Chihuahua ; flowers in April. Stem 7 inches high, below 3}, above 2} inches in diameter; 
upper and lower spines 2 lines, lateral 4 lines long ; central spines mostly 3, sometimes 2, and below as much as 5, in 
one vertical row, $ to 1 line in length. Flowers about 3 inches long and wide ; red or purple spiny bristles on the 
tube 2 to 3 lines long, the uppermost 3 to 5 lines long, only 3 to 5 together. 
It will not be amiss to introduce here again a more complete and correct description of its Texan relative. 
EcHINOcEREUSs casPrtosus mihi (Echinopsis pectinata, auctorum partim; Cereus caspitosus, Engelm., Lc.) : 
ovatus, caespitosus, 13-1 18-costatus, areolis elevatis, linearibus, approximatis, junioribus albo-villosis ; aculeis radialibus 
20-30 subrecurvis adpressis, pectinatis, albis (nonnunquam roseis [castaneis}], Lindh.) superioribus inferioribusque 
brevioribus, Siasiicas Gow longioribus, centralibus nullis ; tubo floris pulvillis 80-100 longe cinereo-villosis setas apice 
8. totas fuscas s. nigricantes 6-12 gerentibus, stipato; sepalis interioribus 18-25 oblanceolatis integris s. denticulatis ; 
petalis 30-40 obovato-lanceolatis, obtusis, acutis, s. mucronatis, ciliato-denticulatis ; stigmate viridi infundibuliformi, 
13-18-partito ; bacca viridi ovata, perigonio coronata, villosa, setosa, demum nudata; seminibus obovatis tubercu- 
- 
From the Brazos to the Nueces, in Texas, Lindheimer ; flowers in May and June. Generally 1 to 2 inches high 
and of nearly the same diameter, rarely as much as 5 or 6 inches high and 2 to 3} edit in diameter ; longer lateral 
