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lected by Dr. W. arrived here in the best condition, arid some ha\’ s > res 
already germinated, so that we may hope to raise some of these specie;f tte 
Yucca aloefolia, of the southern United States and Mexico, is said also ? m 
bear an edible fruit, but has serrulate leaves; we have, therefore, differef all(1 
species of Yucca with edible fruits, which may constitute a peculiar sec 1 '* 1 ® 
tionjn this* genus. * ; * ;w^iiiabt 
The soil appeared to be too fertile here for the production - of JOacti; an#"!- 
with the exception of some Opuntim, the only species collected betwee? 
Paso and Chihuahua, about 100 miles south of the former place, was Ceretfl^r 
which was peculiarly interesting, as it is probably the ifio^n 
Grek 
northern form of Cereus proper. The specimens sent'for cultivation b^uttl 
Dr. W. were unfortunately dead when they arrived here, and neither 
flower nor fruit had been obtained, but Dr. Gregg has collected the samffltaif 
species near Galena, south oi Chihuahua, in flower, from which I comp 
pleted the description. I could not have given it a more appropriate nanph f 
than that of the zealous and intelligent, explorer of those far off regions. |§sof 
learn from Prince Salm-Dyck that a Cereus, probably the same species me w 
was sent to England by Mr. Potts, of Chihuahua, but his specimens alscOntl 
did not live; they were very remarkable for having a thick tiirnip-shapeciicti t 
root. Neither Dr. W. nor Dr. G. having paid attention to the root, Iambi 
unable to say whether their specimens agreed with those of Mr. Potts Mm 
this particular. , jra . \ ^ 
Dr. Wisiizenos was forced to go from Chihuahua westward to Cosihui_ 
riachi. However prejudicial this involuntary interruption of his journey ^ 
may have been to the primary objects of his expedition, it appears that ht 
could ‘’not have selected a more favorable field for botanical researches? 
Amongst the porphyry mountains of Cosihuiriachi and Manos, which® 
vary from 6,000 to*8.000 feet in height, and their deep chasm-like valleys? 
a great many undescribed species of plants were found ; in fact almos? 
everything collected there appears to be new! * 
Among the trees, I mention three species of pines, entirely different Cl 
from those found farther north, but perhaps identical with some specie?^ 
from the Pacific coast. The most magnificent of these three is a specie/^ 
nearly related to Pinus strobus and Pinus flexilis, which I name P. str&Mk 1 
biformis. 2 4 Its size and growth, its foliage, as well as the shape of th( ^ 
----- --pin 
► V 2 3 Cw'eus Greggiij n. sp., erectus, ramosus, pentagonus; areohs distant j 
tibus oblongis, nigro-tomentosis; aculeis nigris, brevissimis, e basi incrasGomni 
sata subulatis, acutissimis, 6-9 radialibus subrecurvis, infimis longioribusafts j 
centrali singulo deflexo minuto; tubo floris elongato, areolis 60-80 cinereo,; e ni( 
tom&ntosis setas 6-12 nigricantes s apice albidas gerentfbus stipato; sepal*#, {? 
interioribus 15-20 et petalis 15-20 lanceolatis, acuminatis, integris. " sracter 
North and south of Chihuahua; flowers April and May. Stem 1 to?. ‘ 
feet high, about 6 lines in diameter; spines \ to 1 line long, extremely - /u 
sharp; flower about 6 inches long and 2 inches in diameter, bristles of th- ,lniS a( 
tube 1^ to 3 lines long; interior sepals reddish green, petals pale purple. T, °r 
platis; 
24 Pinus strobiformis, n. sp., squamis turionum ovatis acuminatis ;va !]s 
ginis laxis, patulis, deciduis; foliis quinis filifomiibiis,»supra albo lineatis^’ 
acute carinatis, subtus convexis, margine’ tenuissime serrulatis; strobil^ 7 C r 
cylindricis, elongatis, squamis obtusis inermibus, denmm recurvis,. '* , 5 
Highest peaks about Cosihuiriachi. The largest pine in this region 01 
