o 
[ 26} 90 
nous, horizontal branches. ‘The plant was here only 5 feet Hist but 
ows about Santa Fe to the height of 8 or 10 feet, and continues to be 
yund as faras Chihuahua and Parras. In the latter more favorable cli- 
mate it grows to be a tree of 20 or 30, and perhaps even 40 feet high, as 
Dr. W. informs me, and offers a most Ipedtutifal aspect when covered wit 
its large red flowers. It is‘ evidently the plant which Torrey and James 
doubtfully, though pintaite © refer to Cactus Bleo HW. B. K. It is nearly 
allied to Opuntia furiesa, Willd., but well paar age from it; and as it 
appears to be tiglase ped. T can give it no more appropriate name than 
O. arborescens,* the tree cactus, or F poe 4 as called by the Mexicans, 
according to Dr. Gregg. The stems of the dead plant present a most sin- 
ar appearance; the soft parts having Sue away, a net work of woody 
fibres remains, formin ng a hollow tube, with very regula rhombic meshes, 
which correspond with the tubercles of the living plan 
he first Mammillaria was also met with on Waguen- age a Species 
hoes related to M. vivipara of the Missouri, and also to the Texan M. 
wosa, (Engelm. in Plant. Lindh. inedit.,) but sibably ot from 
either. Mr. Fendler has 2 ge the same species near San ¢ 
On Wolf creek the curious and beautiful Fadlugia Spore Endl., 
looking like a shrubby Géulke. was found in flower and fruit; also a (new?) 
species of Streptanthus, and an iuteresting Geranium, which I named 
agynum,*® because of its having its five styles only slightly united at 
5 Opuntia arborescens, n. sp., caule ligneo erecto, ramis horizontalibus, 
ramulis cylindricis, tubereulats aculeatissimis ; areolis oblongis, brevissime 
tomentosis, aculeo 0 corneos, stramineo. -vaginatos. teretes undique 
rrectos gerentibus; ram versus apicem floriferis; ovario tuberculato, 
tuberculis sub-20 apice sepala subulata et areolas tomentosas cum setis 
ucis albidis gerentibus; sepalis interioribus 10 to 13 obovatis; petalis 
obovatis, obtusis s. emarginatis; stigmatibus 5 i Fesgevmes bacca flava 
ing ovato-globosa, tuberculata, profun = umbilicu 
eataanmars of New Mexico to Chihu ua, Parras, sat Saltillo; flowers in 
and June; fruit, at least about Santa Fe, ripening the second 
year (Fendler;) in the north 5 to 10, south 20 and more feet high, 5 to 
0 inches in diameter, last branches 2 to 4 inches long; spines of the speci- 
on-mound 20 to 30 in each bunch; further south only 12 
6 Geranium sees » perenne, caule erecto wassignto cum peti- 
olis Speedie. : foliis sinaceeabenanthin inferioribus 7—, superiori- 
bus 3-5-partitis, segmentis inciso-lobatis; pedicellis ec age glanduloso pu- 
bescentibus sciepalis glandulosis, longe ‘atistatis; petalis basi villo brevi 
instructis, ad venas pilosiusculis, obovatis integris; filamentis SC aeeily 
cone glanduloso ; stylis ima parte solum connatis; eapsula gla 
pu 
On Wolf creek, flowers in June. Several stems 1 foot high from a bigs 
lieneous rhizoma; similar to G. maculatum, but easily distitanishen from 
this and most other species by the styles being u united only for dor 2 of 
their length; ‘flowers of the same size, but ariste of sepals much larger; 
leaves only 2 or 21 inches wide. 
