CACTACEA. OF THE BOUNDARY. 218 
Throughout all the Sierras in western Sonora, named by the inhabitants “ Vela de Cojote,” whence the specific 
name; which, however, would be just as appropriate for most other cylindric Opuntie, which are often visible for 
several miles when the sun strikes the glistening sheaths of their spines. Flowers in July and August. — Stems 
5-12 feet high, flexuous with few divaricate branches ; joints clustered at their ends, 3-8 inches long and often 
2 inches in diameter, “dull-grayish, inclined to olive ;” tubercles ovate-elongate, 6-7 lines long ; leaves thick and 
only about 1 line Saale ; spines almost equal in length (1-1} pass stellate and not much deflexed, completely hiding 
the surface of the young joints ; ovary about 10 liek long. Flower cup-shaped, mostly less than an inch in diameter, 
Fruit a plump fleshy berry, oval, rounded, not or only slightly sabikeauties 1-1} inch long, a little less in diameter, 
and entirely spineless ; characterized by the large white tomentose pulvilli, Seeds 1-1} line in diameter, or with the 
k often 2 lines long, much compressed, and thin and very angular, often oddly ened: The fruit is not rarely 
sterile and proliferous, and becomes pendulous from the weight of the young sprouts attached to it. 
21. O. Wuipptel, E. & B in Pacif. Rail. Rep., var. 8. sprvostor: elatior, erecta ; articulis cylindricis ; tuber- 
culis ovatis confertis ; pulvillis parce tomentosis, vix setosis ; “aculeis 12-14 stramineo-vaginatis aie aaitlge = 
rubro; ovarii ovati tuberculati pulvillis 20-30 albo-tomentosis setas stramineas et acu S$ paucos eci 
gerentibus ; sepalis 8 orbiculatis —- petalis 8-10 spathulatis cuspidatis ; bacca Facies reat serie oi 
inermi ; seminum commissura lin 
m the Gila south to the fee Cruz River and ite and farther east (Schott). Flowers in Jun 
Stems a0 feet high ; joints 4-12 inches long, 3-3? inch thick, covered with ovate or rather rhombic uae ; [58] 
spines much more numerous in 1 this variety than in as original form, found by Dr. Bigelow farther north, 
6-9 lines long. Flowers 1}-14 inch wide, — Seeds nearly 2 lines in diameter, larger shih in the northern 
form, with a very sharply ies ss linear commissure. 
22. O. ARBORESCENS, E. in Wisliz. Rep. : caule arborescente erecto reticulato-lignoso ; ramis verticillatis hori- 
zontaliter divergentibus seu pendulis ; articulis verticillatis plerumque ternis quaternisve cylindricis perviridibus ; 
tuberculis elongatis cristatis; foliis teretibus elongatis patulis; pulvillis ovatis pulvinatis breviter tomentosis vix 
setosis ; aculeis 8-30 corneis seu fuscis stramineo-vaginatis nan a Py cas 1-8 paged Jongioribus 
laxius vaginatis, centrali sub-deflexo, exterioribus debilioribus arcte vaginatis ; flore purpureo magno; ovarii subglobosi 
ween ae 20-25 breviter tomentosis setas minutas et Ce olos panWon erectos deciduos Boe thae ; sepalis 
tubi vatis obtusis medio virescentibus margine purpureis ; ‘ aga 10-12 obovatis obtusis retusisve ; filamentis 
Se ans ; diniaeies 8; bacea globosa seu hemispherica tuberculis prominentibus cristata late umbilicata inermi 
subsicca flava ; seminibus regularibus anguste commissuratis ; pf incumbentibus seu rare obliquis. 
(Tab. LXXV., fig. 16-17. 
This species . from the upper waters of the Arkansas and the Platte rivers deep into Mexico, and from the 
plains east of the Llano Estacado (200 miles east of the Pecos) to Zui, 150 miles west of the Rio Grande, about 
15 degrees of latitude and 8 of longitude. Flowers in May and June. — North and east this species is only about 
5 feet high, but farther south it is said to become 20 or 30 feet high; even the old trunks continue greenish and 
spiny. The massive ligneous skeleton is always characterized by the elongated-rhombic meshes and the verticillate 
insertions of the branches ; in very old specimens the cavity of the tube and the meshes become almost obliterated by 
the filling in of ligneous layers. The roots are often somewhat tuberous by a swelling of the fibres. Joints 2-6 inches 
long, ne than an inch in diameter; tubercles heehee omnes elevated, 7-9 me long; leaves 6-10 lines long, 
hardly a line in diameter. Spines very variable in number and size ; sometimes we find only 8~12 spines, not half an 
inch long, so that the plant from a distance appears spineless, but more frequently 20-25 or even more spines occur, 
the longest middle ones deflexed, and 8-10 or rarely 12-14 lines in length, other spines spreading all around, 4-8 lines 
long. The beautiful purple flowers are 23-3 inches in diameter, and often profusely cover the tree; the stigmata have 
a length of 3 or 3} lines. The fruit is about an inch long in all dimensions ; umbilicus wider or = shallower 
r deeper, according to the greater or smaller prominence of the upper tabereles of the fruit. Seeds 14-2 lines in 
diameter, usually of a regular shape, with little or no beak ; the commissure distinct, and between 0. : i 0.2 line 
broad’; cotyledons ahiioat always regularly incumbent, rarely somewhat oblique. Sometimes 3 cotyledons are 
atierved in the seeds of this species, as is also the case in many others. 
23. O. MamiLLATA, A. Schott in litt. : caule arborescente reticulato-lignoso divaricato-ramosissimo ; articulis 
ovato-cylindricis crassis abbreviatis retusis perviridibus ; tuberculis ovatis tumidis prominentibus ; foliis ovatis 
abbreviatis cuspidatis ; pulvillis ovatis ou ae setas brevissimas seu nullas gerentibus ; aculeis 4-6 gracilibus 
revibus arcte vaginatis = plerisque deflexis; flore parvo purpureo ; ovarii ovati pulvillis 18-24 pulvinatis 
albo-tomentosis ; sepalis tubi sub-8 orbiculatis ; re late obovatis abbreviatis ; filamentis exterioribus 
dilatatis (atexitibvas 2; igiuakis 7-8 erectis ; bacca ovata plane entwomdy pci magnis albo-tomen- [59] 
tosis inermibus meet seininibus parvis angulatis vix rostratis anguste commissuratis valde compressis. 
(Tab. LXXV. fig. 1 
