CACTACEH OF THE BOUNDARY. 207 
what contracted at base, nearly 2 inches long; umbilicus about an inch in diameter, flat or a little depressed ; fruit 
dirty purplish, usually with a bright pinnihsil pulp, of an insipid or even nauseous taste. Seeds usually less than 
2 lines, in most specimens only 1.5-1 7 line in diameter, of a regular (from Matamoras) or commonly more irregular 
twisted shape, with an obtuse or acutish, caine narrow margin. Young plants raised from seed are characterized by 
the fascicles of very long (3-1 i fine woolly hairs on the pulvilli, which appear in the second season, and remain 
for several years. Among the numerous varieties of this species, the var. cyclodes, from the upper Pecos, has been 
described in Captain Whipple’ s Pacitic Railroad Report; another one was collected by Mr. Wright on the Limpia, with 
1-6 stout, — spines on the upper pulvilli, and none at all on the lower ones. 
gelow distinguishes from this species another plant, which he has frequently observed near Presidio del 
Norte ee ‘Eagle Pass. From his notes, and from the meagre material on hand, I venture to describe it, without 
asserting its specific difference from the last species. 
LCIS, sp. nov.: adscendens, patula ; articulis obovatis ; pulvillis remotis ; setis fulvis difformibus, exteriori- 
bus sate tenuioribus tresioeiinm subeequalibus, interioribus uniseriatis robustioribus multo longioribus ; aculeis 
2-3 angulatis sepius tortis pallidis deflexis, ssepe cum 1-3 gracilioribus ; bacca ovata late umbilicata pallida; seminibus 
minoribus regularibus anguste marginatis. (Tab. LXXV. fig. 5-7 
suberect, spreading bush, lower and with smaller joints than the last species, and always with a very sweet 
and pleasant-tasted fruit. Plant about 2 feet high; joints } foot long; spines 1-1}? inch in length, almost white. 
A semicircle of short spines or long bristles distinctly separates the spiniferous from the bristly part of the 
pulvillus ; the bristles themselves are much more numerous, finer, and more crowded than in 0. Engelmanni. [49] 
This arrangement of the bristles I find again only in O. chlorotica (Engelmann & Bigelow), from the western 
Colorado. The spines resemble O. tortispina (Engelmann & Bigelow) ; the flower and fruit, O. Engelmanni; and the 
seed seems different from all these Fruit 14-1} inch long, 1 inch in diameter; umbilicus 3 inch wide, shallow. 
Seeds 1.5-2.0 lines in diameter. 
O. occrpentauis, E. & B. in Pac. Rail. Rep., found by Dr. Bigelow “in immense patches forty miles east of 
Los Angeles,” Calon, was also observed by Mr. Schott in the high valleys of San Pascual and Santa Isabel, north- 
east of ‘Gass Diego, “ covering extensive tracts of land.” It is probably a good species, and quite distinct from 
0. ae eee Young plants raised from Dr. Bigelow’s seeds do not show the peculiar capillary spines of that species 
mentioned a 
Another tha grows on the hill-sides and plains near San Diego (Parry), and on the sea-beach there eo: 
An erect plant, 4-6 feet high ; spines 2-4, stout, compressed, yellowish or brownish, also forming large thickets; join 
6-8 inches long and 4-6 inches wide ; ovary subglobose, with 16-20 bristly pulvilli; 15-18 broadly obovate ae 
sepals ; about 8 (2) orbiculate petals ; 8-10 stigmata ; a large yellowish or purple fruit, of pleasant taste, much relished 
inhabitants Whether this is a form of 0. Engelmanni, or O. Ficus Indica,— which, from having for a i 
while been cultivated about the settlements, may have become naturalized, —I cannot at present determine. 
O. MACROCENTRA, sp. nov. : adscendens ; articulis magnis suborbiculatis tenuibus sepe eretacenets ‘ 
foliis gracilibus lineari- puiliulatia’s palviltie subremotis orbiculato-ovatis setas graciles eee fulvas tomentum 
vix superantes gerenti us plerisque inermibus, summ mis et marginalibus solum armatis ; aculeis 1-2 rarius plistbas 
prelongis rectis seu varie flexuosis fusco-atris sursum pallidioribus sepe annulato-nota oti superiore terete inferiore 
subbreviore = seu canaliculato; flore flavo; ovario ovato; pulvillis 20-25 villosis et fulvo-setosis versus 
superiorem ovarii partem congestis ; sepalis tubi 13 lanceolatis seu interioribus obovatis acuminatis cuspidatisve ; 
petalis sub-8 — obtusis mucronatis; stigmatibus 8; seminibus majusculis late obtuseque undulato-marginatis. 
(Tab, LXXYV. fig. 8. 
Sandy elon in the bottom of the Rio Grande near El] Paso, also on the Limpia (Wright). Flowers in May. 
A remarkably sisiking plant, 2-3 feet high, with large, almost rounded, thinly compressed, often purplish joints, BE 
very long nearly black spines, of which it would be very desirable to obtain living plants, as none of those sent home 
by Mr. Wright have survived. Joints 5-8 inches long, 4-7 inches wide ; leaves 24-3 lines long, remarkably slender ; 
pulvilli #-1 tabh apart, lower ones smaller and closer together, unarmed ; spines on the upper ones 2-3 inches long, 
lower half almost black ; ovary 1} inch long, 8 lines in diameter ; flower 3 inches in diameter when fully open. The 
seeds sent by Mr. Wright as belonging to oy — are 2,0-2.2 lines in diameter, much twisted, their border undu- 
lating, very similar to seeds of some form o O. pheacantha. From this species our plant seems to be distinguished by 
its larger, thinner, more orbicular joints, pe closer and more woolly pulvilli, the slenderer leaves, and the small 
number of very long spines ; the ovary also is more elongated, the sepals narrower, the flower larger. 
5. O. pH#acantHa, E. in Plant. Fendl.: diffusa, adscendens; articulis obovatis seu Sana crassis 
oes foliis e basi crassa subulatis ; pulvillis subremotis orbiculato-ovatis setas graci mineas 
tomento griseo plerumque longiores gerentibus plerisque armatis; aculeis 2-5 eee arco [50] 
‘erence porrecto, ceteris brevioribus inequalibus plus minus angulatis seu compressis deflexis fuscis seu 
