. 294 ADDITIONS TO THE CACTUS-FLORA OF THE UNITED STATES. 
stigmas 6-7. The locality is about 5 degrees north of the place where Dr. Bigelow, and afterward Dr. Newberry 
found the plant. 
5. CEREUS VIRIDIFLORUS, Engelm. Evidently the most northern Cereus, found as far north as the Laramie 
region, and not rare in Colorado, par tats it occurs 1-3 inches high, mostly with 13 ribs, and with the greatest variability 
in the color of the radial spines and in the presence of the 1-2 central ones. 
C. Enegetmannt, Parry. In the Salt Lake Desert, far to the northwest of the country where it was 
originally discovered. Always characterized by the cruciate central spines. 
7. OPUNTIA SPHZROCARPA, Engelm. & Bigelow. Var.? Uvanensis: diffusa; articulis orbiculato- 
obovatis crassis, junioribus seepe globoso-ohovatis vix tuberculatis ; areolis subapproximatis ; foliis pera [200] 
subulatis divaricatis ; setis brevissimis, aculeis nullis seu parvulis seu rarius singulo longiore recto robus 
albido ; floribus sulphureis ; sepalis exterioribus transversis obcordatis cuspidatis ; petalis 8 late obovatis aiiaeciills ; 
stigmatibus 8 brevibus erectis; bacca obovata areolis sub-25 stipata; seminibus irregulariter compressis anguste 
marginatis. 
the Pass, west of Steptoe Valley, in the Utah basin. In flower and fruit at the end of July. — Joints 
2-3 inches long and of nearly the same diameter ; areola 6-8 lines apart ; leaves smaller than in any other of our 
species except O. basilaris, scarcely 1 line long; bristles few on young, none on old joints, about 4 line long ; stouter 
spines, when present, 7-1 inch long. Flowers 3 inches in diameter, pale or sulphur-yellow. Fruit 1 inch long, half 
as thick, with a very deep umbilicus, and with a few bristles, or here and there a minute spine on the areole ; in the 
specimens before me ged fleshy, but perhaps dry at full maturity. Seeds very irregular, 2 lines or in the 
longest diameter 2} lines w 
Loth to increase the seastis of ill-defined species, I provisionally attach this to the New Mexican O. sphero- 
carpa, of which, however, leaves and flowers are as yet unknown, and the fruit is rather different. 
8. O. HysTRICINA, Engelm. & Bigelow, is evidently a western representative or may be a western form of 
O. Missouriensis. (See Bot., Ives’s Exped., p. 14.) It was collected in the present Territory of Nevada, between 
Walker and Carson rivers. Flowers 23-3 inches wide, larger than in Dr. Newberry’s specimen; stigmas 8-10, 
short, erect. 
. O. Missourrensis, DC. , itself is not rare in the deserts between Salt Lake Valley and Rush Valley. Var. 
ALBISPINA, approaching to var. trichophora, was found on Smith Creek, Lookout Mountains. Flower 3-34 inches in 
eter ; ovary with 20 or 25 scarcely spiny areole ; 5 very short erect stigmas. 
10. O. FRaciiis, Haw. Suppl., p. 82. Cactus fragilis, Nutt., Gen. I., p. 296. Fort Kearney to the North 
Platte country. In flower in June and July. — This, I believe, is the first time, since Nuttall’s discovery in 1813, that 
the flowers of this species were collected. Travellers report the plant very common on the sterile prairies at the foot 
of the Rocky Mountains, but rarely found in flower, and still more rarely in fruit. It seems to propagate principally 
by the extremely brittle joints, which even the wind is apt to break off and carry about. I have had for many years 
specimens in cultivation, brought by Dr. Hayden, but have never been able to obtain flowers. Nuttall says 
the flowers are solitary and small, —in the specimen before me they are nearly 2 inches in diameter, pale [201] 
yellow ; ovary 8-9 lines long, with 13-15 areol, densely covered with white wool, the upper ones with a few 
white spines ; lower sepals broadly oval, with a short cusp ; petals 5 obovate, roundish, crenulate; style longer than 
stamens ; stigmas 5, short, cuspidate, erect. 
11, O. PULCHELLA, sp. nov.: parvula, diffusa; articulis obovato-clavatis leviter tuberculatis ; foliis minutis e 
basi ovata subulatis; areolis acuta: superioribus aculeos albidos rectos, singulum longiorem complanatum por- 
rectum seu deflexum, cseteros brevissimos radiantes subiatinds: ; floris purpurei ovario areolis 13-15 albo-villosissimis 
et aculeoligeris dense stipato ; sepalis inferioribus lineari-oblongis breviter cuspidatis, superioribus cuneato-spatulatis ; 
petalis 8 obovatis obtusis ; stylo cylindrico exserto, stigmatibus 5 linearibus suberectis 
Sandy deserts on Walker River, Nevada. Flowers in a une. — This is one of shen smallest and prettiest species of 
the genus, and belongs to the section Clavate (Synops. Cact., p. 46). It is readily distinguished from its allies by the 
small joints and purple flowers. Joints 1-1} inch long ; rae scarcely 1 line long. Flower bright purplish-red or 
deep rose-red, 1}-1} inch in diameter ; ovary 4-5 lines long, beset with white bristly spines, 15-25 on each areola ; 
style not ventricose in the lower half, as is usual in this genus ;4 stigmas slender, pale yellow. 
4 Another deviation from the usual form I observe in the style of O. coccinellifera. From a very narrow and short base 
it is suddenly dilated five or six times its diameter, and then gradually contracts upward, 
