CACTACE., 41 
9. Op. TORTISPINA (sp. nov.): prostrataarticulis majusculis adscendentibus obovato-orbiculatis + 
pulvillis subremotis stramineo s. fulvo-setosis ; ; aculeis 3-5 majoribus compressis angulatis. 
subinde caualiculatis seepe spiraliter tortis, albis basi apiceque szpe corneis, sieve! infra 
aculeolis 2~3 gracilibus albis; flore ; bacca ovata areolis sub-20 parvulis notata, late 
umbilicata, seminibus mujusculis regularibus crassis. (Plate V/fig 2-3. xx#% 7- 
On the Camanche plains, near the Canadian river, east of the plateau of the Llafio Estacado. 
Similar in growth to the more western O. Camanchica. Joints rounded, 6-8 inches long ; 
pulvilli 1-13 inches apart; bristles short, except on the edges, where they are 2-3 lines long, 
but rather slender ; spines more numerous than in any other of our species, with juicy fruit, 
often 6-8, lower smaller ones 4-1 inch, larger ones 14-24 inches long, entirely white or yel- 
lowish horn-colored at base and tip ; on the upper areol one erect spine, the others spreading 
in different directions, lower ones deflexed. Fruit similar to that of last species, large, oval, 
not contracted at base, perhaps less juicy and with a somewhat smaller and deeper umbilicus, 
1}-2 inches long, 1-1} in diameter. Seeds 2-3 lines across, thick and quite regular, with a 
very slight indentation at the hilum. 
i had observed that sometimes 2 plants are produced from the same seed ; this I found to be 
the case occasionally with Opuntia occidentalis, Engelmanni and dulcis, one of the young 
plants always much larger and more vigorous than the other. In examining different seeds of 
this speceis, I fiveveded in finding one with two embryos (see figure), one spirally coiled 
around the other, both together appearing like one large one. te XK, ff 4 —L— 
10. Op. Rarinesqui, Engelm. : diffusa,radice fibrosa, articulis mediis s, majusculis obovatis s. 
pec aaa per-viridibus ; foliis subulatis elongatis patulis,pulvillis sub-remotis albido-s, gri- 
eo-villosis setas graciles rufas demum elongatas gerentibus plerisque inermibus ; aculeis paucis 
aetiiions solum marginalibus validis teretibus rectis albidis swpe basi apiceque rufescentibus 
erectis s. patulis, singulis s. uno alterove graciliore deflexo adjecto; floris alabastro conico 
acuto, ovario clavato pulvillis 20-25 griseo-villosis rufo-setosis instructo; sepalis tubi sub-13 
oblanceolatis acuminatis, interioribus late petaloideo-marginatis benpiatin petalis 10-13 late 
obovatis ardag-denigélatis sab-‘marginatis sulphureis basi intus miniatis, stigmatibus 7-8 erectis 
adpressis fla@vo-albidis; bacca ovata basi angustata clavata subnuda pulposa purpurascente, 
umbilicoinfundi._) buliformi sere : ‘seminibus Hscepgsheame: ard peso ia margine plerumque 
lato compresso sub-acuto. nibus minoribus regularibus 
angustius marginatis. aide xt fig. aS) \R XKM, PF 
In sterile, sandy, or rocky (consisting as well of sandstone as of limestone) localities in the 
Mississippi valley, Illinois, Missouri, Arkansas, and north to Wisconsin, east to Kentucky, and 
south, probably, to Louisiana and Texas; westward it has not been found west of the western 
boundary of Missouri and Arkansas. Flowers in May and June; fruit ripens in the same 
season, but remains on the plant till the following spring. Jeints. rather large, orbicular 3—4 
inches in diameter, or obovate, 4-5 inches long by 3 in width ;(a small variety with orbicular yy. ww 
joinsts only 2 inches in diameter occurs on sandstone rock in southern Missouri.) The color of 
the plant is dark or fresh-green. Leaves 2}-4 lines long, diameter about one-fourth of the 
length ; pulvilli 9~12 lines apart with short whitish or grayish wool, and bright red-brown 
bristles conspicuous even in the youngest joints. Spines rarely none, generally few in var. 
microsperma, sometimes disappearing entirely in fertile soil in wandenty; etc.; mostly only on 
the upper part or the edge of the joint, single or rarely 2-3, 9-12 lines long, rather stout, white 
with a darker tip and sometimes also darker base. Flowers 23-3} inches in diameter, sulphur- 
yellow, mostly wi‘h a red centre. Fruit 13-2 inches long, less than half that in diameter, 
narrowed at base, the seminiferous cavity not extending to the base; umbilicus funnel-shaped, 
but with shallow bottom, much wrinkled and scarred; naked by the disappearance of the 
bristles of the pulvilli, and edible, somewhat acid or sweetish. Seeds 24 lines in diameter, 
6r 
Qaunwr Bee o-- Gare a fo fe x fo 7-24 OV xxl fo 73 
