46 
Fertile prairies, or sterile places, on the Upper Missouri and Yel- 
lowstone, to the mountains and south to Santa Fe. — Size and shape 
of the joints variable ; fruit-bearing joints compressed, 14-2 inches 
long, 1- 14 wide, and 4-2 thick; others smaller and more tumid. 
Leaves a line long, hardly longer than the large pulvilli, red. Pul- 
villi 4 —6 lines apart, bristles very few, short, whitish, on the old joints 
a little more numerous, coarser, dirty yellow. Lower radiating spines 
2-4 lines long; central spines 6-10 lines long, the other interior 
spines 3-8 lines long, often similar to the smaller lower spines. 
Fruit rather fleshy through the winter, getting dry in spring, nearly 
an inch long, with 20-25 pulvilli, of which only the upper ones bear 
a few short spines. Seeds few, usually only 5 or 6 in each fruit, 3 
lines in diameter, with a wide and thick obtuse corky margin. — Often 
sterile, but abundantly propagated by the fragile joints. 
- 28. O. pracnyartara, E. & B. |. c.: adscendens; articulis ovatis 
orbiculatisve tumidis seepe subglobosis tuberculatis; pulvillis confer- 
tis parce setulosis ; aculeis 3-5 validioribus 1-2 fuscatis patulis vel - 
suberectis, czteris deflexis ; floris parvi ovario subgloboso pulvillos 12 
— 15 vix aculeolatos gerente; stigmatibus 5 
Inscription Rock near Zuni. — The short and tumid joints (10-15 
lines long) resemble the joints of a finger; the pulvilli 2—4 lines 
apart, even in the oldest parts of ‘the plant with very few bristles; 
longer spines 9 — 12 lines long, terete. Ovary less than half an inch 
long. Flower apparently an inch in diameter.— Perhaps too near 
O. fragilis ; but in the absence of good flowers and fruit, it is im- 
possible to say whether it does not belong to even a different section, 
perhaps to the Glomerata, Salm. 
Subgen. 3. Cyninpropuntia, E. in B.C. R.  Articuli cylindracei : 
flores magni vel parvi: bacca plerumque sicca: semina immarginata 
seu vix marginata: embryo circa albumen copiosius subcircularis ; 
cotyledones contrariz seu oblique, subinde parallele. 
§ 1. Clavate : prostrate : articuli breves, clavati, adscendentes, tex- 
tura lignosa laxe reticulata: flores flavi majusculi: bacca sicca,” 
pulvillis numerosis setosissimis stipata, floris rudimentis persisten- 
tibus coronata. 
29. O. cuavata, E. in Wisl. Rep.: articulis breviter clavatis late 
viridibus ; tuberculis ovatis ; foliis subulatis minutis; aculeis albidis 
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