900 OPUNTIACEAE 
I. CURASSAVICAE 
Larger joints broad, obovate, oval, suborbicular, or sub- 
globose: spines setaceous -acicular, SP ionally long 
and slender: berry urceolate, tubercul 
Larger joints elliptic, linear- elliptic, spatulate, or sub- 
cylindric: spines acicular- u erry of a turbi- 
Has obovoid or clavate ty 
des ios dv subcylindric, tonis slightly m 
repand-tuberculate: berry narrowly turbinate 
clavate-turbinate 
Joints decidedly flattened although often quite turgid, 
n repand: ber obovoid to obconic-turbinate or 
clavate. 
Corolla Jenn: mad a deep-green: spines 
ark-g wly obovoid obconic- 
tur binate, e ‘than vice as long as 
Corolla bright-yellov : joints pale-green : spines 
mick gray: berry usate, over twice as long as 
thick. 
e 
III. Tux AE 
IV. OCHROCENTRAE 
Plants erect and diffusely branched, with rather narrow 
light-green joints: oe stout, DEBEO vellow in the first 
year, e in the seco 
TORTISPINAE 
Plants prostrate, the stem and branches often forming 
depressed mats or colonies of join 
Pla n not armed with spines. 
Joints Tg dd mueh longer than wide, thick or 
turgid: berry 4—6 c lo 
Joints | broad, itide jl noon than wide, usually thin- 
Joints dee T E berry clavate-obovoid or nar- 
rowly o 
Joints pea ceo berry obovoid: 
Plants a med, the spines mostly solitary in an 
are ola 
wid 
Joints dull, deco: green pe Dluishereens inner 
sepals not reniform: corolla 6 cm. wide or 
more: mature spines gray in the first and 
second years: inner petals longer than 
ide. 
Joints deep-green : berry clavate-obovoid or 
narrowly obconic: spines dark- E aran 
Joints raS oo erry oid: spines 
pale-gray, ut. 
io shining: SHOE sepals reniform: corolla 
m. wide or less: mature spines ivory-white 
“th first year, gray in the second: inner 
BI nearly or quite as wi E as long. 
ids joints narrow, ied SES 
ermediate sepals ovate; inus sepals merely 
ute: p RLM Minds Dod de seed usually less 
than 
Intermediate sepals io eme ep 
abruptly acuminate: berry clavate, constricted 
at t the base: seed 5 
eter 
Plants erect, oa diffusely branched, sometimes forming 
thicke ts. 
Plants not armed with spines. 
2. O 
. 0 
O 
. 0 
6. 0 
T. O 
8. O 
9. O. 
0. O 
9. O 
. 0 
11. O. 
8. O 
12. 0: 
abjecta. 
. Tracyi. 
. Drummondii. 
. impedita. 
. pisciformis. 
. eburnispina. 
. ochrocentra. 
. macrarthra. 
Opuntia. 
. Pollardi. 
. Opuntia. 
. Pollardi. 
atrocapensis. 
.macrarthra. 
lata. 
