EN CCCUULULLCC IL C IL ON 
OPUNTIACEAE 901 
Hypanthium elongate: leaves spreading and re 
curved: be erry oe adly obovoid, nearly or quite as 
' wide as long eeds abou mm. in diameter. 13. O. turgida. 
Hypanthium Bn as wide as long: leaves ascend- 
e. erry ellipsoid-obovoid, D eee than 
vide: seeds about 6 min, in diam 
Plants. atta with single or EE pom at the 
are 
Mature. “spines ae year) gray, darker 
nd 
14. O. polycarpa. 
gray the 
Meanie ee a mainly pale-vellow : und rounded 
at the base: seeds 6 mm. in diamet 
Young spines brown: berry narrowed, orien con- 
stricted at the base: seeds 4 mm. in diameter. 
Mature spines (first year) white, becoming gray the 
second year. 
Corolla 6-7 em. wide: spines fon e long: berry 
narrowly E 2.5-3.5 em. long. 16. O. austrina. 
Corolla 8- wide: SU ns 5- a long: 
berry Bod obovoid, 4-5 cn 17 
14. O. polycarpa. 
15. O. nitens. 
. 0O. cumulicola. 
VI. AMMOPHILAE 
Plants tree-like, the stout or stocky trunk divided above 
into few or na div ME branching joints, sometimes 
I like: gray-green, usually copiously 
armed. 18. O. ammophila. 
VII. DILLENIANAE 
Fn. Dodd e to acicular, rigid, spreading. 
olae VERE 4-13 short- subulate spines which s 
don exceed the bristles, the joints thus apparently 
unarmed: corolla campanulate or cupulate 
Areolae bearing 2-6 long spines which: much: exceed the 
bristles the joints thus conspicuously armed (in- 
dividuaily Me. unarmed): corolla rotate, 
n O. ter ra. 
19. O. keyensis. 
Cor olla P "d anum and berry con- 
nd into a long slender base, thus decidedly 
elavate. 
Corola rotate: hypanthium and berry 
tracted into a long slender base. 
Berry M longer than thick, the 
20. O. tenuiflora. 
not con- 
umbilicus 
Hpanthium long-turbinate or obconic-turbi- 
nate, much longer than its greatest 
diameter. 
All ME Me armed with a cluster of 
inteemedisite and inner sepals acute: 
be o more or less constricted at the 
ba seeds large, 5-6 
dE 21. O. Dillenii. 
Intermediate and mnr sepals truncate 
ate: y not constricted 
e base: d eiat 3—4 mm. in 
du 22. O. Lindheimeri. 
po E ‘the: ae armed with 1, 2, or 
23. O. stricta. 
3 
Hypanthium short-t urbinate or obovoid-turbi- 
2 t ightly longer than the greatest 
a 
Outer s E E of a deltoid type; intermedi- 
ate sepals reniform or ee reniform, 7 
rounded and minutely poi 24. O. Bentonii. 
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O. tunoidea. 
ate, 
S long, the umbilicus convex. 26. O. turbinata. 
Spines diea setaceous, weak and pliable, sparse, reflexed 
or recurved. 
fn short, UE to orbicular-obovate, the larger 
1-1.5 long: leaves subu ate, reeurved- 
ae ading. 27. O. cantabrigiensis. 
Joints elongate, elliptic, oval or narrowly obovate, the 
arger ones Dus 9 dm. long: leaves loosely ascending. 28. O. magnifica. 
