North American Species of Cactus - LightNovelsOnl.com
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Radials 7 or 8: tubercles 40 to 50 mm. long.
longimamma (36).
Radials 10 to 12: tubercles 12 to 15 mm. long.
gummiferus (8).
++++ Radials numerous (16 to 60), capillary or bristle-like.
Radials 15 to 30, slender but rigid (bristly).
acanthophlegmus(2), densispinus (4), bispinus (14), rhodanthus (26), sulphureospinus (27), palmeri (29), pringlei (32).
Radials 30 to 60 or more, mostly capillary.
tetrancistrus* (22), capillaris (28), texa.n.u.s* (31), spaerotrichus (33).
***** Central spines more than one and but one of them hooked.
Radials 10 to 15.
goodrichii* (16), setispinus (24).
Radials 15 to 30.
pondii (17), grahami* (19), bocasa.n.u.s (20).
Radials 30 to 60.
tetrancistrus (22).
****** Central spines more than one, and more then one of them hooked.
Radials 8 to 12.
wrightii* (15).
Radials 30 to 60.
tetrancistrus (22).
II. Tubercles with a more or less prominent groove.
* Central spines none.
+ Radials whitish and rigid, oppressed (pectinate) and interwoven with adjacent cl.u.s.ters.
Depressed-globose and simple.
compactus (44).
Globose and simple.
radians* (45), corniferus (47).
Cespitose.
pectenoides (46), sulcatus* (49).
++ Radials more slender and spreading.
Radials 10 to 17.
missouriensis* (37), similis* (38), macromeris* (64).
Radials 30 to 50, capillary.
dasyacanthus* (51).
** Central spine solitary, not hooked.
+ Central spine porrect.
Radials 6 to 17.
missouriensis* (37), robustior* (39), scheerii* (40).
Radials 30 to 50, white and capillary.
dasyacanthus* (51).
++ Central spine curved downwards.
Radials 8 to 12.
sulcatus* (49).
Radials 12 to 26.
robustispinus (41), recurvatus (42), corniferus (47), scolymoides* (48).
+++ Central spine erect: Mexican.
Radials 7 or 8: central 50 mm. long.
salm-dyckia.n.u.s (43).
Radials 10 or 11: central 25 to 35 mm. long.
maculatus (52).
Radials 13 to 16.
compactus (44).
*** Central spine solitary and hooked.
brunneus (53).
**** Central spines more than one and none of them hooked.
Centrals 2: radials 6 to 20.
scheerii* (40), robustispinus (41), recurvatus (42), scolymoides* (48).
Centrals 3: radials 6 to 40.
scheerii* (40), scolymoides* (48), echinus* (50), conoideus (54), neo-mexica.n.u.s* (59), arizonicus* (60).
Centrals 4 or 5: radials 6 to 40.
scheerii* (40), scolymoides* (48), echinus* (50), conoideus (54), tuberculosus* (56), viviparus* (57), radiosus* (58), neo-mexica.n.u.s* (59). arizonicus* (60), macromeris* (64).
