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302 PrOCeedINgS OF THe CALIFOrNIA ACAdeMy OF SCIeNCeS<br />
Series 4, Volume 63, No. 8<br />
Thysanocarpus curvipes Hook. Native winter ephemeral herb; HdwS, LdwS, MdS. DB<br />
6646; DBa 5114, 5140.<br />
Thysanocarpus laciniatus Nutt. var. laciniatus Native winter ephemeral herb; HdwS,<br />
MdS. B 8897; DB 4553, 4582, 4604, 5664.<br />
Cactaceae<br />
Carnegiea gigantea (Engelm.) Britton & Rose Native stem succulent; MdS. Fig. 3.<br />
The iconic columnar cactus of the Sonoran desert, Carnegiea gigantea, attains the northwestern<br />
extent of its distribution in the southern Black Mountains. Jeff Pebworth and erin Butler sighted<br />
and photographed (Fig. 3) a single plant on the east side of the Black Mountains south of Sitgreaves<br />
Pass (at ca. 35° lat., -114.35° long.).<br />
Cylindropuntia acanthocarpa (Engelm. & J.M. Bigelow) F.M. Knuth var. acanthocarpa<br />
Native stem succulent; BBS, CBS, HdwS, LdwS, MdS. DB 5627; Eastwood 18220 (CAS);<br />
Hodgson et al. 9126 (deS), 9183 (deS). Fig. 8.<br />
Some of the collections of this species from the southern Black Mountains have been identified<br />
as var. coloradensis (L.d. Benson) Pinkava. For those noted above, the number of spines per<br />
areole varies between 12 and 22, which conforms to var. acanthocarpa (Benson 1982). The number<br />
of “abaxial spines deflexed” varies from five to 11, which also suggests the nominate variety<br />
(Pinkava 2003). eastwood’s collection was determined by M. Baker as var. acanthocarpa in 2015.<br />
Thus, we treat these collections as more readily identifiable with var. acanthocarpa.<br />
Cylindropuntia bigelovii (Engelm.) F.M. Knuth var. bigelovii Native stem succulent; CBS,<br />
HdwS, MdS. DB 5988, 6438a; Hovezak & Hevly s.n (MNA). Fig. 8.<br />
Cylindropuntia echinocarpa (Engelm. & J.M. Bigelow) F.M. Knuth Native stem succulent;<br />
CBS, MdS. DB 6438, 6467.<br />
Cylindropuntia leptocaulis (DC.) F.M. Knuth Native stem succulent; CBS. DB 5976.<br />
Cylindropuntia ramosissima (Engelm.) F.M. Knuth Native stem succulent; CBS. DBP<br />
5970.<br />
Echinocereus coccineus Engelm. Native stem succulent; MdS, PJw. DBH 5687; DBP 5938.<br />
Fig. 8.<br />
Echinocereus engelmannii (Parry ex Engelm.) Lem. Native stem succulent; MdS, PJw.<br />
B 9355; Eastwood 18215 (CAS); Hovezak s.n. (MNA).<br />
Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter Native stem succulent; MdS. DB<br />
5908.<br />
Ferocactus cylindraceus (Engelm.) Orcutt Native stem succulent; CBS, MdS. DB 6474.<br />
Fig. 8.<br />
A collection (Hodgson 15527 at deS) cultivated at the desert Botanical garden (Phoenix, Arizona)<br />
from material collected by P. Quirk in the southern Black Mountains was identified as Ferocactus<br />
wislizeni (engelm.) Britton & rose. The plant has perianth segments (all similar) that conform<br />
to F. wislizeni, but the color and architecture of the spines are ambiguous with respect to distinguishing<br />
that species from F. cylindraceus. Because F. wilsizeni, in general a more southerly<br />
occurring species, is not otherwise known from Mohave County, we feel further studies and/or collections<br />
are needed to document the presence of F. wislizeni in the Black Mountains.<br />
Mammillaria grahamii Engelm. (M. microcarpa engelm. subsp. grahamii (engelm.) Mottram<br />
Native stem succulent; MdS. DB 6644, 6656.5. Fig. 8.<br />
Mammillaria tetrancistra Engelm. Native stem succulent; HdwS, MdS. DB 5648.5.<br />
Opuntia basilaris Engelm. & J.M. Bigelow var. basilaris Native stem succulent; BBS,<br />
CBS, HdwS, MdS, PJw. B 9353; Hovezak & Hevly s.n. (MNA). Fig. 8.
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