Scientific name:
Cylindropuntia x kelvinensis
Common name:
Kelvin cholla
Range:
Central south Arizona, around Tucson and south of Phoenix
Form:
Large clumps branching from a woody trunk
Habitat:
Scrubland, grasslands, rocky slopes
Flowers:
Pinkish purple, blooming April to June
Distribution map for cylindropuntia-x kelvinensis
Cylindropuntia x kelvinensis is a natural hybrid of two other south central Arizona species, cylindropuntia fulgida (jumping cholla) and cylindropuntia spinosior (cane cholla), and resembles a more lightly-spined version of the former. The general shape of the shrub and its green or purplish branches is similar to the jumping cholla, and the plant also has chains of spineless green fruit that persist for several years - but only of two to five fruits, far fewer than the parent species.
Spines on the stems may be absent, but if present number up to 13, are no more than an inch long, usually shorter, and generally do not overlap with adjacent clusters. Branches are typically just over an inch in diameter, intermediate between the two parent species.
Flowers are pinkish-purple. Anthers are yellow (creamy-white for cylindropuntia fulgida), while filaments are deep pink, and the stigma greenish-white.
Spines on the stems may be absent, but if present number up to 13, are no more than an inch long, usually shorter, and generally do not overlap with adjacent clusters. Branches are typically just over an inch in diameter, intermediate between the two parent species.
Flowers are pinkish-purple. Anthers are yellow (creamy-white for cylindropuntia fulgida), while filaments are deep pink, and the stigma greenish-white.
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