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Cactaceae
CACTI
Cactus Family; Cactus

Life   Plantae   Dicotyledoneae

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Epiphyllum phyllanthus, leaf
© Tomas Pickering and Graham Wyatt, 2006 · 8
Epiphyllum phyllanthus, leaf
Opuntia humifusa
© Copyright Bobby Hattaway 2011 · 5
Opuntia humifusa
Opuntia humifusa
© Copyright Bobby Hattaway 2011 · 5
Opuntia humifusa

Opuntia stricta
© Copyright Bobby Hattaway 2011 · 5
Opuntia stricta
Opuntia littoralis var. vaseyi
© Copyright Bobby Hattaway 2011 · 5
Opuntia littoralis var. vaseyi
Opuntia rufida
© Copyright Bobby Hattaway 2011 · 5
Opuntia rufida

Opuntia humifusa
© Copyright Bobby Hattaway 2011 · 5
Opuntia humifusa
Opuntia humifusa
© Copyright Bobby Hattaway 2011 · 5
Opuntia humifusa
Cylindropuntia imbricata
© Copyright Bobby Hattaway 2011 · 5
Cylindropuntia imbricata

Pereskia lychnidiflora
© Copyright Bobby Hattaway 2011 · 5
Pereskia lychnidiflora
Pereskia lychnidiflora
© Copyright Bobby Hattaway 2011 · 5
Pereskia lychnidiflora
Harrisia simpsonii
© Copyright Bobby Hattaway 2011 · 5
Harrisia simpsonii

Harrisia simpsonii
© Copyright Bobby Hattaway 2011 · 5
Harrisia simpsonii
Harrisia simpsonii
© Copyright Bobby Hattaway 2011 · 5
Harrisia simpsonii
03.cactus 1.320.jpg
© Photographer/source
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18.Opuntia humifusa, _leaf_+_flower, _EP26.320.jpg
© Photographer/source
18
Opuntia humifusa, leaf + flower, 320
_EP26
21.Opuntia santa_rita.320.jpg
© Photographer/source
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Opuntia santa rita
27.flower 5.320.jpg
© Photographer/source
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Kinds

Associates · map
FamilyScientific name @ source (records)
Apidae  Ceratina arizonensis @ I_JSA (1)
Botryosphaeriaceae  Diplodia opuntiae @ BPI (1)

Fusicoccum @ BPI (1)
Diaporthaceae  Phomopsis @ BPI (1)
Leptosphaeriaceae  Coniothyrium opuntiae @ BPI (1)
Megachilidae  Lithurgus echinocacti @ I_JSA (1)

Lithurgus @ I_JSA (2)
_  Cephalothecium roseum @ 415115B (1); 415115A (1); 415115D (1); 415115C (1)

Exosporium cactivorum @ BPI (1)

Sphaeronaema @ BPI (1)

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Following modified from University of Hawaii
   
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Cactaceae

The Cactaceae are mostly spiny succulents with photosynthetic stems comprising 30-200 genera and 1,000 to 2,000 species further characterized by the presence of betalains, and p-plastids. The leaves are alternate, generally extremely reduced and ephemeral or absent, or rarely they are well developed and fleshy. The leaves are associated with highly modified axillary buds or shoots called areoles that bear spines. The flowers are mostly bisexual and actinomorphic and commonly have many weakly differentiated perianth segments arising from an epigynous zone. The androecium typically consists of a very large number of stamens arising from the inner face of the epigynous zone. The gynoecium consists of a compound pistil of 3-many carpels, an equal number of stigmas, and an equal number of parietal placentae with numerous ovules in the single locule of the inferior ovary. The fruit is a berry, often with spines or bristles.

Each "thumbnail" image below is linked to a larger photograph.


Pereskia grandifolia , Cactaceae, pereskia. Large shrub from Brazil with clusters of pink or white rose-like flowers, each about one and a half inches in diameter. Although the plant bears a few spines that are characteristic of cacti, it is one of only a few species that also bear large foliage leaves.
Opuntia cochenillifera , prickly pear. Note the numerous perianth segments and stamens and several green stigmas in this typical cactus flow er. The ovary is sunken into the stem at the bottom of the photo. Also visible here are several areoles bearing bristles that would persist as the fruit matures.
Hylocereus undatus, night blooming cereus. This well-known Punahou hedge cactus has many perianth segments and stamens. Note also the several pale yellow stigmas visible in the lower front part of the flower.  The sectional view shows numerous parietal ovules in the single locule of the inferior ovary.
Epiphyllum sp., note the very long epigynous zone (hypanthium).
Echinocereus fasciculatus , strawberry hedgehog, vic. Saguaro Natl. Park, AZ, Mar. 2004.
Echinopsis sp.
Rathburnia alamosensis, sectional view.
Rhipsalis oblonga .  Although smaller than the average cactus flower, the blossoms of Rhipsalis are still fairly typical for the family.
Carnegiea gigantea, giant saguaro. Although larger than the average cactus, this species illustrates well the vegetative features and typical habitat of the cactus family.  Saguaro National Park, AZ
Cactaceae. Barrel cactus, cholla, and other xerophytes are visible in this desert habitat.

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Following modified from The Families of Flowering Plants - L. Watson and M.J. Dallwitz
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Updated: 2019-09-15 22:12:24 gmt
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