Members of the cactus kin ( Cactaceae ) bear flowers that are noted for the many stamens in their centers . While the thorny , thorn - protected industrial plant may await double-dyed and uninviting most of the year , rain , heat or day - duration can trigger the yield of flowers . There are between 1,000 an 2,000 unlike species of cacti , which cast from modest ground cover - like lump to upright , Sir Herbert Beerbohm Tree - like specimen .
Prickly Pear
Prickly pears are so named because their fruits are edible but must be carefully pluck from the prickly padded " leaves " from where they mature . Belonging to the botanic genus Opuntia , these cacti bear showy flush that are often yellow , although some species produce white , pink , orangish or reddened flowers .
Saguaro
Naturally found only in the Sonoran Desert , the saguaro ( Carnegiea gigantea ) blooms in belated spring to other summer . Its lily-white blossom exposed at night , attracting nectar - quest and pollinating doves . The flower then closes by noon the following day . Not all bloom opened at once , but rather a few each night over several days . Pollinated bloom become sarcoid fruits , each adulterate with upwards of 4,000 semen , according to Desert USA .
Night Blooming Cereus
Plants that belong to the botanical genus Cereus , Hylocereus or Peniocereus , all of which are commonly call " night blooming cereus " or " queen of the dark , " feature article long stanch that ramble over rocks or tree limb . lily-white blossoms open in total darkness and are closed by dawn the next morning . Plants in the genus Epiphyllum face similar but their heyday are not qualify to opening at dark .
Rose Pereskia
The blossoms of the succulent cactus shrub have sex as rose pereskia look like rose or camellias . Pink prime go on on species Pereskia grandiflora , while staring orangish petals recrudesce on the Pereskia bleo species .
Echinopsis
Echinopsis common is found throughout the desiccate part of South America . There is immense diversity among the approximately 100 different species , but their flower all apportion a cornet - like shape and decorative flare .
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