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A cactus (pl.: cacti, cactuses, or less commonly, cactus) [3] is a member of the plant family Cactaceae (/ k æ k ˈ t eɪ s i. iː,-ˌ aɪ /), [a] a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. [4]
Flowers grow 8.6–12.4 cm (3.4–4.9 in) long, and are open for less than 24 hours. Since they form only at the top of the plant and the tips of branches, saguaros growing numerous branches is reproductively advantageous. Flowers open sequentially, with plants averaging four flowers open per day over a bloom period lasting a month. [7]
The name Cactus became so confused that the 1905 Vienna botanical congress rejected Cactus as a genus name, [4] and conserved Mammillaria. [ 1 ] Mammillaria is a large and diverse genus with many species often exhibiting variations due to the nature of terrain, weather, soil and other ecological factors.
The flower buds are blunt shaped. [5] The flowers are fragrant highly variable in color, the colored inner tepals (casually called petals) coming in white, pink, magenta, yellow, or yellow-green. [7] [3] The size of the flowers of Pediocactus simpsonii ranges from 1.2–3 centimeters across and 1–2.5 centimeters in depth. [3]
Mammillaria elongata, the gold lace cactus or ladyfinger cactus, is a species of flowering plant in the family Cactaceae, native to central Mexico. Growing to 15 cm (6 in) tall by 30 cm (12 in) wide, it consists of densely packed clusters of elongated oval stems, covered in harmless (although very sharp) yellow or brown spines, and in spring producing white or yellow flowers.
Xerophytic plants exhibit a diversity of specialized adaptations to survive in such water-limiting conditions. They may use water from their own storage, allocate water specifically to sites of new tissue growth, or lose less water to the atmosphere and so channel a greater proportion of water from the soil to photosynthesis and growth.
The typical habitat is hot and very arid, and the plants have adapted to exploit water movement to concentrate their biomass in areas where water is likely to be present. Like Sclerocactus , Ferocactus typically grow in areas where water flows irregularly or depressions where water can accumulate for short periods of time.
All were treated by David Hunt in 2006 as included within O. galapageia, a placement accepted by the IUCN Red List as of 2017, although they had been assessed as separate species in 2000. [1] Plants of the World Online also accepts the placement within O. galapageia , and includes Opuntia echios , in most cases placing the species in an ...