Cephalocereus


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Cephalocereus

 

a genus of plants in the Cactaceae family. There is one species—the old-man cactus (C. senilis). The columnar and only slightly branched stem reaches 15 m in height and 30 cm in diameter. Lignification is insignificant. There are 20 to 30 ribs, bearing bundles of small spines and long white straight or curly hairs. Plants entering into the blooming phase form a special organ—the cephalium—a zone on the stem where, instead of ribs, low areoles with bundles of long bristles and hairs are formed. The bell mouth-shaped flowers developing on the cephalium are pinkish and unpleasant in odor; they open at night. The fruits are violet-red berries. The old-man cactus is native to Mexico. The plant grows well on steep limestone slopes in dry, hot valleys. The cactus is cultivated in botanical gardens and as an ornamental house-plant.

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He subdivided his Cereoideae (= Cactoideae) into three tribes: Echinocacteae, containing columnar and globular genera, such as Cephalocereus, Cereus, Echinocactus, Echinocereus, Echinopsis, Epiphyllum, Leuchtenbergia, Melocactus, Phyllocactus, and Pilocereus; Mammillarieae, currently Cacteae, with the genera Mammillaria and Pelecyphora; and Rhipsalideae, which grouped Hariota, Pfeiffera, and Rhipsalis.
Also, Terrazas and Loza-Cornejo found that the presence of crystals in epidermal and hypodermal cells supports the clade conformed by species of Cephalocereus, Neobuxbaumia, and Pachycereus fulviceps (F.
In both analyses, Neobuxhaumia and Cephalocereus are sister taxa, based on the occurrence of prismatic crystal in the epidermis (36) and the lack of sclereids in the secondary phloem (52).
candelaris 1996; Mauseth & Plemons- Rodriguez, 1998 Calymmanthiwn substerile Mauseth & Plemons-Rodriguez, 1998 Carnegiea gigantea Gibson, 1973; Hemenway, 1934; Terrazas & Loza-Cornejo, 2002 Cephalocereus apicicephalium, Gibson, 1973; Gibson & Horak, C.
Caricaceae) Nassau/New Providence January 12, 1932 Carica papaya Nassau/New Providence April 12, 1933 (b) Cephalocereus bahamensis North side of Crooked February Britton & Rose (Cactaceae) Island 20, 1933 [= Pilosocereus polygonus (Lam.
recurvata is found on Beaucarnea gracilis, and even on some columnar cacti as Cephalocereus columna-trajani and Neobuxbaumia tetetzp (Garcia-Suarez et al.
Unlike thornforests, arborescent cacti (Pachycereus pecten-aboriginum, Stenocereus chrysocarpus, Cephalocereus purpusii, and some tall-arborescent Opuntia), which mainly prosper in xeric habitats, are shorter than tree-tops and stay hidden under dense leafage during the rainy season.
It has been observed that columnar cacti such as Cephalocereus columna-trajani, Escontria chiotilla, Neobuxbaumia tetetzo, Pachycereus fulviceps, P.
In the long-lived columnar cacti, plants reproduce for the first time when individuals are 33 years old in Carnegiea gigantea (Steenbergh & Lowe, 1977), 70 years old in Cephalocereus columna-trajani (Zavala-Hurtado & Diaz-Solis, 1995), and more than 90 years old in Neobuxbaumia macrocephala (Esparza-Olguin et al.
In contrast, species in the different genera of columnar cacti may reproduce in autumn/winter (Cereus, Myrtillocactus, Pachycereus, Pilosocereus, Selenicereus, Stenocereus) or spring/summer (Carnegiea, Cephalocereus, Escontria, Hylocereus, Lophocereus, Neobuxbaumia, Pachycereus, Pilosocereus, Polaskia, Stenocereus, Subpilocereus), and their reproductive periods last for 2 to 4 months (Steenbergh & Lowe, 1977; Weiss et al.
uncertainty in the proposed aspect) Species Nurse plant Life-cycle stage Columnar cacti Carnegiea Ambrosia deltoidea S-J-A gigantea * Cercidium microphylum Encelia farinosa Laura tridentata Olneya tesota Prosopis juliflora Cephalocereus Caesalpinia S-J hoppenstedtii * melanadenia Escontria Acacia S-J-A chiotilla * cochliacantha Fouquieria formosa Mimosa luisana M.
wislizeni Columnar cacti Carnegiea gigantea 3 1 3 Cephalocereus columnatrajani Escontria chiotilla Lophocereus schottii Neobuxbaumia macro- 1 3 cephala N.