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Morphology of Cacti - Subfamily Cactoideae, Tribe – Pachycereeae Buxbaum 1958

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Habit

Large, treelike or shrubby (Anderson 2001).

Stems

Unsegmented, columnar, ribbed; reproductive areas undifferentiated or differentiated into apical or lateral cephalia

Leaves

Absent

Areoles

 

Flower

Borne laterally, subapically, or from the cephalia, small to medium, regular or bilaterally symmetrical, varying in shape, nocturnal or rarely diurnal; pericarpels scaly or rarely naked, areoles spiny or bristly

Fruits

Fleshy, spiny, dehiscent or indehiscent

Seeds

Variable, medium to large, hilum and micropyle conjunct or fused, appendages absent

Glochids

Absent

Spines

 

Roots

Fibrous or tuberous roots

Metabolism

CAM - Crassulacean acid metabolism (Anderson 2001).

Neoteny or paedomorphosis

Absent

Distribution

Mainly in Mexico and the southwestern United States but also in the Caribbean, Central America, and South America to Venezuela

  

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