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Morphology of Cacti - Subfamily Cactoideae, Tribe – Cacteae

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Habit

Solitary or caespitose (Anderson 2001).

Stems

Unsegmented, mostly globose, but some short columnar, ribbed, ribbed-tuberculate, or tuberculate

Leaves

Usually oval, bandlike, grooved, or dimorphic

Areoles

Dimorphic areoles

Flower

Subapical, small to medium, diurnal, regular to rarely bilaterally symmetrical; pericarpels scaly to naked

Fruits

Berrylike, fleshy, indehiscent to dehiscent or simply disintegrating

Seeds

Small to large, variable in shape and in testa relief; hilum and micropyle disjunct or rarely conjunct; appendages absent with the exception of rare strophioles

Glochids

Absent

Spines

 

Roots

Fibrous or tuberous roots

Metabolism

CAM - Crassulacean acid metabolism (Anderson 2001).

Neoteny or paedomorphosis

Present (Anderson 1986).

Distribution

United States, Mexico, Canada, the Caribbean, Venezuela, and Colombia

  

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