Shrubs or trees; stems unsegmented, cylindric, 8-12 ribbed; areoles with spines, glochids absent. Leaves vestigial or absent. Flowers solitary in lateral areoles, funnelform, sessile, nocturnal; floral tube conspicuous. Fruit dehiscent or irregularly splitting from the apex; seeds numerous. Derivation of name: Named after William Harris, a botanist of Jamaica. Worldwide: c. 20 species in tropical South America, Antilles, Bahamas and Florida. one species (H. martinii) is known as an invasive in Australia, Africa and Hawaii. Zimbabwe: 1 taxon. |
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