General Information |
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Distribution | A taxonomically complex genus of 80-100 species from Indo-Malesia to China, widely cultivated as ornamentals.
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Habit
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Large herbs; stems above or below ground, decumbent to erect, thick.
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Leaves
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Leaves petiolate; blade usually sagittate or hastate, rarely peltate.
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Flowers
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Inflorescences axillary, these 2 to several together, much shorter than leaves, subtended by bracts at base; spathe markedly constricted in proximal portion to form a tube, opening only at anthesis, then with at least the base re-closing tightly. Flowers unisexual, naked; spadix shorter than spathe, pistillate portion somewhat shorter than fertile staminate portion, with a sterile
staminate portion (appendix) in between, and a large terminal sterile appendage; staminate flowers with 3‒8 connate stamens forming a truncate synandria; pistillate flowers
unilocular or sometimes 3‒4-locular at apex, stigma weakly 3-lobed, ovules few, basal.
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Fruit
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Fruit a berry, 1-seeded to several seeded.
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Seeds
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Seeds white to brownish, subglobose.
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Notes
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Widely cultivated as ornamentals for their attractively patterned leaves. The name is derived from Colocasia, an arum, and, apparently, the Greek alocho, bedfellow or spouse, as a prefix, alluding to the close relationship between Colocasia and Alocasia.
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