[aroid-l] forma, variety and subspecies

From: "Bulbous Aroids" bulbous.aroids at wanadoo.nl> on 2002.12.08 at 15:23:12(9684) Dear all I have been reading the book "The Genus Arum" from Peter Boyce and he writes about different Arum species but some species has subspecies and other one's have variety's. Can somebody explain to me the difference between a subspecies and variety and there is also a mentioning of a forma.

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