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Term Definition
Cotyledons absent (= embryo macropodial) A massive embryo that shows no obvious cotyledons. Cotyledons absent. Photo by S. A. Mori
Embryo A young seed plant found within the seed, a dicotyledon embryo consists of the hypocotyle, cotyledons (usually two), and the epicotyl. Examples of embryos without cotyledons in the Lecythis ollaria clade. Photos by S. A. Mori.
Embryo air chamber Referring to an embryo with a chamber inside of the seed caused by bowed cotyledons. Bowed cotyledons and seed air chamber of Allantoma integrifolia. Photo S. A. Mori.
Embryo macropodial (= cotyledons absent) Massive embryo that shows no obvious cotyledons. Cotyledons absent is the preferred term. Cotyledons absent. Photo by S. A. Mori