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It is contained in a seed-vessel formed from the ovary in the plants called angiospermous; while in gymnospermous plants, such as Coniferae and Cycadaceae, it is naked, or, in other words, has no true pericarp.

The plant yielding the alkaloid, Lycopodium complanatum, belongs to the group of angiospermous cryptogams.

And it is not till Cainozoic times that we have the endogenous grasses and palms and angiospermous exogens.

Its predominant life features are the culmination and the beginning of the decline of reptiles, amphibians, cephalopod mollusks, and cycads, and the advent of marsupial mammals, birds, teleost fishes, and angiospermous plants.

Darwin was immensely impressed with the outburst on the world of a fully fledged angiospermous vegetation.