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From Ancient Greekἀγγεῖον(angeîon, “receptacle”) + σπέρμα(spérma, “seed”).
(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “Do we know when the term was coined?”)
1992, Rudolf M Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, pages 3-4:
As with the Lejeuneaceae, this pattern of massive speciation appears to be correlated with the Cretaceous explosion of the angiosperms and the simultaneous creation of a host of new microenvironments, differing in humidity, light intensity, texture, etc.
1997, Valentin A. Krassilov, Angiosperm Origins: Morphological and Ecological Aspects, page 134:
The notion of magnoliaceans as the most primitive living angiosperms, justified or not, does not mean that all their characters, including multilacunar nodal anatomy and the lack of tannins, are primary.
2009, Xin Wang, 3: New Fossils and New Hope for the Origin of Angiosperms, Pierre Pontarotti, Evolutionary Biology: Concept, Modeling, and Application, page 55,
With all these features, it is pretty easy for one to identify an angiosperm. This is a very normal and common practice for neobotanists. However, the situation becomes complicated when you go back to the early history of angiosperms.
Category:angiosperms on Wikimedia Commons.Wikimedia Commons 