Sajo, M. G. [UNESP]Rudall, P. J.2014-05-272014-05-271999-06-01Botanical Journal of the Linnean Society, v. 130, n. 2, p. 171-182, 1999.0024-4074http://hdl.handle.net/11449/65780Ensiform leaf development in monocotyledons follows a broadly similar sequence in a wide range of relatively unrelated taxa, indicating a plastic developmental pattern, possibly associated with stressed environmental conditions, since Xyris species tend to grow in relatively damp but nutrient-poor environments. The bifacial leaf sheath surrounds the apex and the subadjacent primordium. A conical unifacial leaf tip 'Vorlauferspitze' is established at an early stage, followed by extension growth in the region behind it, generating a unifacial ensiform blade. Root and rhizome structure are also described in a systematic context, particularly in comparison with related taxa in Xyridaceae and other commelinoid monocotyledons, although information on these structure is relatively sparse.171-182engCommelinanaeMonocotyledonRhizomeRootXyrisArtigo10.1006/bojl.1999.0240Acesso restrito2-s2.0-00330575972126319926799273