Journal
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
Volume 170, Issue 1, Pages 93-111Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1095-8339.2012.01267.x
Keywords
anatomy; monocots; petals; sepals; staminode
Categories
Funding
- Royal Society
- Russian Foundation for Basic Research [12-04-01070]
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Floral morphology, anatomy and development are examined in Xyris grandis (Xyridaceae: Poales), with an emphasis on petal and sepal organogenesis and vasculature. Xyris is one of relatively few monocots in which the perianth is differentiated into two distinct whorls (here termed a double perianth). Xyris also possesses highly unusual perianth vasculature, with each petal being supplied by three veins and each sepal by a single vein, compared with the opposite condition in most other angiosperms with a double perianth. However, perianth development in X.grandis shows a pattern that is typical for monocots, with petals not markedly delayed in development. Xyris grandis is also remarkable for its petal aestivation, with each petal surrounding a stamen and two branches of adjacent staminodes, a type that is not reported for other Xyridaceae and may contribute to secondary pollen presentation. The results are discussed in the context of the diversity of a double perianth in monocots, compared with eudicots. Based on current data, our preferred hypothesis is that meristic differences are at least partly responsible for the apparently widespread occurrence of three-traced petals in monocots. (c) 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, 170, 93111.
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