Arrangement of reproductive units in Centrolepis (Poales: Centrolepidaceae): cincinnus or spikelet?статья

Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.

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[1] Arrangement of reproductive units in centrolepis (poales: Centrolepidaceae): cincinnus or spikelet? / D. D. Sokoloff, M. V. Remizowa, H. P. Linder et al. // Diversity, phylogeny, and evolution in the Monocotyledons. — Aarhus Univ. Press Aarhus, 2010. — P. 425–436. Reproductive units of Centrolepis consist of a single stamen and 1‑30 carpels surrounded by 0‑3 tepal-like phyllomes. In most species of Centrolepis, the main inflorescence axis bears two primary bracts, each typically subtending a group of reproductive units arranged in a zigzag pattern. Two contrasting interpretations of this zigzag arrangement have been proposed, either (1) a cincinnus, or (2) a dorsiventral spikelet. Choosing between these two interpretations is problematic because bracts subtending the reproductive units were previously not observed in any species. We use evidence from a recently described species from tropical Australia, C. racemosa, which possesses highly unusual inflorescence morphology with solitary reproductive units in the axils of numerous green bracts. Comparison between C. racemosa and another northern Australian species, C. exserta, suggests that the zigzag arrangement of reproductive units that is typical of most Centrolepis species should be interpreted as a dorsiventral spikelet. Furthermore, additional investigation revealed rare inflorescences of C. exserta with subtending bracts developed at the positions predicted by the spikelet hypothesis.

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