Comparative androecium morphogenesis ofSicyos angulatus andSechium edule (Cucurbitaceae)

Imaichi, Ryoko; Okamoto, Kyoko

doi:10.1007/bf02489428

Cited by 2 publications

(1 citation statement)

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“…Filaments of all stamens are united at the base in some Cucurbitaceae (e.g. Echinocystis ; Leins & Galle, 1971; Sechium , Sicyos ; Imaichi & Okamoto, 1992) and in Begoniaceae. In the extreme case, in Cucurbitaceae, the stamens are completely united and the united anthers open with a ring‐like dehiscence line; a feature that may have evolved two times independently within the family ( Cyclanthera , Cyclantheropsis ; Jeffrey, 1961).…”

Section: Discussionmentioning

confidence: 99%

Comparative floral structure and systematics in Cucurbitales (Corynocarpaceae, Coriariaceae, Tetramelaceae, Datiscaceae, Begoniaceae, Cucurbitaceae, Anisophylleaceae)

Matthews

Endress

2004

Botanical Journal of the Linnean Society

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Floral structure, including morphology, anatomy and histology, was comparatively studied in representatives of all seven families of Cucurbitales as currently circumscribed by other authors based on molecular analyses and including Corynocarpaceae, Coriariaceae, Tetramelaceae, Datiscaceae, Begoniaceae, Cucurbitaceae and Anisophylleaceae. Three superfamilial clades are supported by floral structure: Tetramelaceae/Datiscaceae, Tetramelaceae/Datiscaceae/Begoniaceae and Corynocarpaceae/Coriariaceae. Anisophylleaceae appear most isolated in Cucurbitales, and show more similarities with Oxalidales, especially Cunoniaceae, although some features of interest are shared with other Cucurbitales and not Oxalidales. Tetramelaceae and Datiscaceae share dioecy, completely isomerous (but not regularly pentamerous) flowers (not in male Datiscaceae), only small sepals, lacking petals (not in male Octomeles ). Tetramelaceae, Datiscaceae and Begoniaceae share the presence of numerous small ovules and seeds with a largecelled surface, 2-cell-layered integuments, and a collar around the funicle by an extension of the outer integument. Corynocarpaceae and Coriariaceae share thick petals, unifacial stigmas, superior ovaries with a single, median, pendant syntropous ovule per carpel, and annular outer integuments with vasculature at the base. The four classical core families of Cucurbitales: Tetramelaceae, Datiscaceae, Begoniaceae and Cucurbitaceae (relationship unresolved, not retrieved as a clade as yet in molecular studies) share in various combinations androdioecy, basifixed and extrorse or latrorse anthers, trimerous gynoecia, bifurcate free carpel parts, an extended roof over the ovary formed by the ventral parts of the carpels, and parietal placentae. Trends of interest at the order level are unisexual flowers, thick, pointed petals (if present) that do not conform to the model in other rosids or basal core eudicots, a 2-celllayered inner integument, which is delayed in development, and lacking or scant tanniferous tissues in flowers.

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Section: Discussionmentioning

confidence: 99%