• K. Kubitzki
Part of the The Families and Genera of Vascular Plants book series (FAMILIES GENERA, volume 2)


Anemophilous trees, often with mottled bark falling off in large flakes; non-glandular hairs either long, multicellular-uniseriate, or shorter, with whorls of uniseriate branches, matted, sometimes appearing almost stellate; glandular hairs with unicellular, globose head; leaves deciduous, petiolate, alternate, palmately veined and lobed (pinnately veined and entire in P. kerrii); the petiole usually mitriform at the base and enclosing the axillary bud (bud free in P. kerrii); stipules paired, sometimes united. Plants monoecious, anemophilous; inflorescences long-pedunculate, pendent, of 1 (or more) globular heads of numerous unisexual flowers; each globe subtended by a circular bract, smaller bracts interspersed among the flowers; flowers small, inconspicuous, hypogynous, regular, unisexual; perianth commonly 3–4(−7)-merous, the sepals free or basally connate, not vasculated; petals vestigial; stamens in staminate flowers as many as and opposite the sepals; filaments short; anthers dithecous, tetrasporangiate; the connective enlarged at the apex into a peltate appendage; staminate flowers sometimes with vestigial carpels; pistillate flowers with 3–4 staminodia and 3–8 distinct carpels in 2–3 whorls; carpels imperfectly sealed distally; styles linear, stigmatic on the inner side; ovule 1(−2), orthotropous, bitegmic, crassinucellar, pendent. Fruits crowded into a globose head, each nutlet surrounded by long hairs; seeds with a thin testa; endosperm scanty, oily and proteinaceous; embryo slender, straight, dicotyledonous.


Europe Cretaceous Turkey Flavonoid Glycoside 

Selected Bibliography

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© Springer-Verlag Berlin Heidelberg 1993

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  • K. Kubitzki

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