• 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.


Ellagic Acid Betulinic Acid Secondary Xylem Glandular Hair Cyanogenic Glycoside 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Selected Bibliography

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Copyright information

© Springer-Verlag Berlin Heidelberg 1993

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  • K. Kubitzki

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