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PLATANACEAE PLANE-TREE or SYCAMORE FAMILY

Robert Lee Allen

Tree, generally monoecious, wind-pollinated; hairs many-branched. Stem: bark peeling in scaly plates, leaving ± smooth areas of various colors, in age dark, thick, fissured; twig hairs dense. Leaf: simple, alternate, deciduous; lobes, veins generally 3,5(7), palmate; stipules generally leaf-like, free or fused around stem, shed by leaf maturity or not; petiole at base dilated, hollow, ± covering bud; blade hairs dense, ± 0 in age. Inflorescence: heads 1–7, ± evenly spaced on axis, spheric, many-flowered, sessile or on pendent peduncles, generally unisexual; staminate breaking apart in age; pistillate persistent; bracts subtending heads, flowers. Flower: unisexual; calyx cup-shaped, sepals (0)3–6(8), free or united basally. Staminate flower: petals 3–6, minute or vestigial, fleshy or scale-like; stamens 3–6(8), alternate petals, anthers subsessile, axis above anther expanded, disk-like, ± peltate; carpels vestigial or 0. Pistillate flower: petals 3–6, minute, or generally 0; staminodes often 3–4; carpels (3)5–9, free, ovary of each superior, 1-chambered, generally 1-ovuled, with 1 ± linear style. Fruit: achenes in spheric head, small, each with hairs from base, shorter hairs up the side; style persistent, beak-like, or deciduous.
1 genus, ± 8 species: northern temperate; some cultivated for ornamental, shade; wood generally of limited commercial value. [Feng et al. 2005 Syst Bot 30:786–799] —Scientific Editor: Thomas J. Rosatti.
Unabridged genera in family: 1 genus, ± 8 species: northern temperate; some cultivated for ornamental, shade; wood generally of limited commercial value, although long ago used for buttons, the trees then called buttonwood.
Unabridged note: Leaves and twigs with many-branched hairs, each comprising a single multicellular central axis with unicellular lateral, generally whorled rays.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 23 2014
Citation for this treatment: [Author of taxon treatment] 2013. Platanaceae, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=221, accessed on Sep 23 2014

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