Jepson Interchange (more information)
Print edition is available from the University of California Press
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This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants. |
| Jepson Flora Project: Jepson Interchange |
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TREATMENT FROM THE JEPSON MANUAL |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press |
| The second edition of The Jepson Manual (2012) is available from the University of California Press | |
| See also the Jepson eFlora, which parallels the Second Edition |
Tree, generally monoecious, wind-pollinated
Stem: branches irregular below, spreading to erect above; bark irregularly colored, scale-like, peeling; twigs dense-hairy
Leaves simple, alternate, deciduous, generally palmately 3- or 5-lobed, -veined; stipules generally leaf-like, free or fused around stem, shed before leaves; petiole at base dilated, hollow, ± covering bud; blade dense-hairy, glabrous in age, hairs stellate
Inflorescence: heads 1–6, ± 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
Flowers unisexual; calyx cup-shaped, scale-like, entire or 3–6(8)-lobed or sepals ± free
Staminate flower: petals 3–6, fleshy or scale-like, minute or vestigial; stamens 3–6(8), alternate petals, anthers subsessile, axis above anther expanded, disk-like; pistils vestigial
Pistillate flower: petals 3–6, minute, or generally 0; staminodes often 3–4; pistils (3)5–9, ovaries superior, 1-chambered, generally 1-ovuled, style 1
Fruit: spheric head of small, hairy, basally bristly achenes; style persistent
Genera in family: 1 genus, ± 8 species: n temp; some ornamental, especially P. X acerifolia (Aiton) Willd., London plane tree; some cultivated for wood, veneer
Reference: [Ernst 1963 J Arnold Arbor 44: 206–210]
Etymology: (Greek: probably broad, from leaves)
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Stem 10–35 m; base < 1 m wide; bark smooth, pale
Leaf: stipules 2–3 cm; petiole 3–8 cm; blade ± 10–25 cm, ± round, lobes 3 or 5, acute to acuminate, entire
Inflorescence: heads 3–5, ± 1 cm
Fruit: heads 2–3 cm, sessile or not
Chromosomes: 2n=42
Ecology: Common. Streamsides, canyons
Elevation: < 2000 m.
Bioregional distribution: c&s Sierra Nevada Foothills, Tehachapi Mountain Area, Great Central Valley, Central Western California, Southwestern California, w Sonoran Desert
Distribution outside California: Baja California
Flowering time: Feb–Apr
Plants in PR, with some pistillate inflorescences with peduncles 5–15 mm have been called var. wrightii (S. Watson) L.D. BensonHorticultural information: IRR, SUN: 1, 2, 3, 7, 8, 9, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24; susceptible to sycamore anthracnose.
| YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps). |
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