Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
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Elizabeth McClintock

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)


P. racemosa Nutt.


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. Benson
Horticultural 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.

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bioregional map for PLATANUS%20racemosa being generated
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).

Retrieve Jepson Interchange Index to Plant Names entry for Platanus racemosa
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