Platanus racemosa

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Ordo: Proteales

Familia: Platanaceae
Genus: Platanus
Species: Platanus racemosa
Name

Platanus racemosa Nutt., N. Amer. Sylv. 1: 47 1842.
Synonyms

Homotypic
Platanus orientalis var. racemosa (Nutt.) Kuntze, Revis. Gen. Pl. 2: 636 1891.

References

Nixon, K.C. & Poole, J.M. 2003. Revision of the Mexican and Guatemalan Species of Platanus (Platanaceae). Lundellia 2003(6): 103–137. DOI: 10.25224/1097-993X-6.1.4 PDF Reference page.
International Plant Names Index. 2019. Platanus racemosa. Published online. Accessed: 27 January 2019.

Vernacular names
العربية: دلب كاليفورني
Deutsch: Kalifornische Platane
Ελληνικά: Πλάτανος της Καλιφόρνιας
English: California Sycamore
español: Aliso
فارسی: چنار خوشه‌ای
עברית: דולב קליפורני
hornjoserbsce: Čećikata platana
polski: Platan kalifornijski
русский: Платан кистистый
Türkçe: Kaliforniya çınarı

Platanus racemosa is a species of plane tree known by several common names, including California sycamore, western sycamore, California plane tree, and in North American Spanish aliso. Platanus racemosa is native to California and Baja California, where it grows in riparian areas, canyons, floodplains, at springs and seeps, and along streams and rivers in several types of habitats.[1][2][3] It has been found as far north as Tehama and Humboldt counties.

Description

This large tree grows to 35 metres (110 ft) in height with a trunk diameter of up to one meter (three feet). A specimen on the campus of Stanford University has a trunk girth (circumference) of 10.5 feet (3.20 m).[4] The trunk generally divides into two or more large trunks splitting into many branches. The bark is an attractive patchwork of white, tawny beige, pinkish gray, and pale brown, with older bark becoming darker and peeling away. Platanus racemosa is the dominant species in the globally and state endangered sycamore-alluvial woodland habitat.

The large palmately lobed leaves may be up to 25 centimetres (9.8 in) centimeters wide and have three or five pointed lobes. New leaves are a bright translucent green and somewhat woolly. The deciduous tree drops copious amounts of dry golden to orangish red leaves in the fall. The inflorescence is made up of a few spherical flower heads each around a centimeter wide. The female flower heads develop into spherical fruit clusters each made up of many hairy, maroon-red-woolly achenes.

The tough and coarse-grained wood is difficult to split and work. It has various uses, including acting as a meat preparation block for butchers. Many small birds feed on its fruit, and several mammals eat its twigs and bark. The pollen and the hairs on leaves and flowers can be allergens for some people.[5] New leaves are susceptible to anthracnose canker, which, when it causes a side bud to become the new leader, can create picturesque angling trunks and branches on older specimens.[5]

Cultivation

It is also widely planted horticulturally as a landscape tree in public landscapes and private gardens. While it requires some water, and can be grown in lawns, once established it is drought tolerant. New appreciation for how it shades sun in summer and lets sun through in winter has led to its use in green architecture and sustainable design. The aesthetics of its bark and its overall form add interest.
Platanus racemosa leaves and achenes
See also

Big Sycamore Canyon - a place in Ventura County, California with a population of California sycamore trees

References

Deardorff, David (1977). "Plant Portraits: California Sycamore (Platanus racemosa)". Garden. 1: 5–7 – via Archive.org.
Santa Monica Mountains National Recreation Area (N.R.A.), General Management Plan (GMP): Environmental Impact Statement. United States: n.p., 1982.
National Park Service Santa Monica Mountains National Recreation Area - Riparian Woodlands. U.S. National Park Service
Stanford Trees, Shrubs, and Vines
Californiagardens.com