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|Family: Platanaceae||View Description||Dichotomous Key|
|Genus: Platanus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Platanus racemosa Nutt.
Stem: 10--35 m, often leaning; base < 1(2+) m wide; outer bark light gray, tan, inner paler. Leaf: stipules 2--3 cm, generally persistent after maturity; petiole 3--8 cm; blade +- 10--25 cm, +- round, glabrous to +- hairy adaxially, tomentose abaxially. Staminate Flower: sepals 0; petals free. Pistillate Flower: sepals free; style red-tipped, stigma maroon, glabrous. Fruit: head 2--3 cm, +- sessile; achene 7--10 mm, top truncate or tapered, basal hairs +- 2/3 fruit, persistent on fruit head; style generally persistent. Chromosomes: 2n=42.
Ecology: Common. Streamsides, canyons, arroyos; Elevation: < 2000 m. Bioregional Distribution: CaRF, c&s SNF, Teh, GV, CW, SW, DMoj (Mojave River, n of Victorville), nw DSon; Distribution Outside California: Baja California. Flowering Time: Feb--Apr Note: Hybridizes with Platanus ×hispanica Muenchh; some plants in eastern PR with leaves similar to Platanus wrightii S. Watson of Arizona, New Mexico, Mexico, but with fruit of Platanus racemosa.
Unabridged Note: Some plants in eastern PR at northwestern edge of DSon (e.g., Snow, Chino, Andreas canyons of SnJt) appear intermediate to Platanus wrightii S. Watson, Arizona sycamore, of Arizona, New Mexico, Mexico [Platanus racemosa var. wrightii (S. Watson) L. Benson]. These plants generally have leaves hairy but not tomentose abaxially but fruit identical to Platanus racemosa (fruit of Platanus wrightii 5--8 mm, top truncate or abruptly tapered, basal hairs generally 2/3 to = fruit length, style generally deciduous). New growth often killed by sycamore anthracnose fungus, causing angular branching; leaves eaten by sycamore lace bug; bark mined by larvae of sycamore borer moth causing it to roughen, crumble. Leaves may be re-attached by pushing hollow petiole bases back over bud.
eFlora Treatment Author: Robert Lee Allen
Jepson Online Interchange
Previous taxon: Platanus ×hispanica
Next taxon: Plumbaginaceae
Citation for this treatment: Robert Lee Allen 2016. Platanus racemosa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=38655, accessed on May 24, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 24, 2016.