Platanaceae

Classification System: APG IV

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

Familia: Platanaceae
Genera: Platanus

Paleogenera: †Macginicarpa – †Macginitiea – †Plataninium

Name

Platanaceae T.Lestib. Botanogr. Élém. 526, 1826.
References

Lestiboudois, T.G. (1826) Botanographie Élémentaire 526.
Manchester, S.R. (1986) Vegetative and reproductive morphology of an extinct plane tree (Platanaceae) from the Eocene of Western North America. Botanical Gazette 147(2): 200–226.
Manchester, S.R. (1994) Fruits and seeds of the Middle Eocene Nut Beds Flora, Clarno Formation, Oregon. Palaeontographica Americana 58: 1–205.
Stevens, P.F. 2001 onwards. Angiosperm Phylogeny Website. Version 14, July 2017 [and more or less continuously updated since]. Online. Reference page.
Tropicos.org 2015. Platanaceae. Missouri Botanical Garden. Published on the internet. Accessed: 2015 Feb. 26.

Vernacular names
Deutsch: Platanen
English: Plane
suomi: Plataanikasvit
magyar: Platánfélék
italiano: Platanacee
русский: Платановые
Türkçe: Çınargiller
中文: 悬铃木科

Platanaceae, the "plane-tree family", is a family of flowering plants belonging to the order Proteales. The family consists of only a single extant genus Platanus, with eight known species.[2] The plants are tall trees, native to temperate and subtropical regions of the Northern Hemisphere. The hybrid London plane is widely planted in cities worldwide.

The plane-tree is referenced in Pliny the Younger's letter to Domitius Apollinaris as part of his description of his Tuscan Villa located somewhere in Tuscany in the first century.
49-million-year-old fossil Macginitiea gracilis from the Klondike Mountain Formation, Washington

Description
Example of P. orientalis

Large, sympodial, deciduous tree, speckled bark that sheds in large irregular sheets, leaving a smooth surface that is mottled and pale, persistent bark at the base of the trunk, indumentum with large glandular hairs, multicellular and uniserrate or short with uniserrate ramification (in candelabrum), in stellate fascicles; glandular hairs with unicellular, globular capitulum, cuticular waxes without crystalloids, with rods and plates
Leaves generally with very variable shapes and nervation, simple, alternate, more or less distichous, isobilateral palmate with three to seven lobes (palmatifid to palmatisect) with whole edges or with glandular teeth (each one with a midvein that broadens towards the glandular apex, where it ends in an open hole), or penninerved and whole (Platanus kerrii), this shape common in young, vernal leaves in other species, vernation folded, with the petiole usually sheathed, enclosing the axillary bud (bud is free in P. kerrii), stipules foliose, large, intrapetiolar, tubular, normally caduceus, in P. kerrii scarious, small, basally fused to the petiole, domatia present, stomata irregularly anomocytic
Stems with aggregated rays in the xylem, with nodes septilacunar, cork cambium present and superficial, buds covered by single scale
Plants monoecious, the flowers of each sex in separate inflorescences
Inflorescences in large hanging peduncles, each one a unisexual, globular capitulum, pedunculate or seated, with numerous flowers, derived from the condensation of a panicle, with a circular bract at the base and bracteoles among the flowers
Flowers small, inconspicuous, hypogynous, regular unisexual, receptacle short, smooth, hypogynous disk absent, perianth reduced, sepals number three to four, rarely eight, free or basally fused, shorter than the petals, triangular. Petals number three to four, rarely eight, truncated-spatulate or vestigial, scarious, frequently absent in the female flowers, male flowers with androecium haplostemonous, isostemonous, oppositisepal, with number three to four, rarely eight, stamens, gynostemium short or vestigial, anthers basifixed, not versatile, dithecous, tetrasporangiate, elongated, connectivum apically widened, peltate, dehiscence along longitudinal valves; pistillidium sometimes present, female flowers with superior gynoecium carpels apocarpous in two or three whorls, imperfectly closed apically, surrounded by large petals, linear stylodious, stigmas internal, decurrent in two ridges, more or less dry, two ovules per carpel but one nearly always aborts, orthotropous, bitegmic, crassinucellated, pendulous, apical to marginal placentation, three or four staminodes 3-4, no nectaries
Fruits in achene, clavate, grouped in a globular capituliform infructescence, each fruit surrounded by long hairs

Fruiting body of P. orientalis (Oriental plane tree).

Fruiting body of American sycamore (P. occidentalis) with some achenes removed

An achene

Cross section of an achene with the seed shown in brown

Seeds small with thin testa with little endosperm, oily and proteinaceous, embryo thin and straight with two linear cotyledons, often uneven
Pollen in subprolate monads, 16-22 μm in length, tricolpate, sometimes sextarugate, tectate-columellate, reticulated surface, the base layer as thick as the tectum
Chromosomal number: 2n = 14, 16, 21, 42; x probably equal to 7 or 8

Ecology

Pollination is anemophilous; flowering begins at the start of spring when the new leaves are sprouting. The heads that sustain the fruit normally shed the year after they have matured, during the autumn. Dispersion of the individual fruiting bodies, with their thistledown, is anemochorous (they are sometimes dispersed by water as a secondary mechanism).

The plants grow in cool situations in temperate climates and are frequently found on the banks of rivers and streams. They are totally absent from dry or excessively cold areas.
Phytochemistry

They contain cyanogenic glycosides derived from tyrosine, flavonoids belonging to the proanthocyanidins group (e.g. prodelphinidin) and flavonols (kaempferol, quercetin, myricetin), in addition to triterpenols (including betulinic acid). They lack ellagic acid, saponins, and sapogenins.
Cultivation
Morphological details of P. occidentalis

The main use for a number of the species is to provide shade in pedestrian areas in temperate regions, particularly the London plane-tree (Platanus x hispanica), which is widely distributed throughout Europe and North America. It is highly resistant, probably due to so-called hybrid vigour, although its use requires caution due to their allergy-producing thistledown. The parent species are also grown for the same effect, but with poorer results as they are less resistant to contamination, among other reasons. The wood is used in cabinetmaking, paneling, and other interior work, and is also prized for its long burn time.
Fossils

A large number of fossils of this family have been recorded from the Lower Cretaceous (98-113 million years ago, Platanocarpus). The examples from that time had very small pollen (8-10 μm) and a developed perianth and they lacked hairs at the base of the nucule. It is thought to have had entomophilous pollination. During the mid Cretaceous, the fossilized forms with platanoid leaves became mixed with pinnate leaves (Sapindopsis) or pedatisect leaves (Debeya, Dewalquea), and these forms lasted until the Eocene. The leaves with typical stipules belonging to the sub-genus Platanus are very common in Palaeocene formations (60 M years ago). It is thought that the only modern genus, Platanus, is a relict that can be considered a living fossil. It must have been polyploid during its evolution judging by the size of its stomata.
Systematic position

The APG II system (2003) allows the option of including it in the family Proteaceae, or treating it as distinct as a segregate family. In as far as APG II accepts the family, it is placed in the order Proteales, in the clade eudicots. This represents a slight change from the APG system of 1998, which did accept this family. The Cronquist system of 1981 recognized the family and placed it in order Hamamelidales, in subclass Hamamelidae [sic] in class Magnoliopsida (dicotyledons). The Dahlgren system and Thorne system (1992) also recognized this family and placed it in the order Hamamelidales in superorder Rosanae in subclass Magnoliidae sensu Dahlgren and Thorne (dicotyledons). The Engler system, in its 1964 update, also recognized the family and placed it in the order Rosales in subclass Archichlamydeae of class Dicotyledoneae. The Wettstein system, last revised in 1935, also recognized the family and placed it in the order Hamamelidales in the Monochlamydeae in subclass Choripetalae of the class Dicotyledones. Based on molecular and morphological data the APW (Angiosperm Phylogeny Website) places the family in the order Proteales as a sister family to the Proteaceae, making them the Northern Hemisphere version of this family (cf. AP-website).
Taxa included

Theoretical introduction to Taxonomy

The only extant genus, Platanus L., 1753, has the type species Platanus orientalis L., 1753. It is divided into two subgenera: the subgenus Castaneophyllum J.-F. Leroy, 1982, with elliptical, penninerved leaves with small scarious, stipules, that only includes Platanus kerrii Gagnep., 1939, an isolated relict species that represents the genus’ evolutionary basal branch and which is the sister group of the other species, which comprise the subgenus Platanus.
Scientific name Common name Distribution Flowers Notes
Platanus acerifolia Willd.—Sp. Pl., ed. 4 [Willdenow] 4(1): 474. 1805 Maple-leaved plane ?
Platanus gentryi Nixon & J.M. Poole, 2003 Gentry’s plane western Mexico ? Subgenus Platanus
Platanus × hispanica
(P. occidentalis × P. orientalis;
sin. P. × acerifolia, P. × hybrida) London plane, hybrid plane Originated in cultivation 1-6 Subgenus Platanus
Platanus kerrii Gagnep., 1939. Kerr’s plane Laos, Vietnam, probably south China 10-12 Subgenus Castaneophyllum
Platanus lindeniana Chiapas plane, Oaxaca plane southeast Mexico ? Subgenus Platanus
Platanus mexicana Moric., 1837[3] Mexican Plane, Mexican sycamore northeast and central Mexico 1-4 Subgenus Platanus
Platanus occidentalis L., 1753[4] American sycamore, American plane, buttonwood, occidental plane, Western plane, Ghost tree, water beech Eastern North America 1-2 Subgenus Platanus
Platanus orientalis L., 1753 [5] Oriental Plane Southeastern Europe, Near East, Iran, central Asia, Pakistan, India 3-6 Subgenus Platanus
Platanus racemosa Nutt., 1842 (= P. californica Benth., 1844) California sycamore, western sycamore, aliso California and Mexico 3-7 Subgenus Platanus
Platanus rzedowskii Nixon & J.M. Poole, 2003 Rzedowski’s plane eastern Mexico 1-2 Subgenus Platanus
Platanus wrightii S. Watson, 1875 Wright’s plane, Arizona sycamore or alamo Arizona, New Mexico, northwestern Mexico 2-4 Subgenus Platanus
Hybrids
Bark of P. orientalis

The London plane-tree or hybrid plane has long been considered a hybrid derived from the cross between P. occidentalis and P. orientalis, despite this its origin is not clear. Some experts think it originated in London and others in Spain or even in natural or cultivated hybrid form (or not) in Turkey. The question has not been investigated with modern molecular methods. As a consequence, even its nomenclature is hotly debated, to the extent that Anglo-Saxon authors deny the priority of the name used in Spain (following Maria da Luz de Oliveira Tavares Monteiro da Rocha Afonso, 1990, see References). The plant is not found in the wild, though it appears in a naturalized form along the banks of rivers and streams.

Hybrid (?) Platanus × hispanica Mill. ex Münchh., 1770 (= P. orientalis var. acerifolia Aiton, 1789; P. hybrida Brot., 1804; P. vulgaris Spach, 1841, nom. illeg.; P. × acerifolia.

Other names proposed for hybrids that are probably synonymous with the above, which is the only name in English, and which represent smaller minorities are:

Hybrid Platanus × cantabrigensis A.Henry, 1919
Hybrid Platanus × parviloba A.Henry, 1919

The references consulted do not agree as to whether the fruit is a nucule or achene, the difference between the two ultimately depends on the size of the pericarp and the extent of its lignification. The fruit is dry, indehiscent, monocarpelar and monospermatic.
References

Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 6 July 2013.
Christenhusz, M.J.M. & Byng, J.W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
Other names: P. lindeniana M. Martens & Galeotti, 1843; P. mexicana var. peltata Jaennicke, 1899; P. chiapensis Standl., 1919; P. oaxacana Standl., 1919; P. mexicana var. interior Nixon & J.M. Poole, 2003).
Other names: P. lobata Moench, 1794; P. excelsa Salisb., 1796; P. vulgaris var. angulosa Spach, 1841; P. integrifolia Hort. ex K. Koch, 1872; P. orientalis var. laciniata Kuntze, 1891; P. orientalis var. palmeri Kuntze, 1891; P. pyramidalis Hort. ex Dippel, 1893; P. glabrata Fernald, 1901; P. densicoma Dode, 1908; P. occidentalis f. attenuata Sarg., 1919.

Other names: P. palmata Moench, 1794; P. umbrosa Salisb., 1796; P. cuneata Willd., 1797; P. elongata Steud., 1821; P. undulata Steud., 1821; P. macrophylla Cree ex W.H. Baxter, 1839; P. nepalensis Hort. ex W.H. Baxter, 1839; P. digitata Hort. ex Steud., 1841; P. vulgaris Spach, 1841; P. algeriensis Hort. ex K.Koch, 1872; P. laciniata Hort. ex K.Koch, 1872; P. nana Hort. ex K.Koch, 1872; P. reuteri Hort. ex K.Koch, 1872; P. umbraculifera Hort. ex K. Koch, 1872; P. insularis Kotschy ex Koehne, 1893; P. pyramidalis Bolle ex Koehne, 1893; P. vitifolia Dippel, 1893; P. cretica Dode, 1908; P. orientalior Dode, 1908.

Kubitzki, K. (1993). "Platanaceae.". Kubitzki, K., Rohwer, J.G. & Bittrich, V. (Editores). The Families and Genera of Vascular Plants. II. Flowering Plants - Dicotyledons. Springer-Verlag: Berlín. ISBN 978-3-540-55509-4.
Rocha Afonso, M.L. (1990). "Platanus". S. Castroviejo et al.(Editores). Flora Iberica Vol. II. C.S.I.C. ISBN 978-84-00-07034-2.
Watson, L. & Dallwitz, M.J. (1992). "The families of flowering plants: descriptions, illustrations, identification, and information retrieval. Version: 29th July 2006". Archived from the original on 3 January 2007. Retrieved 31 January 2007.