Acer lobelii

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Acer lobelii
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Sapindales
Family: Sapindaceae
Genus: Acer
Species: A. lobelii
Binomial name
Acer lobelii
Ten.
Synonyms

Acer platanoides subsp. lobelii (Ten.) Gams
Acer cappadocicum subsp. lobelii (Ten.) De Jong.

Acer lobelii (Lobel's Maple) is a rare maple native to southern Italy and the western Balkans.[1][2] Synonyms include Acer platanoides subsp. lobelii (Ten.) Gams[1] and Acer cappadocicum subsp. lobelii (Ten.) De Jong.[3]

Description[edit]

Acer lobelii is a medium-sized deciduous tree growing to 20–25 metres (66–82 ft) tall with a narrow, erect crown, one of very few trees with a naturally fastigiate form. The bark is greenish-grey, smooth in young trees, becoming browner and shallowly furrowed in mature trees. The shoots are green covered by a thick glaucous blue-white wax at first, this wearing off within a year but the older shoots remaining green for several years.

The leaves are opposite, palmately lobed with five lobes, 6–12 centimetres (2.4–4.7 in) long and 6–15 centimetres (2.4–5.9 in) across; the lobes are entire or with one or two irregular teeth. The leaf stems bleed a milky latex when broken.

The flowers are in corymbs, yellow-green with five sepals 3–4 millimetres (0.12–0.16 in) long; flowering occurs in early spring. The fruit is a double samara with two winged seeds, the seeds are disc-shaped, strongly flattened, 6–11 millimetres (0.24–0.43 in) across and 2–3 millimetres (0.079–0.118 in) thick. The wings are 2.5 centimetres (0.98 in) long, widely spread, approaching a 180° angle.[2][4][5][6]

Distribution[edit]

The species is rare and endangered in Italy, only occurring scattered in small groups in Italian sclerophyllous and semi-deciduous forests habitats.[7] It was widely considered endemic in southern Italy,[2][5][7] but is now also known in the western Balkans (former Yugoslavia),[1] a distribution fairly closely matched by Pinus heldreichii (Bosnian Pine).

It is closely related to, and in some respects intermediate between, Acer cappadocicum, from Asia, and Acer platanoides, from further north in Europe, hence Acer platanoides subsp. lobeli. The suggestion has been made that it could be a natural hybrid between them, but differences from both, notably the strongly glaucous bloom on the young shoots, make treatment as a distinct species more reasonable.[2][5]

Cultivation and uses[edit]

Lobel's Maple is grown as an ornamental tree in northern Europe, valued for its narrow crown which makes it suitable for planting in confined spaces.[5] Many of the trees in cultivation are grafted on Acer cappadocicum rootstocks, shown by the numerous root sprouts with Acer cappadocicum foliage.[2][4]

The horticultural hybrid maple Acer × zoeschense is often cited as having Acer lobelii as one of its parents,[4] though more likely Acer cappadocicum.[5]

References[edit]

  1. ^ a b c Euro+Med Plantbase Project: Acer lobelii
  2. ^ a b c d e Rushforth, K. (1999). Trees of Britain and Europe. Collins. ISBN 0-00-220013-9. 
  3. ^ Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan. ISBN 0-333-47494-5. 
  4. ^ a b c Mitchell, A. F. (1974). A Field Guide to the Trees of Britain and Northern Europe. Collins. ISBN 0-00-212035-6. 
  5. ^ a b c d e Mitchell, A. F. (1982). The Trees of Britain and Northern Europe. Collins. ISBN 0-00-219037-0. 
  6. ^ Bean, W. J. (1976). Trees and Shrubs Hardy in the British Isles 8th ed. 1. John Murray. ISBN 0-7195-1790-7. 
  7. ^ a b Guarino, C., & Napolitano, F. (2006). Community habitats and biodiversity in the Taburno-Camposauro Regional Park. Woodland, rare species, endangered species and their conservation. Forest@ 3 (4): 527-541. p.539: Results. Habitat and species biodiversity.