Acer lobelii

Acer lobelii
Foliage, in Campania, southern Italy
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Sapindaceae
Genus: Acer
Section: Acer sect. Platanoidea
Species:
A. lobelii
Binomial name
Acer lobelii
Ten.
Synonyms[2]
List
    • Acer cappadocicum subsp. lobelii (Ten.) A.E.Murray (1982)
    • Acer pictum subsp. tenorei Pax (1886), not validly published
    • Acer platanoides var. lobelii (Ten.) Loudon (1838)
    • Acer atheniense G.Gordon (1874)
    • Acer cappadocicum var. dissectum (Wesm.) A.E.Murray (1977)
    • Acer lobelii var. dissectum Wesm. in unknown publication
    • Acer lobelii f. striatum Schwer. (1893)
    • Acer platanoides var. integrilobum Tausch (1829)

Acer lobelii, known as Lobel's maple[1][3] or L'Obel's maple,[4] or the Calabrian maple, is a rare species of maple (Acer) in the soapberry family Sapindaceae. It is native to southern Italy.[5] It is named after the Flemish botanist Matthias de l'Obel.[6] The species is closely related to Norway maple (Acer platanoides) and Cappadocian maple (Acer cappadocicum), and has often been treated as a subspecies of either of those, as Acer platanoides subsp. lobelii and Acer cappadocicum subsp. lobelii.[7][3] More recently, it has been considered to be particularly close to the latter, which has also been confirmed by phylogenetic studies.[5][8] Thus, A. cappadocicum most likely represents the westernmost member within the A. cappadocicum complex.[5]

Taxonomy

Acer lobelii is closely related to, and in some respects intermediate between, Acer cappadocicum, from southwestern Asia, and Acer platanoides, from further north in Europe, hence the synonyms cited above. The suggestion has even been made that it could be a natural hybrid between them.[9][6] Nonetheless, A. lobelii is clearly very close to A. cappadocicum in particular: in one phylogenetic study by Nikzat-Siahkolaee and colleagues (2021), A. lobelii clustered fully between samples of A. cappadocicum, suggesting that the species is a western vicariant within that species, and making a treatment as a subspecies seem more appropriate.[8] Still, as of April 2026, Plants of the World Online recognises it as an independent species.[10]

Description

A. lobelii leaf

Acer lobelii is a medium-sized deciduous tree growing 20–25 metres (66–82 ft) tall. Trees in cultivation are often narrow, with an erect, fastigiate crown. The bark is greenish-grey, smooth in young trees, becoming browner and shallowly furrowed in mature trees. The shoots are often 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.[9][6]

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. As with its relatives Acer cappadocicum and Acer platanoides, the leaf stems bleed a milky latex when broken.[9]

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.[9][11][6][12]

Some of the features used to differentiate the species from its close relative A. cappadocicum have proven to be more variably pronounced than previously assumed, making them unreliable. While trees in cultivation are often distinctly narrow as compared to the usually rounder A. cappadocicum, the species can be more broad spreading in the wild, and A. cappadocicum can conversely be very upright as well. The glaucous bloom on young shoots, while more consistently shown by A. lobelii, can also be found in A. cappadocicum. Features that appear to more consistently distinguish A. lobelii from A. cappadocicum are the five rather than seven-lobed leaves of mature trees, shorter peduncles on its inflorescences, as well as the lack of a suckering habit in A. lobelii. Older A. lobelii in cultivation are, however, often grafted on A. cappadocicum, and may therefore have A. cappadocicum suckers surrounding them.[5]

Distribution

The species is rare and endangered in Italy, only occurring scattered in small groups in Italian sclerophyllous and semi-deciduous forest habitats between 200 and 1750 m altitude in the southern Apennine Mountain chain, particularly in beech forests.[13] It is found in the Abruzzo, Basilicata, Calabria, Campania, Lazio and Molise provinces, reaching south into Sila National Park, Calabria. Some sources also consider it to be native to the western Balkans,[14] however, this is unconfirmed, and may have its roots in an erroneous attribution.[5]

Cultivation and uses

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.[6] Many of the trees in cultivation are grafted on Acer cappadocicum rootstocks, shown by the numerous root sprouts with Acer cappadocicum foliage.[9][11]

The horticultural hybrid maple Acer × zoeschense is often cited as having Acer lobelii as one of its parents,[11] though more likely Acer cappadocicum.[6]

References

  1. ^ a b Crowley, D.; Rivers, M.C. (2017). "Acer lobelii". IUCN Red List of Threatened Species. 2017 e.T193529A2242167. doi:10.2305/IUCN.UK.2017-3.RLTS.T193529A2242167.en. Retrieved 20 November 2021.
  2. ^ "Acer lobelii Ten. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2026-04-11.
  3. ^ a b "Acer cappadocicum subsp. lobelii". Retrieved 28 November 2019.
  4. ^ Loudon, J. C. (1838). Arboretum et fruticetum Britannicum. Vol. 1. London: Printed for the author, and sold by Longman, Orme, Brown, Green, and Longmans. p. 444. doi:10.5962/bhl.title.95867. Retrieved 2025-04-19.
  5. ^ a b c d e Crowley, Dan (2020). "Acer lobelii - Trees and Shrubs Online". www.treesandshrubsonline.org. Retrieved 2026-04-11.
  6. ^ a b c d e f Mitchell, A. F. (1982). The Trees of Britain and Northern Europe. Collins. ISBN 0-00-219037-0.
  7. ^ Huxley, A. (1992). New RHS Dictionary of Gardening. Macmillan. ISBN 0-333-47494-5.
  8. ^ a b Nikzat-Siahkolaee, Sedigheh; Sheidai, Masoud; Assadi, Mostafa; Noormohammadi, Zahra; Ghasemzadeh-Baraki, Somayeh (2021-03-01). "Infra-specific variation of Acer cappadocicum (Sapindaceae): morphological and molecular approaches". Brazilian Journal of Botany. 44 (1): 149–163. doi:10.1007/s40415-020-00692-7. ISSN 1806-9959.
  9. ^ a b c d e Rushforth, K. (1999). Trees of Britain and Europe. Collins. ISBN 0-00-220013-9.
  10. ^ "Acer lobelii Ten. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2026-04-11.
  11. ^ a b c Mitchell, A. F. (1974). A Field Guide to the Trees of Britain and Northern Europe. Collins. ISBN 0-00-212035-6.
  12. ^ Bean, W. J. (1976). Trees and Shrubs Hardy in the British Isles 8th ed. Vol. 1. John Murray. ISBN 0-7195-1790-7.
  13. ^ 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.
  14. ^ Euro+Med Plantbase Project: Acer lobelii
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