Hedlundia lonetalensis

Hedlundia lonetalensis
Flowering Hedlundia lonetalensis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Embryophytes
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rosaceae
Genus: Hedlundia
Species:
H. lonetalensis
Binomial name
Hedlundia lonetalensis
(S.Hammel & Haynold) Sennikov & Kurtto[2]
     It is endemic to Baden-Württemberg, Germany[2]
Synonyms[2]
  • Pyrus lonetalensis (S.Hammel & Haynold) M.F.Fay & Christenh.
  • Sorbus lonetalensis S.Hammel & Haynold

Hedlundia lonetalensis, the Lonetal whitebeam,[3] is a species of tree in the family Rosaceae endemic to Baden-Württemberg, Germany.[2] It is extremely rare[4] and threatened with extinction.[1]

Description

Fruiting Hedlundia lonetalensis tree
Detail of Hedlundia lonetalensis leaf

Vegetative characteristics

Hedlundia lonetalensis is a small, up to 6 m tall tree with up to 21 cm wide trunks.[5] If it is cut down, it produces multiple trunks.[3] The plain bark is greyish-brown.[5]

Generative characteristics

The 4.5–6 cm wide inflorescence bears 30–40 flowers.[3] The strongly pubescent ovary bears white hair.[5] The 6–7 cm wide infructescence bears 10–25[3] small, round, apple-shaped,[6] carmine red accessory fruits.[3] Fertile fruits produce 1–2 brown, 6mm long, 3 mm wide, and 2.5 mm tall seeds.[5]

Cytology

The chromosome count is 2n = 68.[7] It is a tetraploid plant.[8][9][7]

Taxonomy

It was first published as Sorbus lonetalensis S.Hammel & Haynold by Steffen Hammel and Bernd Haynold in 2015.[5][10] The type specimen was collected by Steffen Hammel on the 9th of September 2014 south of Herbrechtingen-Bissingen, Baden-Württemberg, Germany at an elevation of 480 m above sea level.[7] The species was moved to the genus Hedlundia Sennikov & Kurtto as Hedlundia lonetalensis (S.Hammel & Haynold) Sennikov & Kurtto by Alexander Nikolaevitsch Sennikov and Arto Kurtto in 2017.[7][11] The plant was first found by Thomas Meyer[12][3] and was first photographed on the 31st of May 2014.[3]

Etymology

The genus name Hedlundia honours the Swedish botanist Johan Teodor Hedlund. The specific epithet lonetalensis refers to the Lonetal valley in Baden-Württemberg, Germany.[13]

Distribution and habitat

It is endemic to Baden-Württemberg, Germany[2] where it occurs in a single location in the south of Herbrechtingen-Bissingen in the Lonetal in between the edge of woodland and open grassland.[1]

Ecology

Alsophila caterpillars feed on Hedlundia lonetalensis leaves.[5]

Conservation

Hedlundia lonetalensis is extremely rare.[4][14] It is a critically endangered species with only 10 mature individuals occurring on an area of 4 km2 south of Herbrechtingen-Bissingen in the Lonetal.[1] The species doesn't have special legal protection,[14] but the forest where it occurs has been placed under protection.[3] It is threatened by darkening forests due to natural succession and its regeneration is limited by grazing.[1] Only few individuals are able to reproduce, as they fail to flower under dark conditions.[5] The habitat, as well as the number of mature individuals are declining.[1] Three specimens were given to the Botanischer Garten der Universität Ulm for the purpose of ex-situ conservation.[5]

References

  1. 1 2 3 4 5 6 Beech, E., Meyer, N. & Rivers, M.C. 2017. Sorbus lonetalensis. The IUCN Red List of Threatened Species 2017: e.T91071449A91071571. https://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T91071449A91071571.en. Accessed on 24 July 2026.
  2. 1 2 3 4 5 Hedlundia lonetalensis (S.Hammel & Haynold) Sennikov & Kurtto. (n.d.). Plants of the World Online. Retrieved July 24, 2026, from https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77164924-1
  3. 1 2 3 4 5 6 7 8 Meyer, T. (n.d.). Lonetal- Mehlbeere (Sorbus lonetalensis S. Hammel & Haynold). Blumen in Schwaben. Retrieved July 24, 2026, from https://www.blumeninschwaben.de/Zweikeimblaettrige/Rosengewaechse/lonetal.htm
  4. 1 2 Deutsches Zentrum für Luft- und Raumfahrt e. V. & Bundesamtes für Naturschutz (BfN). (2026, January 14). Sorbus lonetalensis S. Hammel & Haynold. Rote Liste Zentrum. Retrieved July 24, 2026, from https://www.rote-liste-zentrum.de/detailseite/?species_uuid=0dca09bb-6d5d-4414-86b1-1d8c19956405
  5. 1 2 3 4 5 6 7 8 Hammel, S., & Haynold, B. (2015). Sorbus lonetalensis–eine neue Mehlbeere aus Baden-Württemberg. Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 171, 077-094.
  6. ↑ Meyer, N., & Hammel, S. (2023). Besondere Arten der Gattung Sorbus: Bemerkungen zu den Eigenheiten der Gattung Sorbus in Baden-Württemberg. Karlsruhe.
  7. 1 2 3 4 Sennikov, A. N., & Kurtto, A. (2017). A phylogenetic checklist of Sorbus sl (Rosaceae) in Europe. Memoranda Societatis pro Fauna et Flora Fennica, 93, 1-78.
  8. ↑ Hammel, S., Haynold, B., Gregor, T., & Paule, J. (2015) Ploidie-Bestimmung baden-württem bergischer Bastard-Mehlbeeren. Jh. Ges. Naturkde. Württemberg 171 S. 69-75
  9. ↑ Meyer, N., & Meierott, L. (2021). Ergänzende Beiträge zur Sorbus-Flora von Bayern. Ber. Bayer. Bot. Ges., 91, 21-48.
  10. ↑ Sorbus lonetalensis S.Hammel & Haynold. (n.d.). International Plant Names Index. Retrieved July 24, 2026, from https://www.ipni.org/n/77157415-1
  11. ↑ Hedlundia lonetalensis (S.Hammel & Haynold) Sennikov & Kurtto. (n.d.-b). International Plant Names Index. Retrieved July 24, 2026, from https://www.ipni.org/n/77164924-1
  12. ↑ Hammel, S., & Haynold, B. (2017, January 28). Die Gattung Sorbus auf der Schwäbischen Alb – Zwischenbericht und Kartierungstipps.
  13. ↑ Blaich, G. (n.d.). Sorbus lonetalensis  S.HAMMEL & HAYNOLD. Retrieved July 24, 2026, from https://www.guenther-blaich.de/pflseite.php?par=Sorbus+lonetalensis
  14. 1 2 Bundesamt für Naturschutz. (n.d.). Sorbus lonetalensis S. Hammel & Haynold. FloraWeb. Retrieved July 24, 2026, from https://www.floraweb.de/php/artenhome.php?suchnr=35367
This page is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.