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Ornithogalum

Ornithogalum
Ornithogalum umbellatum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Asparagaceae
Subfamily: Scilloideae
Tribe: Ornithogaleae
Genus: Ornithogalum
L.[1]
Type species
Ornithogalum umbellatum
Species

See text.

Synonyms[2]
List
    • Albucea Rchb.
    • Aspasia Salisb.
    • Avonsera Speta
    • Beryllis Salisb.
    • Brizophile Salisb. nom. superfl.
    • Caruelia Parl.
    • Cathissa Salisb.
    • Celsia Heist. ex Fabr. nom. illeg.
    • Eliokarmos Raf.
    • Elsiea F.M.Leight.
    • Eustachys Salisb. nom. illeg.
    • Fenelonia Raf.
    • Galtonia Decne.
    • ×Honogalum Holub
    • Honorius Gray
    • Ifuon Raf.
    • Lomaresis Raf.
    • Loncomelos Raf.
    • Loncoxis Raf.
    • Melomphis Raf.
    • Myanthe Salisb.
    • Myogalum Link
    • Neopatersonia Schönland
    • Nicipe Raf.
    • Parthenostachys Fourr.
    • Phaeocles Salisb.
    • Raphelingia Dumort.
    • Raxamaris Raf.
    • Tomoxis Raf.
    • Tritriela Raf.
    • Virdika Adans.
Linnaeus' description of Ornithogalum 1753

Ornithogalum is a genus of perennial plants mostly native to southern Europe and southern Africa[3] belonging to the family Asparagaceae. Some species are native to other areas such as the Caucasus.[4] Some species are classified as noxious invasive weeds in some portions of North America. Growing from a bulb, species have linear basal leaves and a slender stalk, up to 30 cm tall, bearing clusters of typically white star-shaped flowers, often striped with green. The common name of the genus, star-of-Bethlehem, is based on its star-shaped flowers, after the Star of Bethlehem that appears in the biblical account of the birth of Jesus. The number of species has varied considerably, depending on authority, from 50 to 300.

Description

Ornithogalum species are perennial bulbous geophytes with basal leaves. Sensu lato, the genus has the characteristics of the tribe Ornithogaleae as a whole, since the tribe is monotypic in that sense. Sensu stricto, the genus is characterised by long linear to oblong-lanceolate (lance-shaped) leaves, sometimes with a white longitudinal band on the adaxial (upper) side, an inflorescence that is corymbose or pseudocorymbose, tepals that are white with a longitudinal green band only visible on the abaxial (lower) side, a capsule that is obovate or oblong, and truncate with six noticeable ribs in section and seeds that are globose with a prominently reticulate (net-like pattern) testa.[5] The bulbs are ovoid with free or concrescent scales.[6]

The longitudinal band on the leaves is thought to be caused by an interruption of palisade tissue in the central portion of the leaf. This is an apomorphy that was not present in the early lineage of this clade, but is also seen in some Albuca species.[5]

Taxonomy

Ornithogalum was originally described by Linnaeus in 1753, with 12 species, which he placed in the Hexandria Monogynia (six stamens, one carpel).[1] When Michel Adanson formed the family Liliaceae in 1763, he placed Ornithogalum there, where it largely remained till this very large family was dismembered towards the end of the 20th century. Specifically, he included the genus with the onions (now Allioideae).[7]

By the 1870s, as Baker describes in his revision of the family,[8] the taxonomy of Liliaceae had become vast and complicated. Baker placed Ornithogalum in the tribe Scilleae,[9] one of eight tribes into which he divided the Liliaceae. He then further subdivided the genus into seven subgenera. Of those, the first, Heliocharmos, corresponds to the modern Ornithogalum sensu stricto, with 23 species.[10]

Later, in the United Kingdom, Bentham and Hooker published their volume on the Liliaceae in Latin in 1883.[11] They divided the family into 20 tribes and placed Ornithogalum in the tribe Scilleae with 19 other genera, and indicated 70 species existed.[12] In the German literature the taxonomic system of Engler completed its classification of the Liliaceae in 1888.[13] He divided the family into 12 subfamilies and subordinate tribes. Ornithogalum was then placed in the subfamily Lilioideae and tribe Scilleae together with 21 other genera. The 70 species of Ornithogalum were then further divided into six sections,[14] with section Heliocharmos corresponding to Baker's subgenus.

Ornithogalum is one of four genera in the tribe Ornithogaleae, the largest tribe within the subfamily Scilloideae of the Asparagaceae.[15] Historically, it was treated as part of the subfamily Ornithogaloideae of Hyacinthaceae, now obsolete terms. The preferred treatment is to consider the Hyacinthaceae as subfamily Scilloideae of the Asparagaceae. The original subfamilies within Hyacinthaceae became tribes of subfamily Scilloideae. Thus subfamily Ornithogaloideae became tribe Ornithogaleae.[15][5]

The precise taxonomy of the Ornithogaloideae/Ornithogaleae has been problematic since at least the time of Linnaeus.[16] The Ornithogaloideae were one of four major clades within the Hyacinthaceae.[17] Phylogenetic analysis subsumed all of that subfamily into the genus Ornithogalum with about 300 species. This sensu lato reduction of Speta's 14 genera[18] into one was not widely accepted, though they were polyphyletic, and had a number of problems. (This also had the effect of eliminating Galtonia as a genus, under which a number of Ornithogalum species are still sold.)[5]

Further analysis with wider sampling (70 compared to 40 taxa) and a third plastid region (matK) revealed the presence of three clades (A, B and C) within Ornithogaleae/Ornithogalum. Consequently, a new classification was proposed with three tribes and four genera, Ornithogalum corresponding to clade C, placed in tribe Ornithogaleae, but further subdivided into subgenera and sections, with 160 species.[19][5] Galtonia was retained as a taxon, but at the subgenus level. An alternative approach was suggested by combining plastid gene sequences with nuclear DNA sequences, morphology, and biogeography.[5] This supported Manning's clade C within which Ornithogalum was contained, but the very large subgenus Ornithogalum was noted to still be heterogeneous, which they had managed by treating it as seven sections. This study suggested reversing the sensu lato (lumping) approach of Manning et al., reverting to separate genera (splitting), thus resurrecting Galtonia.

The sensu stricto classification of Martinez-Azorin et al. (2011) reduces the number of species to 50 as originally proposed by Speta.[18] Thus, any consideration of the genus needs to be examined as to whether it refers to sensu stricto, the 50 species considered by Speta (1998) and Martinez-Azorin et al. (2011), or sensu lato, the much larger genus envisaged by Manning et al. (2009).

Subdivision

This very large genus has long been divided into many subgenera. The Flora Europaea (1980) lists 15 subgenera, many of which had at various times been separate distinct genera.[6] Having originally subsumed all of the Ornithogaleae genera into the single genus Ornithogalum,[17] Manning et al. (2009) later subdivided this now very large genus into four subgenera after resurrecting three of the original subsumed genera (Albuca, Pseudogaltonia, Dipcadi).[19] As proposed by them the genus has the following structure:

  • subgenus Avonsera (Speta) J.C.Manning & Goldblatt (monotypic: Ornithogalum convallarioides)
  • subgenus Galtonia (Decne.) J.C.Manning & Goldblatt (7 species)
  • subgenus Aspasia (Salisb.) Oberm.[20] (30 species)
  • subgenus Ornithogalum (7 sections, 120 species)

Species

Of the roughly 180 species, the best known are O. umbellatum, O. saundersiae, O. arabicum, and O. thyrsoides.[21]

Species formerly placed in Galtonia include:[22]

Etymology

The Latin genus name ornithogalum derives from Greek ὀρνιθόγαλον ornithogalon referring to ornithogalum umbellatum, itself deriving from ὄρνις ornis "bird" (GEN ὄρνιθος ornithos) and γάλα gala "milk".[23][24][25] The name is thought to be related to the white colour of the flowers;[20][26] in some species, they resemble bird droppings.[26] The possible (non-attested) alternative form in ancient Greek ὀρνιθογάλη ornithogalē seems to be the source of classical Latin ornithogale as used by Pliny the Elder.[27][28]

Distribution and habitat

When the genus is broadly circumscribed, as for example by Plants of the World Online, species are widely distributed over several continents including Africa (other than the tropics), Madagascar, Europe, and temperate Asia (as far as Afghanistan).[2]

Uses

Vase of cut Ornithogalum thyrsoides flower stems

Ornithogalum species may be sold as cut flowers, particularly O. arabicum, O. dubium, O. saundersiae, and O.thyrsoides.[29] They are also sold as ornamental garden flowers.

Toxicity and use in alternative medicine

Some of the plants in the genus are poisonous, and have been known to kill grazing animals. Others are edible and used as vegetables. The bulbs contain alkaloids[30] and cardenolides,[3] which are toxic.

Ornithogalum has been listed as one of the 38 plants used to prepare Bach flower remedies,[31] a kind of alternative medicine promoted for its effect on health. However, according to Cancer Research UK, "there is no scientific evidence to prove that flower remedies can control, cure or prevent any type of disease, including cancer".[32]

See also

References

  1. ^ a b Linnaeus 1753, Vol. 1. Hexandria Monogynia pp. 306–308.
  2. ^ a b "Ornithogalum L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2020-05-06.
  3. ^ a b "Ornithogalum Linnaeus". Flora of North America vol. 26. www.eFlora.org. Retrieved 12 April 2015.
  4. ^ "Ornithogalum L". Ornamental Plants From Russia. www.eFlora.org. Retrieved 12 April 2015.
  5. ^ a b c d e f Martinez-Azorin et al. 2011.
  6. ^ a b Tutin et al 1980, Ornithogalum L. pp. 35–40.
  7. ^ Adanson 1763, p. 50.
  8. ^ Baker 1871.
  9. ^ Baker 1873, Scilleae: Ornithogalum pp. 257–285.
  10. ^ Baker 1873, Ornithogalum: Heliocharmos pp. 262–269.
  11. ^ Bentham & Hooker 1883.
  12. ^ Bentham & Hooker 1883, Liliaceae; Scilleae Ornithogalum pp. 815–816.
  13. ^ Engler & Prantl 1888.
  14. ^ Engler & Prantl 1888, Engler Liliaceae: Ornithogalum p. 67.
  15. ^ a b Stevens 2015.
  16. ^ Stedje 1989.
  17. ^ a b Manning et al. 2004.
  18. ^ a b Speta 1998.
  19. ^ a b Manning et al. 2009.
  20. ^ a b Obermeyer 1978.
  21. ^ "Ornithogalum". International Flower Bulb Centre. Archived from the original on 2015-09-23. Retrieved 13 April 2015.
  22. ^ "Galtonia Decne". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2020-10-26.
  23. ^ Schubert & Wagner 1988.
  24. ^ ὀρνιθόγαλον, ὄρνις, γάλα. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project.
  25. ^ Liddell & Scott 1940.
  26. ^ a b Gilbert-Carter 1955, p. 59.
  27. ^ Saalfeld 1884.
  28. ^ ornithogale. Charlton T. Lewis and Charles Short. A Latin Dictionary on Perseus Project.
  29. ^ "Ornithogalum". Grower Direct.
  30. ^ "Ornithogalum umbellatum – L." Plants For A Future.
  31. ^ Vohra 2005, p. 3.
  32. ^ "Flower remedies". Cancer Research UK. Retrieved 12 July 2019.

Bibliography

Historical sources

Databases

Data related to Ornithogalum at Wikispecies

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