Ambrosina is a genus in the family
Araceae that consists of only one species, Ambrosina bassii, and the only genus in the tribe Ambrosineae. This species is the smallest terrestrial
aroid in the
Mediterranean, growing only to 8 cm tall. It is usually found growing in woodlands on north faces of hillsides and in humus soil that is covering
limestone. It is distributed in
Sardinia,
Corsica,
Sicily, southern mainland
Italy,
Tunisia, and
Algeria.[3][4][5]
Description
Ambrosina bassii has oval leaves that are 3.5 to 6 cm long and resemble the leaves of many
aroid seedlings. The
inflorescence is 2.5 cm long bent over and has an unusual
spathe. The
spathe is shaped like an egg and is greenish brown with dots on it. Inside the egg shaped
spathe is divided two chambers. In one chamber is contained a single female flower and in the other are 8 to 10 male flowers. The seeds have an
elaiosome.[6] However, seeds are rarely formed, as this species exhibits a low reproductive rate.[7]
Pollen
The inaperturate pollen grains are 26–50 μm big. It disperses as a single grain (monad).[8]
Population genetics
Ambrosina is the only representative of its genus and is quite unique. It has been shown that it has high heterozygosity, as it has an average of two loci per allele. The data represents that genetic variation attributes to differences among populations from different geographical territories. Also, the local anthropogenic fragmentation has caused no time for genetic drift or interbreeding to erode genetic variation, this eventually resulted in generating differences between populations.[9] The
effective population size is low in natural populations.[7]
Phylogeny
It is closely related to the genera Arisarum, Peltandra, and Typhonodorum. Ambrosina is the sister group to Arisarum, from which it separated about 46.1 Million years ago.[1]
The precise relationships are displayed in the following cladogram:[1]
Ambrosineae
Ambrosina
Arisareae
Arisarum
Peltandreae
Typhonodorum
Peltandra
Taxonomy
Species
The genus is monotypic and only consists of Ambrosina bassii.[3]
Varieties
The following three varieties have been described:[3]
Ambrosina roxburghiana Voigt is a synonym of Cryptocoryne retrospiralis (Roxb.) Kunth[12]
Ambrosina spirialis (Retz.) Roxb. is a synonym of Cryptocoryne spiralis (Retz.) Fisch. ex Wydler[13]
Ambrosina unilocularis Roxb. is a synonym of Cryptocoryne retrospiralis (Roxb.) Kunth[12]
Ecology
Visitation of inflorescences
The inflorescences are visited by springtails, Embiidae, earwigs, mites of the genera Penthaleus or Bdella, and millipedes.[7]
Seed dispersal
The seeds are attractive to ants, as the seed is coated in an edible
elaiosome. Due to this edible coating, the ants disperse the seeds.[7][6]
Parasite ecology
Ambrosina foliage may be affected by reddish-brown, 0–1 mm large leaf spots caused by the phytopatogenic fungus Entylomaster dietelianus (Bubák) Vánky & R.G. Shivas (syn. Entyloma dietelianum Bubák[14][15]). Numerous 10–16 μm large spores are embedded whithin the leaf spots. This fungal disease is specific to the family Araceae.[16][17]
Etymology
The generic name Ambrosina honours the brothers
Bartolomeo Ambrosini (1588–1657) and Giacinto Ambrosini (1605–1671).[18]
Conservation
Despite being listed as species of least concern by the IUCN Red List of Threatened Species,[2] it is legally protected in France.[19][2]
^Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.
^Dobignard, D. & Chatelain, C. (2010). Index synonymique de la flore d'Afrique du nord 1: 1-455. Éditions des conservatoire et jardin botaniques, Genève.
^
abBown, Deni (2000). Aroids: Plants of the Arum Family. Timber Press.
ISBN0-88192-485-7.
^Halbritter, H. (2016, November 3). Ambrosina bassii. PalDat - Palynological Database an Online Publication on Recent Pollen. Retrieved February 14, 2023, from
https://www.paldat.org/pub/Ambrosina_bassii/301765
^Geraci, Anna; Raimondo, Francesco Maria; Troia, Angelo (2009-12-01). "Genetic diversity and local population structure in Ambrosina bassii (Araceae, Ambrosineae), a Mediterranean relict species". Biochemical Systematics and Ecology. 37 (6): 737–746.
doi:
10.1016/j.bse.2009.12.002.
ISSN0305-1978.