Leptochiton (plant)

Leptochiton; Temporal range: 24.46 –0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Late Oligocene – Recent
	Leptochiton quitoensis
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Asparagales
Family:	Amaryllidaceae
Subfamily:	Amaryllidoideae
Tribe:	Hymenocallideae
Genus:	Leptochiton; Sealy
Type species
	Leptochiton quitoensis; (Herb.) Sealy
	Leptochiton is native to Ecuador and Peru

Leptochiton is a genus of South American plants in the Amaryllis family.^[4]^[5]

There are 2 known species, native to Ecuador and Peru:^[6]

Leptochiton helianthus (Ravenna) Gereau & Meerow - Peru (Cajamarca)
Leptochiton quitoensis (Herb.) Sealy - Ecuador (Guayas, Loja), Peru

Description

Generative characteristics

Leptochiton has phytomelanous seeds, which is unique among the tribe Hymenocallideae.^[7]

Cytology

The diploid chromosome count is 2n = 24 or 2n = 34.^[7]

Phylogeny

It is closely related to Ismene, to which it shared a common ancestor 26.14 million years ago. It is the sister group to Hymenocallis, from which it separated 24.46 million years ago.^[1]

Hymenocallideae

	Hymenocallis

	Leptochiton

Ismene

References

^ ^a ^b Meerow, A. W., Gardner, E. M., & Nakamura, K. (2020). "Phylogenomics of the Andean tetraploid clade of the American Amaryllidaceae (subfamily Amaryllidoideae): unlocking a polyploid generic radiation abetted by continental geodynamics." Frontiers in Plant Science, 11, 582422.
^ illustration from Baker, John Gilbert. 1878. Curtis's Botanical Magazine 104: plate 6397, as Ismene tenuifolia
^ "Leptochiton Sealy". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 30 July 2023.
^ Sealy, Joseph Robert. 1937. Botanical Magazine 160: plate 9491
^ Jørgensen, P. M., M. H. Nee & S. G. Beck. (eds.) 2014. Catálogo de las plantas vasculares de Bolivia, Monographs in systematic botany from the Missouri Botanical Garden 127(1–2): i–viii, 1–1744.
^ Kew World Checklist of Selected Plant Families
^ ^a ^b Meerow, A. W., Guy, C. L., Li, Q. B., & Yang, S. L. (2000). "Phylogeny of the American Amaryllidaceae based on nrDNA ITS sequences." Systematic Botany, 708-726.

[Meerow_et_al.,_2020-1] Meerow, A. W., Gardner, E. M., & Nakamura, K. (2020). "Phylogenomics of the Andean tetraploid clade of the American Amaryllidaceae (subfamily Amaryllidoideae): unlocking a polyploid generic radiation abetted by continental geodynamics." Frontiers in Plant Science, 11, 582422.

[2] ustration from Baker, John Gilbert. 1878. Curtis's Botanical Magazine 104: plate 6397, as Ismene tenuifolia

[POWO,_2023-3] "Leptochiton Sealy". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 30 July 2023.

[4] Sealy, Joseph Robert. 1937. Botanical Magazine 160: plate 9491

[5] Jørgensen, P. M., M. H. Nee & S. G. Beck. (eds.) 2014. Catálogo de las plantas vasculares de Bolivia, Monographs in systematic botany from the Missouri Botanical Garden 127(1–2): i–viii, 1–1744.

[6] Kew World Checklist of Selected Plant Families

[Meerow_et_al.,_2000-7] Meerow, A. W., Guy, C. L., Li, Q. B., & Yang, S. L. (2000). "Phylogeny of the American Amaryllidaceae based on nrDNA ITS sequences." Systematic Botany, 708-726.

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