Lepidium amissum, also known as Waitakere scurvy grass, is an extinct species of plant in the family Brassicaceae. The plant was first described by Peter de Lange and Peter Brian Heenan in 2013, and was formerly endemic to the sea cliffs of the Waitākere Ranges of West Auckland, New Zealand.
| Lepidium amissum | |
|---|---|
| |
| Holotype from the herbarium of the Auckland War Memorial Museum | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Brassicales |
| Family: | Brassicaceae |
| Genus: | Lepidium |
| Species: | †L. amissum
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| Binomial name | |
| †Lepidium amissum | |
Taxonomy
editThe species was formally described in 2013 by Peter de Lange and Peter Brian Heenan, based on specimens collected from cliff faces of the coastal Waitākere Ranges by Thomas Cheeseman, with the first known specimen collected in December 1870.[3] Prior to identification as a species in 2013, the specimens had been identified as Lepidium obtusatum.[3] Cheeseman briefly mentions the species in the 1906 edition of the Manual of the New Zealand flora, stating that L. obtusatum can be found on "sea-cliffs to the north of the Manukau Harbour, rare."[4] The species epithet amissum is derived from the Latin word amissus, meaning lost, referring to its extinction.[3]
Due to the degradation of herbarium specimens, a genetic analysis of the plant was not able to be undertaken for the species when it was discovered.[3]
Description
editLepidium amissum was a perennial herb with sparingly leafy stems, and lacked a rhizome.[3] The plant had untidy leafy branches, with deeply toothed dark green leaves. The flowers of the species were white with four stamens.[5]
Extinction
editThe last known specimen was collected in 1917. The plant's extinction may have been caused by the coastline modifying effects of the kauri logging industry of the 19th century, or due to the effects of its discovery by Cheeseman.[3]
Distribution and habitat
editThe species was endemic to New Zealand, thought to grow exclusively along sea cliffs of the coastline of the Waitākere Ranges of West Auckland, New Zealand.[3][6]
References
edit- ^ "Lepidium amissum de Lange & Heenan". New Zealand Threat Classification System. Retrieved 11 September 2024.
- ^ de Lange, P. (2014). "Lepidium amissum". IUCN Red List of Threatened Species. 2014: e.T62798275A62798278. Retrieved 11 September 2024.
- ^ a b c d e f g de Lange, P. J.; Heenan, P. B.; Houliston, G. J.; Rolfe, J. R.; Mitchell, A. D. (17 June 2013). "New Lepidium (Brassicaceae) from New Zealand". PhytoKeys. 24 (24): 1–147. doi:10.3897/PHYTOKEYS.24.4375. ISSN 1314-2003. PMC 3689132. PMID 23794938. Wikidata Q21192509.
- ^ Cheeseman, T. F. (1906), Manual of the New Zealand flora, J. Mackay, Govt. Printer, doi:10.5962/BHL.TITLE.12003, OCLC 4397520, OL 234533M, Wikidata Q51396409
- ^ "Lepidium amissum". New Zealand Plant Conservation Network. Retrieved 11 September 2024.
- ^ Simpkins, Emma; Woolly, Jacinda; de Lange, Peter; Kilgour, Cameron; Cameron, Ewen; Melzer, Sabine (December 2022). Conservation Status of Vascular Plant Species in Tāmaki Makaurau / Auckland (PDF) (Report). Retrieved 11 September 2024.