Perrierosedum is a genus of succulent plant in the family Crassulaceae containing only one species, Perrierosedum madagascariense. It is a critically endangered species endemic to Madagascar.[2]
| Perrierosedum | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Saxifragales |
| Family: | Crassulaceae |
| Genus: | Perrierosedum (A.Berger) H.Ohba |
| Species: | P. madagascariense
|
| Binomial name | |
| Perrierosedum madagascariense | |
| Synonyms[2] | |
| |
Taxonomy and history
editSedum madagascariense was described by French botanist Joseph Marie Henry Alfred Perrier de la Bâthie in 1923. S. madagascariense was placed in Sedum section Perrierosedum, named in honour of Perrier de la Bâthie, in 1930 by Alwin Berger.[3] Sedum sect. Perrierosedum would later be elevated to genus by Japanese botanist Hideaki Ohba in 1978, re-designating the species Perrierosedum madagascariense.[4]
Distribution and habitat
editP. madagascariense is known only from Andringitra Massif in the Haute Matsiatra and Ihorombe regions of south-central Madagascar. It grows on rocky outcrops at altitudes of 1,600 m (5,200 ft) to 2,659 m (8,724 ft).[1]
Description
editP. madagascariense is a small perennial shrub growing 50–80 cm (20–31 in) tall. The branches are hairless and quadrangular. The fleshy leaves are sessile, borne opposite one another, measuring 2.5–5 cm (0.98–1.97 in) by 1.5–2.5 cm (0.59–0.98 in) with finely toothed margins. The inflorescence is a terminal corymbose cyme bearing three to ten flowers. The flowers measure approximately 10 mm (0.39 in) across and are hexamerous or, rarely, pentamerous. The petals are white with a red to orange tint and purple veins.[4][5]
Conservation status
editP. madagascariense is listed as critically endangered by the International Union for the Conservation of Nature under criterion B2ab(iii), based on its small area of occupancy and the decline of its habitat. It is known only from a single location within Andringitra National Park, and the size of the population is unknown. Despite occurring within a protected area, it is threatened by wildfires, grazing, and human disturbance from hikers and rock climbers.[1]
This species has been planted at the Botanical and Zoological Garden of Tsimbazaza in Antananarivo, Madagascar.[1]
References
edit- ^ a b c d e Rabarimanarivo, M. (2024). "Perrierosedum madagascariense". IUCN Red List of Threatened Species. 2024: e.T216490147A216492956. Retrieved 3 August 2024.
- ^ a b "Perrierosedum madagascariense (H.Perrier) H.Ohba". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 3 August 2024.
- ^ Burkhardt, Lotte (2018). Verzeichnis eponymischer Pflanzennamen – Erweiterte Edition [Index of Eponymic Plant Names – Extended Edition] (PDF) (in German). Vol. 2. Berlin: Botanic Garden and Botanical Museum Berlin, Freie Universität Berlin. p. P-10. doi:10.3372/epolist2018. ISBN 978-3-946292-26-5. Retrieved 4 August 2024.
- ^ a b c Descoings, Bernard (2005). "Le genre Perrierosedum (Berger) H. Ohba (Crassulaceae) à Madagascar". Acta Botanica Gallica. 152 (3): 289–292. Bibcode:2005AcBG..152..289D. doi:10.1080/12538078.2005.10515491.
- ^ Eggli, Urs, ed. (2003). "Crassulaceae". Illustrated Handbook of Succulent Plants: Crassulaceae. Springer. p. 196. doi:10.1007/978-3-642-55874-0. ISBN 978-3-642-62629-6.