Pygmaeocereus bylesianus, synonym Haageocereus bylesianus, is a critically endangered species of cactus from Peru.[2][1][3]
| Pygmaeocereus bylesianus | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| Clade: | Tracheophytes |
| Clade: | Spermatophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Subfamily: | Cactoideae |
| Tribe: | Cereeae |
| Subtribe: | Trichocereinae |
| Genus: | Pygmaeocereus |
| Species: | P. bylesianus |
| Binomial name | |
| Pygmaeocereus bylesianus Andreae & Backeb. | |
| Synonyms[2] | |
| |
Description
editPygmaeocereus bylesianus has spherical to short cylindrical dark green shoots up to 8 cm (3.1 in) long and 2 cm (0.79 in) in diameter. The shoots branch from the base and form small pads. There is a fleshy tap root. The 12 to 14 ribs are initially notched and later divided into clear cusps. The 10 to 15 radiating dark thorns turn gray with age. They are 3 to 7 mm (0.12 to 0.28 in) long and usually not distinguishable into central and radial spines. Occasionally 1 to 2 cm long central spines are formed.[4] The broad, funnel-shaped, scented, white flowers are around 15 cm long. They have a very slim and long flower tube. They only last 24h and open at night.[5] The spherical fruits are red and about 15 mm (0.59 in) in size. They are thick-walled and tear open lengthways or dry up. The plants grow very slowly and in cultivation require very well-draining growth media to avoid rots.[5]
Taxonomy
editThe first description was in 1957 by Wilhelm Andreae and Curt Backeberg. The epithet of the species is named after the British cactus collector Ronald S. Byles.[4]
Distribution
editConservation
editIn the IUCN's Red List of Threatened Species, the species is classified as "Critically Endangered (CR)".[6]
References
edit- 1 2 Cáceres, F. (2013). "Pygmaeocereus bylesianus". IUCN Red List of Threatened Species. 2013 e.T152527A646914. doi:10.2305/IUCN.UK.2013-1.RLTS.T152527A646914.en. Retrieved 20 November 2021.
- 1 2 "Pygmaeocereus bylesianus Andreae & Backeb." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2024-12-28.
- ↑ "Pygmaeocereus bylesianus in Tropicos".
- 1 2 Wilhelm Andreae and Curt Backeberg (1957) National Cactus and Succulent Journal. Volume 12, pages. 86–87.
- 1 2 3 "Pygmaeocereus bylesianus Andreae & Backeb". Encyclopedia of Cacti. Encyclopedias of Living Forms. Retrieved 23 August 2020.
- ↑ "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. 2011-05-05. Retrieved 2023-09-19.
External links
edit
Media related to Pygmaeocereus bylesianus at Wikimedia Commons
Data related to Pygmaeocereus bylesianus at Wikispecies
