Echinocereus pacificus is a species of cactus native to Mexico.
| Echinocereus pacificus | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Subfamily: | Cactoideae |
| Genus: | Echinocereus |
| Species: | E. pacificus
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| Binomial name | |
| Echinocereus pacificus | |
| Synonyms | |
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Description
editEchinocereus pacificus grows solitary, in clumps of 30–60 cm (12–24 in) in diameter containing around 100 stems. Stems are cylindrical to elongated shoots 5 to 6 cm (2.0 to 2.4 in) long, with 10 to 12 ribs and a 4 to 5, strong, upright central spine that is white or light gray with a darker tip, measuring 25 mm (0.98 in) in length. Additionally, there are 10 to 12 spreading, straight, whitish or grayish radial spines that are 5 to 10 mm (0.20 to 0.39 in) long. The flowers of are cup-shaped and deep red orange and 2.5 to 4 cm (0.98 to 1.57 in) in diameter. They appear in the upper half of the shoots. The spherical, fleshy fruits are spiny, 1.2 to 1.6 mm (0.047 to 0.063 in) long.[2] Chromosome count is 4n=44[3]
Subspecies
editThere are two recognized subspecies:[4]
| Image | Scientific name | Distribution |
|---|---|---|
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Echinocereus pacificus subsp. mombergerianus (G.Frank) W.Blum, W.Rischer & Rutow | Mexico (N. Baja California) |
| Echinocereus pacificus subsp. pacificus | Mexico (NW. Baja California) |
Distribution
editPlants are found growing on granite slopes and xeric scrub in Baja California, Mexico at elevations around 110 to 2600 meters. Plants are found growing along with Adenostoma fasciculatum, Stipa speciosa, Arctostaphylos peninsularis, Dudleya pulverulenta, Lotus rigidus, Nolina microcarpa, Pinus monophylla, Rhamnus crocea, Opuntia phaeacantha, Cylindropuntia acanthocarpa, Pinus quadrifolia, Ferocactus viridescens and Malosma laurina.[5]
Taxonomy
editThe plant was first described by George Engelmann in 1886 as Cereus phoeniceus var. pacificus. It was elevated to a species in 1922 by Nathaniel Lord Britton and Joseph Nelson Rose.
References
edit- ^ Baker, M. (2017) [amended version of 2013 assessment]. "Echinocereus pacificus". IUCN Red List of Threatened Species. 2017: e.T152781A121488043. doi:10.2305/IUCN.UK.2017-3.RLTS.T152781A121488043.en.
- ^ Britton, N.L.; Rose, J.N. (1963). The Cactaceae: Descriptions and Illustrations of Plants of the Cactus Family. Descriptions and Illustrations of Plants of the Cactus Famil. Dover Publications, Incorporated. p. 12. ISBN 978-0-486-21192-3. Retrieved 2024-08-03.
- ^ Baker, M. (2006). "A new florally dimorphic hexaploid, Echinocereus yavapaiensis sp. nov. (section Triglochidiatus, Cactaceae) from central Arizona". Plant Systematics and Evolution. 258 (1–2): 63–83. doi:10.1007/s00606-005-0390-9. ISSN 0378-2697.
- ^ "Echinocereus pacificus (Engelm.) Britton & Rose". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2024-06-29.
- ^ Rose, Britton &. "Echinocereus pacificus". Consortium of Midwest Herbaria (in Latin). Retrieved 2024-07-31.
External links
edit
Data related to Echinocereus pacificus at Wikispecies
