Mexican Purslane
Portulaca mexicana
Portulaca mexicana is a low-growing succulent plant native to numerous states across Mexico. First described …
Johnston's Purslane (Portulaca johnstonii)
Silhouette: T. Michael Keesey
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Portulaca johnstonii: Rare Succulent of Northern Mexico
Amidst the rugged, sun-baked landscapes of northern Mexico, Portulaca johnstonii thrives as a resilient botanical survivor. This succulent is perfectly adapted to the harsh, arid environments of its native desert habitat.
First formally described by botanist J. Henrickson, the species belongs to the purslane family (Portulacaceae). Unlike some of its globally widespread and weedy relatives, this plant maintains a highly restricted geographical footprint, making it a subject of specialized botanical interest.
Taxonomy
- ∟ царство Plantae
- ∟ division Tracheophytes (Vascular Plants)
- ∟ subdivision Spermatophytes (Seed plants)
- ∟ Angiosperms
- ∟ mesangiosperms (Core angiosperms)
- ∟ eudicots
- ∟ core eudicots
- ∟ Superasterids
- ∟ order Caryophyllales
- ∟ подотряд / подпорядок Portulacineae
- ∟ family Portulacaceae (Purslane family)
- ∟ genus Portulaca (Purslane genus)
- ∟ species Portulaca johnstonii (Johnston's Purslane)
Morphology
As a typical representative of its genus, Portulaca johnstonii exhibits classic morphological adaptations for water resource conservation. Its vegetative structures are remarkably fleshy and thick, allowing efficient water storage to cope with long droughts in the Mexican desert.
The plant generally adopts a low or creeping growth habit, which helps minimize exposure to dry winds and extreme heat. This prostrate profile is a common and effective survival strategy in habitats with high insolation and very low rainfall.
Interesting facts
Although members of the purslane family are widespread globally, Portulaca johnstonii exhibits several distinct characteristics related to its distribution and taxonomy.
- Restricted Range: The species is native exclusively to Mexico, with documented populations specifically found in the states of Coahuila de Zaragoza and Sonora.
- Taxonomic Status: According to major botanical databases, there are no recognized subspecies, indicating a relatively uniform genetic population within its limited range.
- Botanical Authorship: The plant was meticulously studied and officially named by the botanist James Henrickson, adding to the extensive documentation of North American desert flora.
Geography of distribution
- Mexico
Sources
- Catalogue of Life
- Global Biodiversity Information Facility (GBIF)
- Plants of the World Online (POWO)
See also
Red-Stemmed Purslane
Portulaca rubricaulis
An annual succulent herb characterized by distinctive reddish stems and solitary yellow flowers, found across …
Round-Leaved Purslane
Portulaca rotundifolia
An annual succulent plant species of the Portulacaceae family, native to South America.
Hairy Hawaiian Purslane
Portulaca villosa
Portulaca villosa, commonly known as hairy purslane or 'ihi, is a rare, prostrate succulent endemic …