Mexican Purslane
Portulaca mexicana
Portulaca mexicana is a low-growing succulent plant native to numerous states across Mexico. First described …
Round-leaved purslane (Portulaca teretifolia)
Roundleaf Purslane
roundleaf purslane
Silhouette: T. Michael Keesey
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Portulaca teretifolia (Roundleaf Purslane): Species Overview
Recognized globally by the common name roundleaf purslane, Portulaca teretifolia exhibits a unique cylindrical leaf structure that sets it apart from other members of the Portulacaceae family. The eminent botanist Carl Sigismund Kunth formally described this distinctive succulent species, noting its highly specialized foliage adapted for water conservation.
The botanical name directly references its most notable feature, as the specific epithet teretifolia translates to having terete or tapering leaves. The species includes recognized infraspecific taxa such as Portulaca teretifolia subsp. cubensis, indicating a primary distribution centered around the Caribbean region.
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 teretifolia (Round-leaved purslane)
Morphology
The defining morphological trait of Portulaca teretifolia is its highly specialized leaf structure. Notable anatomical characteristics include:
- Terete foliage that is circular in cross-section rather than flat.
- Reduced epidermal surface area, which significantly minimizes moisture loss through transpiration.
- Vibrant, cup-shaped flowers that emerge at the tips of the fleshy stems.
This cylindrical leaf shape represents an incredible evolutionary adaptation for surviving in sun-drenched, arid microclimates.
Interesting facts
The presence of distinct subspecies like Portulaca teretifolia subsp. cubensis highlights the evolutionary divergence and island endemism common in Caribbean flora. The terete leaves of this species demonstrate a remarkable convergent evolution seen in other arid-adapted plant families across the globe.
Geography of distribution
- Cuba
Sources
- Plants of the World Online (POWO)
- Global Biodiversity Information Facility (GBIF)
- Tropicos
See also
Red-Stemmed Purslane
Portulaca rubricaulis
An annual succulent herb characterized by distinctive reddish stems and solitary yellow flowers, found across …
Extremely Hairy Purslane
Portulaca hirsutissima
A succulent plant endemic to Brazil, characterized by its prominent hairy morphological traits and described …
Giulietti's Purslane
Portulaca giuliettiae
A rare succulent plant species in the purslane family, naturally endemic to the Bahia region …