Jasminocereus
| Jasminocereus | |
|---|---|
| File:Jasminocereus thouarsii.jpg | |
| Kingdom | Plantae |
| Family | Cactaceae |
| Subfamily | Cactoideae |
| Tribe | Phyllocacteae |
| SubTribe | Corryocactinae |
| Genus | Jasminocereus |
| Species | |
| Notes | Taxonomy follows Joël Lodé (2015). A unique genus endemic to the Galápagos Islands. |
Etymology
The name is derived from the genus Jasminum (Jasmine) and the Latin cereus (wax candle), referring to the intense, jasmine-like fragrance of its nocturnal flowers.
Description
Jasminocereus consists of large, tree-like cacti that can reach up to 7 meters in height, forming a distinct woody trunk.
- Stems: Erect and heavily branched. The segments are cylindrical, often showing growth rings or constrictions. The epidermis is typically olive-green to brownish.
- Ribs: Numerous (usually 11 to 22), relatively low and rounded.
- Spines: Variable in number and length, ranging from needle-like to bristly, often becoming very dense on older segments.
- Flowers: Nocturnal and highly fragrant. They are narrowly funnel-shaped, with a long, slender floral tube. Colors vary from greenish-white to chocolate-brown or purplish on the exterior.
- Fruits: Large, ovoid to globose berries, greenish to reddish-purple, and relatively smooth. They are acidic but edible.
- Seeds: Small, black, and pitted.
Habitat
The genus is found on arid, volcanic lowlands and coastal areas. It often grows in lava fields among other endemic Galápagos vegetation. Altitudinal range: 0–300 m.
Distribution
- Ecuador: Endemic to the Galápagos Islands (found on San Cristóbal, Santa Cruz, Floreana, Isabela, and Fernandina).
Species and Subspecies
Following the classification of Lodé (2015), the genus is monotypic but includes three distinct subspecies:
- Jasminocereus thouarsii (Type species)
Taxonomy
Molecular studies indicate that Jasminocereus is closely related to the South American mainland genus Brachycereus, also endemic to the Galápagos. Lodé maintains it in the subtribe Corryocactinae due to its floral and seed morphology, representing an ancient colonization of the islands from the mainland.
