Lophocereus
| Lophocereus | |
|---|---|
| File:Lophocereus schottii.jpg | |
| Kingdom | Plantae |
| Family | Cactaceae |
| Subfamily | Cactoideae |
| Tribe | Phyllocacteae |
| SubTribe | Echinocereinae |
| Genus | Lophocereus |
| Species | |
| Notes | Taxonomy follows Joël Lodé (2015). Lodé maintains Lophocereus as a distinct genus, separate from Pachycereus. |
Etymology
The name is derived from the Greek lophos (crest or mane) and the Latin cereus (wax candle), referring to the bristly, mane-like spines produced at the flowering apex of mature stems.
Description
Lophocereus consists of large, columnar cacti that often form massive, multi-stemmed clumps branching from the base.
- Stems: Erect, grey-green, with 5 to 15 prominent ribs. A unique characteristic of the genus is the dimorphism between vegetative (juvenile) and fertile (adult) stems.
- Pseudocephalium: Upon reaching maturity, the flowering parts of the stems develop a "bristly" appearance. The areoles in this zone produce long, grey, flexible, hair-like bristles instead of the short, stiff spines found on the lower parts of the plant.
- Flowers: Nocturnal, relatively small (2-4 cm), funnel-shaped, and usually pinkish-white or cream. They emerge in clusters of 1 to 5 from a single areole within the pseudocephalium.
- Fruits: Small, globose, and fleshy. They are bright red when ripe and usually contain a red pulp.
- Seeds: Small, black, and shiny.
Habitat
The genus is native to the Sonoran Desert, thriving in alluvial plains, rocky slopes, and desert washes. They are highly heat-tolerant and often form dominant stands in the landscape.
Distribution
- Mexico: Baja California, Baja California Sur, and Sonora.
- USA: Southern Arizona (Organ Pipe Cactus National Monument).
Species and Subspecies
Following the classification of Lodé (2015), the genus includes 3 recognized species and 2 subspecies:
- Lophocereus gatesii
- Lophocereus marginatus (The "Organ Pipe" often used for living fences)
- Lophocereus schottii (Type species)
Taxonomy
Joël Lodé (2015) maintains Lophocereus as a separate genus from Pachycereus. He bases this on its distinct pseudocephalium, different pollination syndromes (specialized moths), and molecular evidence that places it in a well-supported clade within the subtribe Echinocereinae.
