Leuenbergeria quisqueyana

Wapienne siedlisko

The species was described from around Bayahíbe on the southern coast of the Dominican Republic. Leuenberger documented plants on coral limestone. This specific natural-site substrate does not automatically define component proportions in a potting mix. POWO places the species in the seasonally dry tropical biome of the Dominican Republic. [Leuenberger 2008] [2-WWW]

Habit, spines and flower structure

The shrub usually reaches 2–4 m tall, exceptionally about 5 m. Leaves on short shoots are broad, elliptical to obovate, while those on vigorous growth may be distinctly elongated. Older trunk areoles produce large spine clusters, while some young flowering shoots may be almost unarmed. Spine number thus depends on the age and function of the stem part. [Leuenberger 1986, Pereskia quisqueyana description]

The 1986 monograph described pink male flowers 5–7 cm in diameter, with numerous stamens and a strongly reduced pistil. The author had not then documented the female part of the cycle. This describes the material available at the time, rather than a trait meaning the species produces no female plants. Coral limestone and sandy substrate close to sea level were recorded at coastal sites. [Leuenberger 1986, Pereskia quisqueyana description]

In the specimens described, roots formed elongated thickenings 20–30 cm long and 5–10 cm wide. In container cultivation, the presence of such organs supports carefully exposing the root ball during repotting and retaining the roots' connection to the stem base. This is a practical inference from structure, rather than a result of comparing pot types or root-pruning methods. [Leuenberger 1986, Pereskia quisqueyana description]

Roots and foliage

Roots form fleshy spindle-shaped thickenings. In Areces-Mallea's key, this trait, together with shrubby habit and elliptical to obovate leaves, helped distinguish the species from other Caribbean members. Later discovery of thickenings also in Leuenbergeria zinniiflora, however, limited the value of tuberous-root presence alone as a decisive trait. [Areces-Mallea 1992] [Leuenberger 2008]

Flowering and plant sex

Leuenbergeria quisqueyana is functionally dioecious. Its original description was based on a clone of male-flowered plants. This history shows why documenting flowering and specimen origin matters when interpreting collection material. Propagating one clone retains its traits, including sexual function, and does not itself create a population with diversity arising from sexual reproduction. [Leuenberger 2008] [Areces-Mallea 1992]