Phenology Walk – Black Mampoo

Black Mampoo (Guapira fragrans)

Family: Nyctaginaceae
Origin: Native to the Caribbean, Central America, and parts of northern South America
Garden location: 17° 42′ 59.72″ N, 64° 49′ 49.71″ W (Back 9)
ArbNet Level II list: Yes
POWO Status: Tree
IUCN Red List threat level: Least Concern

What to watch for (Phenology)

Leaves

  • Leaf flush: Periodic through the year, often following rainfall
  • Leaf drop: Minimal; evergreen to semi-evergreen under St. Croix conditions
  • Notes: Leaves are leathery, slightly rough in texture, and tolerant of heat and drought

Flowers

  • Buds: Small and inconspicuous, forming in clusters at leaf axils
  • First bloom: Often late spring into summer
  • Peak bloom: Early to mid-wet season
  • End of bloom: Gradual taper rather than a sharp cutoff
  • Pollinators observed: Small insects; flowers are subtle but fragrant

Fruit / seed

  • Fruit set: After flowering
  • Ripening: Summer into fall
  • Dispersal: Birds; small fleshy fruits attractive to wildlife

Weather sensitivity

  • Rain-triggered? Yes — new growth and flowering often increase after rainfall
  • Drought response: Good tolerance once established
  • Other notes: Performs well in dry forest and coastal woodland settings

Why this plant matters

Guapira fragrans is a quiet but ecologically important native tree — not showy, but steady. Its subtle flowers, wildlife-supporting fruit, and resilience in dry coastal forests make it a strong indicator of Caribbean lowland ecology. Phenologically, it rewards patient observation: rather than dramatic seasonal shifts, it expresses time through gradual cycles of growth, flowering, and fruiting.

Cultural and historical significance

Cultural uses

  • Traditional uses: Wood used locally for small construction and fuel
  • Ecological value: Provides food for birds and other fauna
  • Ornamental potential: Sometimes planted as a hardy, low-maintenance native tree

St. Croix / Caribbean notes

  • Native to St. Croix and part of dry forest and secondary woodland communities
  • Likely present in pre-colonial landscapes as well as post-estate regeneration
  • Represents the less celebrated but foundational layer of Caribbean native flora
  • Valuable for restoration and re-native planting in degraded areas

My observations

  • First observed in project: (date)
  • Notable moments:
    • (YYYY-MM-DD) — Subtle flowering noted during phenology walk
    • (YYYY-MM-DD) — Fruit ripening coinciding with increased bird activity
  • Questions / uncertainties:
    • Variability of flowering intensity year to year
    • Degree of dependence on rainfall versus day length

Photos

  • Whole tree / habit
  • Leaves (showing texture and venation)
  • Flowers (buds and open — best captured close)
  • Fruit (immature and ripe)
  • Bark and branching
  • Repeated phenology images from the same vantage point over time

Medicinal Uses

In traditional medicine, Guapira fragrans (also known as black mampoo, Caribbean rosewood, or Caribbean laurel) has a variety of uses, primarily in the Caribbean region where it is native. 

Traditional uses include:

  • Fever reduction.
  • Relief from headaches.
  • Treatment of stomach problems or pains. 

It is important to note that these are traditional folk medicine practices, and the fruit of the Guapira fragrans should not be consumed. Scientific studies on the plant’s efficacy and safety are limited. 

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