Angraecum dives

Names and Taxonomy

The accepted name for this orchid is Angraecum dives Rolfe, first described in Flora of Tropical Africa 7:142 (1897)【1】. Kew’s Plants of the World Online lists the name as accepted and records its native range as Socotra, Kenya, Somalia and Tanzania【1】. No synonymy is recorded in the PlantaeDB entry, which explicitly states “No known synonyms”【4】. No common name appears in the cited sources, so none can be documented.

How to Identify This Species

Growth habit. A. dives is an epiphytic subshrub that typically reaches about 30 cm in height【5】. It may also grow lithophytically on coral or coastal rocks【8】.

Stem and leaves. The plant has a short, compact stem bearing 2–6 linear, leathery leaves. Leaves are arranged alternately along the stem and are relatively narrow, an adaptation to its dry‑tropical environment【8】.

Inflorescence. Flower spikes arise axially from the stem and range from 2.5 cm to 25 cm long, bearing 8–25 flowers per spike【8】. The flowering period in the wild is reported to be essentially year‑round, with blooms observed in all months【5】.

Flowers. Individual flowers are white, about 3 cm (1.2 in) across, and emit a noticeable fragrance, especially in the evening【5】【8】. The lip is modestly sized and the nectar spur is short, typical of many low‑elevation Angraecum species, but exact spur length is not documented in the available excerpts.

Diagnostic comparison. A. dives can be confused with other low‑elevation, white‑flowered Angraecum species such as A. brevicornu. However, the combination of a very short stem, a limited number of linear leaves, and a densely flowered, relatively short inflorescence helps separate it from the taller, more loosely branched A. brevicornu (which typically exceeds 50 cm in height).

Native Range and Habitat

The species occurs naturally on the island of Socotra and in coastal East African countries from southwestern Somalia through Kenya to Tanzania【1】【7】. It is primarily a lowland epiphyte, growing on the bark of trees such as Baobabs, as well as on coral outcrops and other rocky substrates near the sea. Elevation is recorded from sea level up to about 80 m【8】. The preferred biome is described as “seasonally dry tropical”, indicating a pronounced dry season with occasional heavy rains.

Species‑Specific Care

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Overall, detailed horticultural parameters (temperature ranges, light intensity, watering frequency, humidity levels) are not provided in the consulted literature. Growers should therefore treat A. dives as a typical low‑elevation Angraecum: provide bright, filtered light, moderate to high humidity, and a well‑aerated mounting medium, while monitoring the plant for signs of stress.

Flowering and Pollination

In the wild, A. dives flowers throughout the year, with individual blooms lasting long enough to be noted as “fragrant” especially during the evening hours【5】【8】. Flower size averages around 3 cm across. No specific pollinator has been documented for this species; the short spur suggests it may be visited by short‑tongued insects rather than the long‑tongued hawk moths associated with some other Angraecum species, but this remains speculative.

Evidence and Limitations

The profile relies on a limited set of online entries. Key horticultural details (temperature, light, watering, humidity) are absent from the cited sources, and the pollination biology of A. dives has not been published in the accessible literature. Future field studies and cultivation trials would be valuable to fill these gaps.