Angraecum spectabile

Names and Taxonomy

The accepted scientific name is Angraecum spectabile Summerh. According to Kew’s Plants of the World Online the name is accepted and was first published in Kew Bulletin 13:274 (1958) [1]. The International Plant Names Index records the same original publication details [2]. A later homotypic synonym is Eichlerangraecum spectabile (Summerh.) Szlach., Mytnik & Grochocka, published in 2013 [1]. No common name is documented in the consulted sources.

How to Identify This Species

Angraecum spectabile is a small epiphytic (occasionally lithophytic) subshrub, typically reaching about 30 cm in height [5]. The stem is slightly compressed and bears distichous leaves that are 7–10 cm long, 2.1–3 cm wide, elliptic, unequally bilobed, and twisted at the base; leaf‑sheaths are 2–2.2 cm long [3]. Roots are fine, about 2.5 mm in diameter.

The inflorescence is solitary, up to 10 cm long, with a peduncle 2.8–3.2 cm long and small ovate bracts 5–6 mm long. Each flower is green‑white, fragrant, and relatively large for a mainland Angraecum; the lip is broadly obovate to obcordate, 3.2–3.4 cm long and 4.2–4.4 cm wide, with a 2.5 mm apicule [3]. Petals are lanceolate, 4–4.3 cm long, 0.6 cm wide. The nectar spur is funnel‑shaped at the base, geniculate in the middle, cylindrical, about 0.9–1.1 cm wide and notably long (exact length not given in the excerpt) [3]. The flower’s size places it among the largest of mainland species, second only to A. infundibulare [4].

A close look‑alike is Angraecum eichlerianum, which shares a similar habit but has narrower leaves and a shorter spur; A. spectabile can be distinguished by its broader leaves, wider labellum, and a markedly longer spur [4]. However, definitive identification should be confirmed with a herbarium specimen or a reliable photograph.

Native Range and Habitat

The species is endemic to north‑western Tanzania, specifically the Bukoba District, as recorded by Kew [1]. It occurs in a seasonally dry tropical biome, growing as an epiphyte on tree branches and occasionally as a lithophyte on rocks. Field observations place it at elevations of roughly 1,100–1,200 m above sea level [4]. The climate at these altitudes is relatively cool and experiences a marked dry season.

Species‑Specific Care

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Because the species originates from a cool, high‑elevation forest, growers should aim for a stable, moderate temperature regime and ensure excellent air movement to reduce fungal risk. Mounting on bark or a rock slab reproduces its natural lithophytic habit and helps keep the roots dry between waterings. Regular, light feeding during the active growth phase (spring–summer) supports healthy flowering.

Flowering and Pollination

In the wild, flowering has been reported in late spring and early summer [4]. The plant produces a single fragrant green‑white flower per inflorescence; the scent is noted but not described in detail. The long, geniculate spur suggests moth pollination, a common syndrome in the Angraecum alliance, but no specific pollinator has been documented for A. spectabile.

Conservation and Responsible Cultivation

Formal conservation assessments (e.g., IUCN Red List) are not cited in the available sources; therefore the threat status is Not documented. Given its restricted range in north‑western Tanzania, growers are encouraged to source plants from reputable, legally compliant nurseries and to support in‑situ conservation where possible.

Evidence and Limitations

Key morphological measurements and habitat data come from the World Flora Online entry and the IOSPE species page. Temperature preference is inferred from the description “cool‑growing” and the recorded elevation; precise optimal temperature ranges, humidity values, and watering schedules are not documented for this species. Pollination biology remains unstudied beyond morphological inference. Further field studies and cultivation trials would help fill these gaps.