Angraecum ampullaceum

Angraecum ampullaceum Bosser is an accepted orchid species from Madagascar, treated in Kew Plants of the World Online within Orchidaceae and the genus Angraecum [1]. It is an epiphytic subshrub of wet tropical forest, reported from eastern central and southeastern Madagascar [1]. The available horticultural and descriptive sources are sparse, so this profile separates documented habitat and morphology from cultivation advice; where species-specific care is absent, it is marked Not documented rather than filled with generic Angraecum assumptions.

Names and Taxonomy

The accepted scientific name is Angraecum ampullaceum Bosser [1]. POWO gives the first publication as Adansonia, n.s., 10: 109 (1970) and accepts the species [1]. The same nomenclatural details appear in a French orchid compilation, which cites Bosser in Adansonia 2, 10(1): 109 (1970) [2].

POWO lists two homotypic synonyms: Arachnangraecum ampullaceum (Bosser) Szlach., Mytnik & Grochocka, published in Biodivers. Res. Conservation 29: 11 (2013), and Jumellea humbertii H.Perrier, published in Notul. Syst. (Paris) 7: 60 (1938) [1]. The Limodore page also lists Jumellea humberti [2], a spelling variant of Jumellea humbertii; it should not be treated as a separate species. IOSPE places the species in section Arachnangraecum and repeats the same synonymy [3]. No common name is adequately documented in the supplied sources; IOSPE gives an English phrase, but it is presented as a common-name meaning rather than a verified vernacular name [3].

Name status is therefore accepted under POWO, with the two synonyms above treated as homotypic rather than as separate accepted species [1]. No infraspecific taxa are documented in the supplied sources.

How to Identify This Species

POWO describes A. ampullaceum as an epiphytic subshrub [1]. IOSPE describes it as a medium-sized epiphyte with numerous leaves and an axillary inflorescence [3]. Limodore reports an epiphytic plant up to 60 cm tall, with one to three white flowers [2]. These plant-size and flower-count figures come from compiled descriptions, not from a specimen examination for this profile, and should be checked against verified material.

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The long spur, reported at 110–130 mm, is one of the most distinctive measurements in the available description [2]. The lip is described as bent and triangular, and the sepals as lanceolate [2]. IOSPE notes a 9–10 cm axillary inflorescence bearing one or two flowers and white flowers [3]. Because the sources disagree on flower count (1–2 versus 1–3), neither count should be treated as absolute. Photographs can suggest identity, but a label or image alone cannot confirm a species without checking the flower structure, spur, and provenance.

No fragrance description was found in the supplied sources. No documented look-alike comparison was supplied; Jumellea humbertii is a synonym, not a separate species to compare.

Native Range and Habitat

POWO gives the native range as eastern central and southeastern Madagascar [1]. IOSPE specifies humid evergreen forest at elevations of 500 to 1,400 m [3]. Limodore gives an altitude of 700 to 1,400 m [2]. The two elevation ranges overlap but do not agree at the lower limit; this profile reports both rather than averaging them. The habitat is described as humid evergreen forest by IOSPE [3], and POWO places the species in the wet tropical biome [1].

The species is documented as epiphytic [1][3]. No host-tree specificity, rainfall seasonality, or microhabitat data were found in the supplied sources. Occurrence in cultivation is not evidence of natural distribution, and no introduced or naturalized records are documented here.

Species-Specific Care

Species-specific cultivation evidence for A. ampullaceum is limited. The available sources give habitat and a broad temperature description but no tested watering schedule, light level, humidity target, potting mix, or seasonal rest regime. The table below therefore separates the few supported statements from facts that are Not documented. Habitat elevation is not a cultivation setpoint.

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The only cultivation-adjacent statement that can be used cautiously is IOSPE’s description of the species as warm to cool growing [3]. That does not define a minimum or maximum temperature, and it should not be converted into a guessed greenhouse range. The reported native elevation of 500–1,400 m [3] or 700–1,400 m [2] is habitat context only. A grower without local trial data should avoid imposing a rigid watering or resting schedule and should observe how the plant responds in the actual growing environment. Because no species-specific light, humidity, or medium data were found, those factors remain Not documented.

Flowering and Pollination

IOSPE reports flowering in later spring and again in late summer on an axillary inflorescence 9 to 10 cm long, bearing one to two white flowers [3]. That source does not state the hemisphere or whether the timing refers to cultivation or wild populations, so the seasons cannot be converted into reliable calendar months for a particular location. Limodore reports one to three white flowers and a spur of 110–130 mm [2]. The flower count therefore differs between sources (1–2 versus 1–3); both are reported here as source-specific observations rather than reconciled into a single number.

The same Limodore entry gives lanceolate dorsal and lateral sepals at 38–40 × 6–7 mm, a bent triangular lip, and the long spur [2]. Flower longevity and fragrance timing are Not documented in the supplied sources. The long spur is a morphological feature, but it is not by itself proof of a particular pollinator. No species-specific pollinator observation was found for A. ampullaceum; pollinator identity remains Not documented here. General accounts of long-spurred Angraecum pollination should not be applied to this species without a direct record.

Conservation and Responsible Cultivation

No formal conservation assessment for A. ampullaceum was supplied in the available evidence. POWO provides accepted-name and distribution data [1], but this profile does not assign an IUCN Red List category or any legal trade status from memory. Habitat loss or collection pressure may be concerns for Madagascan orchids generally, but a species-specific formal assessment was Not documented in the supplied sources. Responsible cultivation advice should therefore be limited to traceable provenance and compliance with applicable laws; no nursery purchase is assumed to be legal or sustainably sourced without evidence.

Evidence and Limitations

This profile relies on a Kew POWO search snippet [1], a Limodore page excerpt [2], and an IOSPE search snippet [3]. These are not full taxonomic revisions, and no herbarium specimen, original 1970 description, or complete flora treatment was examined for this draft. The care table is deliberately sparse because the supplied sources do not provide species-specific cultivation trials. The lower elevation limit differs between sources (500 m in IOSPE versus 700 m in Limodore), and flower count differs (1–2 versus 1–3). Plant size, sepal dimensions, and spur length come from the Limodore compilation and should be verified against additional specimens or authoritative descriptions. No formal conservation status, fragrance data, or species-specific pollinator record was found. This draft has not been botanically reviewed and should not be treated as a verified publication-ready account.