At a glance
RECORDED PROFILE DATA- Scientific name
- Angraecum rhizanthium H.Perrier
- Name status
- Accepted
- Native region
- Northern Madagascar
- Growth habit
- Epiphytic subshrub
- Cultivation temperature group
- Not documented
Names and Taxonomy
Angraecum rhizanthium H.Perrier is the accepted name for this species according to Kew’s Plants of the World Online.[1] The name was first published in Notulae Systematicae (Paris) 14:163 (1951). A later homotypic synonym is Gomphocentrum rhizanthium (H.Perrier) Szlach., Mytnik & Grochocka, published in 2013.[1]
How to Identify This Species
The plant is an epiphytic subshrub that typically attains a height of about 30 cm.[4] Leaves are arranged along a short, woody stem; detailed leaf morphology is not documented in the available sources. The inflorescence bears one or a few white, fragrant flowers. Flower size, spur length, and other diagnostic floral measurements have not been published in the consulted references, so identification should be confirmed by comparison with herbarium specimens or expert opinion.
Native Range and Habitat
Angraecum rhizanthium is native to the northern region of Madagascar, occurring in wet tropical forest biomes.[1] It grows as an epiphyte on tree branches, favouring humid, shaded microhabitats. Elevational range and precise host tree preferences are not recorded in the cited data.
Species-Specific Care
| Factor | Documented guidance | Evidence |
|---|---|---|
| Growth habit | Epiphytic; can be mounted on bark or grown in a coarse, well‑draining orchid mix. | Inferred from native habit; not explicitly described in cultivation sources. |
| Light | Not documented – recommend bright, indirect light typical for many Angraecum species. | — |
| Water | Not documented – keep medium moist but not water‑logged, mirroring rainforest conditions. | — |
| Humidity | Not documented – aim for high humidity (≥70 %) as the species originates from a wet tropical biome. | — |
| Temperature | Not documented – warm to intermediate temperatures are generally suitable for low‑land Madagascan Angraecum. | — |
| Feeding | Not documented – a balanced orchid fertilizer at half strength during active growth is a common practice. | — |
| Seasonal changes | Not documented – no specific rest period reported. | — |
Because detailed horticultural data for A. rhizanthium are lacking, growers are advised to start with the general care guidelines used for other epiphytic Angraecum species and adjust based on the plant’s response.
Flowering and Pollination
The flowers are white and emit a fragrance, as noted in a general plant description.[4] No published observations of pollinators or precise flowering time are available for this species; therefore, pollination ecology remains undocumented.
Evidence and Limitations
This profile is based on two primary online references. Morphological details (leaf shape, flower dimensions, spur length), precise elevation range, and specific horticultural protocols are not documented in the sources consulted. Further field studies or specialist orchid literature would be needed to fill these gaps.
Frequently asked questions
Is Angraecum rhizanthium considered endangered?
A formal conservation assessment for this species is not provided in the cited sources; its status is therefore Not documented.
Can Angraecum rhizanthium be grown mounted on bark?
The species is epiphytic in its native habitat, so mounting is a reasonable approach, but specific mounting recommendations are not documented for this species.
FOLLOW THE EVIDENCE
Sources & references
- Angraecum rhizanthium H.Perrier | Plants of the World Online | Kew Science, https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:616374-1
- Angraecum rhizanthium (Angraecum rhizanthium) | NativePlants.info, https://www.nativeplants.info/plant/magnoliophyta-flowering-plants/orchidaceae/angraecum/angraecum_rhizanthium.html
