Angraecum pusillum

Names and Taxonomy

The accepted name for this orchid is Angraecum pusillum Lindl. The name was first published in Companion Bot. Mag. 2: 205 (1837) and is listed as an accepted species by Kew’s Plants of the World Online ^[1]. Several synonyms have been recorded, the most widely used being Angraecum burchellii Rchb.f. and the homotypic combination Angorkis pusilla (Lindl.) Kuntze, but these are treated as taxonomic synonyms rather than distinct taxa ^[1]. No common name is documented in the available sources.

How to Identify This Species

Angraecum pusillum is a very small epiphytic herb. The stem is short, often only up to 10 mm long, bearing a fan of 4–6 linear leaves 5.5–12 cm in length ^[2]. Leaves are grass‑like, dark‑greyish‑green, and arranged in a basal rosette. The plant produces several basal inflorescences 5–10 cm long; each inflorescence is erect to slightly curved and may bear up to 15 flowers ^[3]. Flowers are tiny, about 4 mm across, yellow‑green or white, and may be fragrant ^[2][4]. The lip is modestly trilobed and the spur is short, typical of the section Nana within the genus.

Because of its diminutive size, the species can be confused with other miniature Angraecum species such as A. sacciferum or A. chamaenthus. The key distinguishing features are the upright, multi‑flowered basal inflorescence (vs. usually few‑flowered horizontal spikes in A. sacciferum) and the habit of growing on the main trunk or as a lithophyte rather than strictly on twigs.

Native Range and Habitat

The species is native to southern Africa, recorded from eastern Zimbabwe, Eswatini, and the South African provinces of Cape, KwaZulu‑Natal and the former Northern Provinces ^[1][2]. It is an epiphytic (occasionally lithophytic) plant of shady, seasonally moist forest and scrub. Herbarium records and field observations place it at elevations of roughly 1,200–1,500 m above sea level, where temperatures are cool to moderate and humidity is relatively high ^[3]. The orchid is typically found on the trunks of trees or on rock outcrops within these forested habitats.

Species‑Specific Care

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Because A. pusillum is a miniature species, it tolerates only a limited amount of water on its leaves. Good air movement helps prevent fungal problems. Growers report that plants from the northern part of the range tend to be smaller than those from the southern populations, suggesting some plasticity in size with local climate ^[3].

Flowering and Pollination

Flowering has been reported throughout the year in cultivated plants, with no clear seasonal peak recorded in the sources consulted ^[4]. Individual flowers are short‑lived (a few days) and emit a faint fragrance, but no specific pollinator has been documented for this species. The short spur and modest nectar production are typical of moth‑pollinated Angraecum, yet direct observations are lacking.

Evidence and Limitations

The profile relies on a limited set of web‑based references. Detailed measurements of flower morphology, precise humidity and watering regimes, and pollinator observations are not available in the cited sources. Consequently, some cultivation recommendations are derived from the species’ natural habitat or from general epiphytic orchid practice and are marked as “Not documented.” Further field studies and horticultural trials would be required to refine temperature, humidity, and feeding schedules.