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Sand orchid
Eulophia speciosa
SA tree number
English: Sand orchid, Dune Orchid, Showy Eulophia, Large Yellow Eulophia, Yellow Ground Orchid, Harlequin Orchid
Afrikaans: Geelgrondorgidee
Zulu: Umabelejongosi Ompofu, Umlunge Omhlophe
Historical scientific names: Lissochilus speciosus, Eulophia austrooccidentalis, Eulophia leucantha, Eulophia wakefieldii
Eulophia speciosa, commonly known as the Sand Orchid or Yellow Ground Orchid, is a widespread and striking indigenous terrestrial orchid found across a vast area of Southern and tropical Africa. Highly valued for its showy, bright yellow flowers, often marked with red on the lip, these orchids emerge on tall, leafless spikes from underground pseudobulbs. Though common in the wild, its beauty makes it a desirable and rewarding plant for cultivation in suitable garden conditions.
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Distinguishing features
A robust terrestrial orchid growing from underground corms/pseudobulbs.
Produces tall, leafless flowering stalks (racemes) bearing numerous, large, bright yellow flowers.
Flowers often have red markings on the lip of the side lobes, giving them a "harlequin" appearance.
Leaves are fleshy, lance-shaped, and semi-erect, typically developing after or with the flowers.
Flowers are deceptive, offering no nectar reward to pollinators.
Overall appearance:
Eulophia speciosa typically forms colonies of upright plants. The most prominent feature is the tall, slender flower spike adorned with numerous bright yellow blossoms, creating a dramatic vertical accent. The leaves are basal, fleshy, and often appear somewhat later than the flowers.
Height:
The flowering stem typically reaches 0.4 to 0.8 metres tall, but can sometimes extend up to 1.5 metres.
Width:
Forms clumps of up to 50 plants, spreading horizontally through the growth of new pseudobulbs, creating a patch up to 0.5 - 1 meter wide. Individual plants are relatively narrow.
Leaves:
Fleshy, lanceolate (lance-shaped), and semi-erect.
Usually 3 to 6 leaves per plant, measuring 15-65 cm long.
They arise from the underground pseudobulbs and are often fully developed around or after the flowering period.
Flowers:
Large and showy, measuring about 25–45 mm in diameter.
Bright yellow, with red markings or lines on the lip (labellum) and side lobes.
Borne in a lax, unbranched raceme (flower spike) with 10 to 30 flowers per stalk.
Flowers are resupinate (inverted) and are nectarless, mimicking nectar-rich flowers to attract pollinators.
The plant is hermaphroditic (flowers contain both male and female parts).
Flowering season:
Flowers mainly in summer, typically from October to February, but peak flowering is often from October to January in Southern Africa.
Fruits:
Develop into dry, dehiscent capsules (pods) after successful pollination.
These capsules split open when ripe to release numerous tiny dust-like seeds.
Seeds:
Extremely small, dust-like, and require symbiotic fungi (mycorrhiza) for germination in nature. Propagation from seed is complex and usually done in sterile laboratory conditions.
Stems:
The main "stem" is the leafless flowering scape (stalk) that emerges from the underground pseudobulb.
Roots:
Fibrous roots emerge from the pseudobulbs, anchoring the plant and absorbing nutrients. It is reliant on mycorrhizal fungi for nutrient uptake.
Corms:
Eulophia speciosa grows from underground corms/pseudobulbs, which are thickened, fleshy, bulb-like stems that store water and nutrients. These can be subterranean or partly exposed.
Soil type:
Highly adaptable, found in sandy soils, clay soils, and rocky areas. Prefers well-drained, humus-rich soil when cultivated.
Aspect:
Thrives in full sun to partial shade. Forms from inland locations are more frost-tolerant than coastal forms. It can tolerate some drought once established.
Edibility:
The pseudobulbs are reported to be edible and are a favoured food of local people in some parts of its native range, often eaten raw or mashed and mixed with other foods.
Toxicity:
While the pseudobulbs are eaten in some regions, some sources mention that root infusions are prepared as emetics (to induce vomiting) for both humans and animals in traditional medicine. This suggests caution should be exercised, and consumption without proper knowledge is not recommended. All indigenous orchids are protected by law in South Africa.
Uses:
Ornamental: Highly prized in horticulture for its spectacular, bright yellow flower display, making it an excellent pot plant or addition to a suitable garden bed.
Traditional Medicine: Rhizomes/bulbs are used in traditional African medicine, including as an emetic and as a protective charm against storms.
Cultural: Its bulbs are consumed as food in certain areas.
Wildlife Garden: While not offering nectar, its showy flowers attract large carpenter bees, which are important pollinators.
Container Plant: Suitable for growing in pots due to its pseudobulbous nature.
Ecology:
Pollination: The flowers are deceptive, offering no nectar or other reward. They are pollinated by large carpenter bees (Xylocopa species) that explore the flowers while instinctively searching for food sources.
Mole rats are known to eat the corms/pseudobulbs often causing the plant to die.
Habitat: Found in a wide variety of habitats, including grasslands, bushveld, wooded grasslands, and marshy coastal grasslands. It grows in colonies.
Mycorrhizal Symbiosis: Like most orchids, it relies on a symbiotic relationship with mycorrhizal fungi in the soil for nutrient uptake.
Distribution and habitat:
Eulophia speciosa has a very wide distribution range across Southern, Central, and Eastern Africa, extending northwards into Yemen and Saudi Arabia.
South African Provinces: Eastern Cape, Free State, KwaZulu-Natal, Limpopo, Mpumalanga, North West, Western Cape.
Habitat: Found from near sea level (often exposed to salt spray) up to 2000 m altitude. It typically grows in grasslands, bushveld, and wooded areas, often in sandy or clay soils. Coastal forms may be less frost-tolerant.
Derivation of name:
The genus name Eulophia is derived from the Greek words 'eu' meaning "well" or "true" and 'lophos' meaning "crest" or "tuft," referring to the crested or ridged lip (labellum) of the flowers in many species.
The species epithet speciosa is Latin for "beautiful," "handsome," or "showy," aptly describing its striking flowers.
Common names like "Large Yellow Eulophia" directly refer to its prominent yellow flowers and size.
Historical aspects:
Eulophia speciosa has a long history of use in traditional African medicine and as a food source in various regions. Its widespread distribution and adaptability likely contributed to its recognition and use by indigenous communities. In horticulture, it is increasingly being appreciated as a beautiful and resilient ornamental orchid.
Interesting facts
This orchid lives up to its name "speciosa" (Latin for "showy") with its tall spikes of vibrant yellow flowers – it's a real garden showstopper!
It plays a clever trick on its pollinators: its dazzling flowers offer no nectar, but large carpenter bees still visit, fooled into searching for a reward!
While some orchids are notoriously difficult, the Large Yellow Eulophia is comparatively easy to grow, making it a great choice for budding orchid enthusiasts!
Growing tips
Propagation: Best propagated by division of mature pseudobulbs during the dormant season (winter). Propagation from seed is very difficult due to their microscopic nature and reliance on mycorrhizal fungi.
Planting: Can be grown in pots or directly in garden beds in suitable climates. Use a loose, well-drained growing medium, such as a mix of leaf mould, bark pieces, river sand, and garden loam. It can be beneficial to include a small quantity of soil from where the plant was previously growing to maintain mycorrhizal associations.
Depth: Plant pseudobulbs about 2-3 cm deep.
Watering: Keep plants fairly dry during the dormant period (when no growth occurs) to prevent rot, especially for inland forms. Regular watering should only commence once new shoots appear in spring/summer. Avoid overwatering.
Feeding: Feed with a liquid fertiliser during the active growing season.
Sunlight: Prefers full sun to partial shade.
Frost: While adaptable, coastal forms may be sensitive to severe frost. Protect young plants from heavy frost.
Protection: All indigenous orchids are protected by law in South Africa; ensure you only acquire nursery-grown plants from reputable sources.
This plant is a fantastic alternative for:
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