Sculptural Rarity: Euphorbia erigavensis

An architectural treasure from the Horn of Africa, this species offers a robust, geometric aesthetic ideal for the serious succulent collector.

1. Origin & History of Name The specific epithet erigavensis is a geographical toponym referencing the Erigavo (now Ceerigaabo) region in the Sanaag province of Somalia. It was formally described by British botanist Susan Carter Holmes in 1992 within the Nordic Journal of Botany, distinguishing it as a unique species within the diverse Somali flora.

2. Morphology This species manifests as a densely branching, succulent shrublet, forming compact, cushion-like mounds. The stems feature distinct costae (ribs)—typically 5 to 7—armed with solitary or paired spines emerging from horny spine shields. The plant produces small, yellow-green cyathia (inflorescences characteristic of Euphorbiaceae) near the apex, contrasting sharply against the deep green to glaucous epidermis.

3. Habitat & Origin Euphorbia erigavensis is a wild species native to the limestone slopes and Juniperus forest zones of Northern Somalia. Due to the ecological sensitivity of its native range, ethical sourcing is paramount; all commercially available specimens should be nursery-propagated via seeds or cuttings to ensure sustainability and preservation of wild populations.

4. Cultivation Profile

• Substrate: strictly requires a porous, mineral-heavy mix. Use 70% inorganic material (pumice, perlite, or river grit) and 30% cactus compost to prevent root rot.
• Light: Thrives in bright, indirect sunlight to full sun. In the Indian context, provide filtered shade during the intense midday heat of May and June to prevent epidermal scorching.
• Water/Dormancy: Follow the "soak and dry" method during the growing season. Strictly withhold water during the winter dormancy and protect from humidity during the monsoon season to avoid fungal infections.

5. Scientific/Historical Anecdote The genus Euphorbia is named after Euphorbus, the Greek physician to King Juba II of Numidia (circa 50 BC – 23 AD), who allegedly used the potent, toxic latex found in these plants for medicinal purposes. This latex is a convergent evolutionary trait shared with unrelated plants like milkweeds, serving as a powerful chemical defense against herbivores.