Photo: Paul venter, CC BY-SA 4.0 (via Wikimedia Commons)

Poison Rope

Strophanthus speciosus

Also known as Corky-Bark Poison-Rope, Gifklimop (Afrikaans)

At a glance

Family

Apocynaceae (dogbane family, subfamily Periplocoideae)

Type

Woody scrambling shrub or liana

Parts used

None for internal use; historically the seeds and stem sap were prepared as arrow poison, never as food or medicine

Size

Sprawling shrub to climbing vine, roughly 2 to 6 meters where it finds support

Bloom

Cream to golden-yellow flowers with dramatic long, twisted tails, appearing in spring and early summer

Habitat

Coastal forest margins, riverine thicket, and bushveld across the Eastern Cape and KwaZulu-Natal of South Africa

Acquisition

Grow

This plant in HerbSense

Key benefits

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Dramatic ribbon-tailed blooms

Draws moths and pollinators

Vigorous ornamental climber

Historic arrow-poison source

Traditional uses

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Strophanthus speciosus belongs to a genus long known across southern and central Africa for one purpose above all others, arming hunting arrows. Communities in the plant's native range traditionally scraped and boiled the seeds and stem sap into a thick paste applied to arrow tips, a preparation potent enough to bring down large game through its effect on the heart. It was this same family of compounds, cardiac glycosides, that later drew the attention of Western pharmacology, which studied related Strophanthus species to understand how such plant poisons acted on the human heart. Within its own ecosystem, though, the plant's more visible legacy is horticultural, its twisting, streamer-like flowers have long made it a striking, if little-known, addition to gardens that can accommodate its toxicity safely.

How to grow & use it

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Choose it when

“For a garden that wants breathtaking, twisted blooms and a story about survival, not a remedy for the medicine cabinet.”

Did you know?

The genus name Strophanthus comes from the Greek strophos, meaning twisted cord, and anthos, meaning flower, a direct nod to the long, ribbon-like corolla lobes that spiral out from each bloom like tiny streamers caught in the wind.

Safety

Every part of Strophanthus speciosus, especially the seeds and the milky sap, contains potent cardiac glycosides (cardenolides) closely related to those in foxglove and oleander. Southern African hunters traditionally smeared crushed seeds and stem sap onto arrow tips precisely because these compounds are strong enough to stop a heart. Ingesting any part of this plant can cause dangerous arrhythmias, nausea, and potentially fatal cardiac collapse, and there is no traditional dose that is considered safe for eating or brewing. Sap can also irritate skin and eyes on contact, so gloves are wise when pruning or handling seed pods. Keep it well away from children, pets, and livestock, never attempt a home tea, tincture, or poultice from this species, and if you suspect any exposure or ingestion, treat it as a medical emergency and seek help from a qualified professional or poison control immediately.