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Spigelia anthelmia L.; ta ka ban

Herb; leaves opposite, clustered towards the stem apex, simple, ovate-elliptic, base cuneate, margin entire, apex acute; inflorescence a terminal cluster of one-sided spikes; corolla pale purple to white; fruit a 2-lobed capsule covered with minute tubercles.

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Spigelia pygmaea is very similar, but, as its name implies, only about half the size (or less) of Spigelia anthelmia.