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Leaves opposite but sometimes appearing verticillate, linear to ovate; stipules with 3–5 short lobes from a short base.
Corolla tube filiform, enlarged at apex; throat hairy inside; lobes 5, ovate.
Subshrubs with many branches from a thick woody rootstock, often tufted.
Capsule ovoid, splitting into 2 cocci with numerous seeds.
Style included or exserted; stigma lobes filiform.
Ovary 2-locular with many ovules.
Stamens 5, included or exserted.
Testa finely striate.
