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Capsule cylindrical-ovoid to broadly ovoid, subterete or compressed; at rimes separating into 2 cocci at maturity.
Corolla tube slender, divided almost to the base forming a large, flattened or concave 4(5)-lobed limb.
Flowers sessile in short or elongate spikes, spikes usually dense, frequently paniculate, bracteate.
Stamens 4, didynamous, inserted on limb below lobes, filaments short, anthers oblong or linear.
Calyx spathaceous, entire or emarginate, membranous or hyaline, frequently binerved.
Bracts usually imbricate, exceeding calyx, lowest of ten leaf-like.
Annual or perennial herbs or undershrubs.
Ovary bilocular; style entire.
