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Chiefly stemless herbs, with regular 4-merous spiked flowers, the stamens inserted on the tube of the dry and membranaceous veinless monopetalous corolla, alternate with its lobes;—chiefly represented by the two following genera.

Woody plants, monopetalous, didynamous or diandrous, with the ovary commonly 2-celled by the meeting of the two parietal placentæ or of a projection from them, many-ovuled; fruit a dry capsule, the large flat winged seeds with a flat embryo and no albumen, the broad and leaf-like cotyledons notched at both ends.—Calyx 2-lipped, 5-cleft, or entire.

Corolla monopetalous, rarely polypetalous, hypogynous.—Shrubs or small trees.

Herbs with acrid milky juice, alternate leaves, and scattered flowers, an irregular monopetalous 5-lobed corolla, the 5 stamens free from the corolla, and united into a tube commonly by their filaments and always by their anthers.—Calyx-tube adherent to the many-seeded pod.

This plant has no calyx; the corolla is monopetalous, and of the colour of the brightest gold, which produces a splendid appearance when in bloom.