Order 80. Iridaceae. - Herbaceous plants; with rhizome or corm; leaves equitant, ensiform, etc.; flowers 2-sexual, regular; perianth tubular, 6-partite, petaloid, in 2 rows as a rule; stamens 3, epigynous; anthers extrorse; ovary 3-locular; ovules numerous; placentae axile; stigmas 3, sometimes petaloid; fruit a capsule.

Order 81. Amaryllidaceae. - Herbaceous plants, bulbous; leaves narrow; flowers regular, bisexual; perianth superior, 6-partite, petaloid; stamens 6, distinct on base of perianth-tube; with corona sometimes; anthers introrse; ovary globose, 3-celled; ovules many; placentae axile; fruit a capsule, 3-valved.

Order 82. Dioscoreaceae. - Herbaceous plant, twining; plant dioecious, leaves alternate, net-veined; flowers unisexual, in axillary racemes; perianth petaloid, superior, 6-partite; stamens 6, on perianth-segments; anthers introrse; ovary inferior, 3-celled; styles 3; fruit a berry; seeds few.