Subfam Aizooideae

Inflorescence leafy; perianth internally petaloid, externally sepaloid; flower perigynous or very rarely hypogynous; capsule loculicidal or septicidal, often hygrochastic; x = 8. Six genera, mainly in S Africa and Australia, in E Africa and the Mediterranean, introduced worldwide into suitable climates, mainly as weeds in arid country.

Key to the Genera of Subfamily Aizooideae.

1. Fruit a purely septicidal or septicidal/loculicidal hygrochastic capsule 1. Gunniopsis

- Fruit a purely loculicidal hygrochastic or xerochastic capsule, often opening tardily 2

  1. Septum incomplete, 2 locules with a single basal ovule each
  2. Acrosanthes

- Septa complete, locules more than 2, if 2, ovules pendulous 3

3. Capsule 5-10-locular, with 2 to many ovules in each locule; distinct expanding keels present 4

- Capsule 2-5-locular with a single pendulous ovule in each locule; expanding tissue rudimentary to absent 5

4. Capsules depressed at apex, if not, valves with prominent rims 3.Aizoon

- Capsules convex at apex, ± rounded 2. Aizoanthemum

5. Stamens as many as perianth lobes 4. Plinthus

- Stamens twice the number of perianth lobes, in pairs alternating with perianth lobes 5. Galenia

Inflorescence sometimes distinct from the well-developed vegetative base; flowers 4-merous; perianth rarely free, white, pink, or yellow inside. Fruit 4-locu-lar, a septicidal or septicidal/loculicidal hygrochastic capsule with long marginal septal expanding keels. Seeds ovoid to round, papillate. Fourteen spp., W, S, and C Australia.

2. Aizoanthemum Dinter ex Friedrich

Aizoanthemum Dinter ex Friedrich, Mitt. Bot. Staatssamml.

München 2: 342 (1957). Aizoon L. subg. Aizoanthemum (Dinter ex Friedrich) Adam-son (1959).

Annual herbs. Leaves alternate, densely papillose. Inflorescence rich; flowers perigynous; numerous stamens with flat bases. Fruits 5-10-locular, with a ± rounded top, opening completely hygrochastically by long expanding keels reaching from the centre of the fruit to the tip of the valve. Seeds reniform, with concentric ridges, light to dark brown. Four spp., N Namibia and S Angola.

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