| Five pistils were dissected from flowers and the stigmas and styles were mounted on aluminium stubs using carbon paste. |
| The total number of pistils, parthenocarpic and seed containing siliques, and the mean number of seeds per silique were recorded. |
| Males produce only staminate flowers with stamens and no vestigial pistils. |
| The upper lip, consisting of two fused petals, covers the pistils and stamens like a hood. |
| The number of pollen tubes and ovules in the ovaries of each of six dissected pistils from each cross is shown. |
| Natural selection disfavors mutations that cause pistils to accept pollen from genotypes that reject their pollen. |
