Abstract
Cleistogamy in Salpiglossis sinuata L. (Solanaceae) involves a series of developmental events that includes germination of pollen tetrads en masse inside the anther, penetration of pollen tubes through the anther wall toward the stigma which is in contact with the anther, growth of pollen tubes down the style, and, finally, fertilization. This occurs within 6 days from the first appearance of the flower as compared to 10–12 days for normal anthesis of chasmogamous flowers. Coincident with these events in cleistogamous flowers are lack of corolla development and reduced size of androecium and gynoecium.
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