BIOL 1902 Study Guide - Heterostyly, Pontederia, Plant Reproductive Morphology
20 Jul 2012
School
Department
Course
Professor
Document Summary
Some nectar guides are invisible to us. How do plants avoid self-pollination: self-sterility or self-incompatability. Pink lady"s-slippers also employ a placement strategy: staminode, both exits are partially blocked by the staminode and sticky pollen masses. Spatial separation of sexes (a) separate sexes on the same plant (monoecious) Female flowers of conifers are usually near the top of the tree and the males at the bottom. So pollen from the male flowers does not fall on them (b) spatial separation of sexes on different plants (dioecious) White campions plants are either male or female: perfect flowers, temporal separation of sexes. Orange jewelweed flowers start off as males. The male part falls off and the flower becomes female (prevents self-pollination: temporal sex change = dichogamy, potrandry = male first. Pickerel-weed has another way of avoiding self-pollination. Flowers appear in different forms (stamens/style) heterostyly. Purple loosestrife also has three forms of flowers.
