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However, insects sometimes gather pollen from staminate anemophilous flowers at times when higher-protein pollens from entomophilous flowers are scarce. Anemophilous pollens may also be inadvertently captured by bees' electrostatic field. This may explain why, though bees are not observed to visit ragweed flowers, its pollen is often found in ...
A catkin or ament is a slim, cylindrical flower cluster (a spike), with inconspicuous or no petals, usually wind-pollinated (anemophilous) but sometimes insect-pollinated (as in Salix). It contains many, usually unisexual flowers, arranged closely along a central stem that is often drooping.
Flowers pollinated by bees and wasps vary in shape, colour and size. Yellow or blue plants are often visited, and flowers may have ultra-violet nectar guides, that help the insect to find the nectary. Some flowers, like sage or pea, have lower lips that will only open when sufficiently heavy insects, such as bees, land on them.
So moth-pollinated flowers tend to be white, night-opening, large and showy with tubular corollas and a strong, sweet scent produced in the evening, night or early morning. Much nectar is produced to fuel the high metabolic rates needed to power their flight. Other moths (Noctuids, Geometrids, Pyralids, for example) fly slowly and settle on the ...
Osmanthus fragrans (lit. ' fragrant osmanthus '), variously known as sweet osmanthus, sweet olive, tea olive, and fragrant olive, is a flowering plant species native to Asia from the Himalayas through the provinces of Guizhou, Sichuan and Yunnan in China, Taiwan, southern Japan and Southeast Asia as far south as Cambodia and Thailand.
Flowers are pale yellow, tubular, and clustered in spherical bent-down heads (capitula), which are in turn clustered in leafy and branched panicles. Flowering occurs from early summer to early autumn; pollination is anemophilous. The fruit is a small achene. Seed dispersal occurs by gravity. [5]
Pollen itself is not the male gamete. [4] It is a gametophyte, something that could be considered an entire organism, which then produces the male gamete.Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell.
These flowers can grow up to 40 cm (16 in) in diameter and 3.5 pounds ( 1.6 kilograms) in weight., [13] exceeded in mass only by members of the genus Rafflesia. All of the flowers of one particular plant will, on a given evening, all be in the female phase or all in the male phase, so that pollination must be by a different individual ...