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Pictured is a milkweed flower showing pollination. The pollen coheres into a waxy mass. The pollen-masses are usually twin (as at b), and the handle or caudicle lies in a chink on the side of the stigma.

Milkweed Flower

Pictured is a milkweed flower showing pollination. The pollen coheres into a waxy mass. The pollen-masses…

A diagram of the various parts of pollen of orchid. po- Pollinia; c- Caudicle; vd- Viscid Disk; vg- Viscid Glove; r- Rostellum; lr- Lip of Rostellum.

Pollen of Orchid

A diagram of the various parts of pollen of orchid. po- Pollinia; c- Caudicle; vd- Viscid Disk; vg-…