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Flower of nasturtium cut through the middle to show the spur (s) and the nectar (n).

Cross-section flower

Flower of nasturtium cut through the middle to show the spur (s) and the nectar (n).

Nectar gland in the ovary of day lily.

Nectar Gland

Nectar gland in the ovary of day lily.

A group of humming birds with particularly long and narrow beaks, well-adapted for sipping nectar from flowers.

Hummingbirds

A group of humming birds with particularly long and narrow beaks, well-adapted for sipping nectar from…

A group of humming birds, two of which are vying for a flower's nectar.

Hummingbirds

A group of humming birds, two of which are vying for a flower's nectar.

Pictured are nectar cells magnified 1000 diameters. The nectariferous nucleus is also pictured.

Nectar Cells

Pictured are nectar cells magnified 1000 diameters. The nectariferous nucleus is also pictured.

Section through a petal of buttercup (Ranunculus), showing nectar gland (n). Note bundle of conducting tissues.

Petal

Section through a petal of buttercup (Ranunculus), showing nectar gland (n). Note bundle of conducting…

"Raspberry (Rubus idaeus, order Rosaceae), being fertilized. A, Flower. p, p, Petals. a, a, Anthers. s, Stigma. no, Nectary openings. nc, Nectar Cells. D, Drupels." — The Encyclopedia Britannica, 1910

Raspberry Fertilization

"Raspberry (Rubus idaeus, order Rosaceae), being fertilized. A, Flower. p, p, Petals. a, a, Anthers.…

"Toad-flax (Linaria vulgaris). Flowers being visited by an insect for nectar. B, longitudinal section, showing the insect's proboscis extended down the spur toward the nectar-gland; C, insect with a mass of pollen (p), rubbed off from anthers onto the dorsal hairs of the thorax, during successive visits." -Gager, 1916

Common Toadflax with Insect

"Toad-flax (Linaria vulgaris). Flowers being visited by an insect for nectar. B, longitudinal section,…