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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).

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic or beautiful forms (galls) that grow on leaves and stems.

Gall

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic…

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic or beautiful forms (galls) that grow on leaves and stems.

Gall

Galls on leaf of rose. The location of a parasite is often marked by swellings of peculiar and fantastic…

Galls on stem of grape. The location of a parasite is often marked by swellings of peculiar and fantastic or beautiful forms (galls) that grow on leaves and stems.

Gall

Galls on stem of grape. The location of a parasite is often marked by swellings of peculiar and fantastic…

Gland(g) from the upper surface of the leaf of lilac: e, epidermis, c, cuticle, p, palisade cells.

Gland

Gland(g) from the upper surface of the leaf of lilac: e, epidermis, c, cuticle, p, palisade cells.

Nectar gland in the ovary of day lily.

Nectar Gland

Nectar gland in the ovary of day lily.

Leaf of Mimosa in open position.

Mimosa

Leaf of Mimosa in open position.

Leaf of Mimosa in closed position.

Mimosa

Leaf of Mimosa in closed position.

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…

Plant of Phaseolus grown in darkness.

Phaseolus

Plant of Phaseolus grown in darkness.

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher, filled with water, and covered with a lid. This design helps it to trap unsuspecting insects that are then digested.

Pitcher Plant

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher,…

Cross section of stem of Myriophyllum, with air canals.

Cross-section Stem

Cross section of stem of Myriophyllum, with air canals.

Cross-section of stem of Ricinus communis, showing ring of secondary xylem.

Cross-section Stem

Cross-section of stem of Ricinus communis, showing ring of secondary xylem.

Leaf of sundew with half of the tentacles inflexed from stimulation.

Sundew

Leaf of sundew with half of the tentacles inflexed from stimulation.

Young vascular bundle: p, primary phloem; x, primary xylem; c, first divisions of cambium cells.

Vascular Bundle

Young vascular bundle: p, primary phloem; x, primary xylem; c, first divisions of cambium cells.

A rosette of leaves of Venus's flytrap seen from above.

Venus Flytrap

A rosette of leaves of Venus's flytrap seen from above.

Outer portion of a cross-section of a wheat grain; h, various integuments of the ovary and seed, forming the husk; a, cells of "aleurone layer" of endosperm, loaded with protein grains; b, starch-bearing cells.

Wheat Grain

Outer portion of a cross-section of a wheat grain; h, various integuments of the ovary and seed, forming…

Ending of a xylem strand among the cells of the mesophyll in a leaf of lilac; t, tracheid; i, intercellular space.

Xylem

Ending of a xylem strand among the cells of the mesophyll in a leaf of lilac; t, tracheid; i, intercellular…

Longitudinal section (diagrammatic) of a young xylem strand; c, cambium; y, young trachea,; p, pitted trachea; s, spiral trachea; a, annular trachea; m, pith.

Xylem

Longitudinal section (diagrammatic) of a young xylem strand; c, cambium; y, young trachea,; p, pitted…