Part 86

PISTIL. The inner part or whorl of a complete flower, 10

PISTILLATE. Applied to a flower when it has a pistil and no stamens, 12

PLACENTA. The part of the ovary to which the ovules are attached, 10

POD. See LEGUME.

POLLEN. The cellular dust discharged by the anthers, 9, 25

POLLINATION. The transfer of pollen from anther to stigma, 26

RACEME. An inflorescence in which the flowers are stalked along a common axis, 8

RADICAL. Growing direct from a point near the summit of the root, 4

RAY. The outer, spreading florets of a composite flower, 175

RECEPTACLE. The enlarged upper part of a flower-stalk that gives attachment to the parts of the flower.

SAGITTATE. Arrow-shaped, 7

SAMARA. A winged fruit, 13

SEPAL. A part of the outer whorl (calyx) of a complete flower, 9

SERRATE. Sawlike, 6

SESSILE. Without a stalk, 5, 6

SILICULA. A fruit resembling a siliqua, but shorter and broader, 12

SILIQUA. A pod-like fruit with two valves that separate from a central membrane to which the seeds are attached, 12

SOLITARY. Arranged singly, 8

SPATHULATE. Spoon-shaped, 7

SPIKE. An inflorescence in which the flowers are sessile along a common axis, 8

STAMENS. The flower organs that produce the pollen, 9

STAMINATE. Applied to a flower that has stamens but no pistil, 12

STIGMA. The part of the pistil which receives the pollen, 10

STIPULATE. Having stipules, 4

STIPULES. Scaly or leafy organs at the base of a leaf, 4

STOMATA. The openings in the epidermis of plants, 318

STYLE. The stalk that supports the stigma, 10

SUPERIOR. Above. Applied to the calyx when it is on the ovary, and to the ovary when it is free from the calyx or perianth, 10