A class of plant hormones regulating growth and development, particularly IAA (indole-3-acetic acid).

Growth pattern where the main axis terminates in a flower (contrasts with monopodial).

Growth response where cell elongation is controlled by auxin concentration.

The degree to which soil nutrients are accessible for plant uptake.

Soil nutrients in forms that can be absorbed by plant roots.

Narrow and sharply pointed, like an awl (describing leaves or other structures).

A slender, bristle-like appendage, especially on grass spikelets or seeds.

The upper angle between a leaf/stem and the stem/branch from which it grows.

Relating to or situated in the axis (central line) of a structure.

Located in or arising from an axil (e.g., axillary buds or flowers).