A substance or factor that initiates or increases the activity of a biological process, such as enzyme activity in plants.

Having sharp or prickly points, such as spines or thorns.

A pointed or sharp tip of a plant structure, such as a leaf or shoot.

A leaf shape characterized by a long, slender point at the tip.

A sharp or pointed feature, such as a leaf apex or angle.

Referring to the side of an organ that is closest to the axis or stem, often the upper surface of…

Describing a process or effect that is produced by adding one or more elements together.

Describing a condition where the stamens of a flower are united in one group, often seen in some plant species.

An organophosphate insecticide used to control pests on plants.

Needle-shaped; slender and pointed like a pine needle.