The midvein of a pinna or pinnule in ferns.

The seed leaf; the first leaf or pair of leaves produced by a germinating seed.

A crop grown primarily to protect and improve the soil between periods of regular crop production.

A bowl-shaped depression, especially at the apex of some fruits or in volcanic soils.

Soil that moves slowly downhill due to gravity, often causing leaning trees.

A plant that grows horizontally along the ground or other surfaces, rooting at intervals.

Having rounded teeth along the margin (leaf edges).

To make firm or solid (in soil science); or to combine (in taxonomy).

Belonging to the same species.

Prominent pore-like structures on stems or fruits for gas exchange.