Covered with prickles or spines.

The range of environmental conditions a species can tolerate.

The study of relationships between organisms and their environment.

Without ribs or midveins.

Prefix meaning outer or external.

A type of vascular arrangement where phloem occurs only external to the xylem in a tubular configuration.

Relating to or influenced by soil conditions.

The regrowth of grass after mowing or grazing; aftermath.

Sickle-shaped; curved like a scythe.

A quick-release organic fertilizer high in nitrogen.