A perennial plant lives and blooms for many years.

pinnatifid -- A leaf shape that is pinnately lobed but not cut all the way to the axis.

lobe -- A rounded parts of a leaf (or other organ).

ribbed -- having prominent, narrow parallel protrusions that extend over most of its length or circumference.

ray flowers -- The outer petals of a sunflower or daisy are ray flowers.

Involucre is the name given to the circle or spiral collection of bracts around a flower-cluster.

Glands are plant structures that secrete liquids, salts or other substances. Glands often appear as hairs with a drop of liquid at the end.

fruit -- any seed-bearing structure in flowering plants. It is formed from the ovary after flowering.

basal leaves -- a leaf that grows lowest on the stem of a plant.

glabrous -- smooth, glossy, having no bristles or hair-like structures. Bald.

achene -- a type of simple dry fruit produced by many species of flowering plants. For example, a rose hip holds a few achenes.