Section A. Structure and Specialized Characters:
I. The Plant

A. Plant Parts

Bud. Immature vegetative or floral shoot or both, often covered by scales.

Flower. Reproductive structure of flowering plants with or without protective envelopes, the calyx and/or corolla; short shoot with sporophylls and with or without sterile protective leaves, the calyx and corolla.

Fruit. Matured ovary of flowering plants, with or without accessory Parts.

Leaf. A photosynthetic and transpiring organ, usually developed from leaf primordium in the bud; an expanded, usually green, organ borne on the stem of a plant.

Root. An absorbing and anchoring organ, usually initially developed from the radicle and growing downward.

Seed. Matured ovule of seed plants.

Stem. A supporting and conducting organ usually developed initially from the epicotyl and growing upward.

B. Plant Types
(Classification based on habit)

Herb. A usually low, soft, or coarse plant with annual aboveground stems.

Shrub. A much-branched woody perennial plant usually without a single trunk.

Tree. A tall, woody perennial plant usually with a single trunk.

Vine or Liana. An elongate, weak-stemmed, often climbing annual or perennial plant, with herbaceous or woody texture.