Glossary
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Paired
Occurring in two's, e.g. two spikelets per node.

Palea
The adaxial bract of a floret; two-veined, arising from the floral axis.

Panicle
An inflorescence type in which the central axis branches and rebranches.

Papilla
A minute nipple-shaped projection.

Papillose
Having minute nipple-shaped projections on the surface.

Pectinate
An arrangement of parts resembling the teeth of a comb (e.g., the spikelets on Bouteloua hirsuta).

Pedicel
The stalk of a spikelet, except for spikelets on a spike inflorescence.

Pedicellate
Having a pedicel or stalk.

Peduncle
The stalk or stem of an inflorescence.

Pendulous
Drooping, hanging downward, suspended.

Perennial
Growing more than 2 years; completing several reproductive cycles.

Perfect
Flowers having both stamen and pistils (carpels).

Pericarp
The ripened ovary wall after it becomes a fruit.

Persistent
Remaining attached, either after other parts have been shed or for a considerable period.

Petiole
Stalk of a leaf blade.

Pilose
Long, soft hairs that are typically straight.

Phytomere
The basic unit of structure of the grass shoot, an internode together with the leaf and portion of the node at the upper end and a bud and portion of the node at the lower end.

Pinnate
Having two rows of lateral divisions along the main axis.

Pistil
Seed producing structure of a flower with ovary, style and stigma.

Pistillate
Applied to spikelets bearing female parts only and to an inflorescence or a plant with female flowers.

Pithy
Spongy; e.g., culm of Saccharum.

Pitted (pit)
Marked with small depressions or pits.

Plano-convex
Flat on one side and convex on the other.

Playa
A dried up lake basin.

Plumbeous
Lead-colored.

Plumose
Feathery in appearance, having fine hairs on each side.

Polyploid
Having the two or more times the basic chromosomal complement.

Primary Branch
Any branch arising from the main axis; all branches that come from the central axis of a grass inflorescence.

Primary Unilateral Branch
Any branch that originates from the central or main axis of a panicle inflorescence with spikelets along one side or what appears to be one side.

Prophyll
First leaf of a lateral branch; a sheath with 2 veins.

Prostrate
Lying flat on the ground.

Puberulent
Minutely pubescent.

Pubescent
Covered with short, soft hairs.

Pulvini
A swelling at the base of a leaf or a branch of the inflorescence.

Punctate
Covered with glandular dots, pits, or depressions.

Pungent
A sharp point; an acrid taste.

Pyramidal
Triangular in outline; shaped like a pyramid.