Glossary
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Saccate
Swollen or sac-shaped; see the second glume of Sacciolepis.

Scabrous
Rough to the touch; caused by short, stiff, angled hairs on the surface.

Scarious
Thin, dry, and membranous; not green (e.g., the margins of a Poa lemma).

Second glume
The uppermost of the two glumes; an odd-veined, empty bract of the spikelet.

Secondary
Not primary, subordinate; the branches that arise from the primary branches.

Series
Number or group of similar objects arranged in a row.

Serrate
Saw-toothed with the teeth angled toward the apex, sharp teeth.

Sessile
Without a pedicel or stalk.

Setaceous
Slender and bristle-like.

Setae
A rigid bristle; sharp pointed bristle.

Sheath
The lower part of a leaf that encloses the culm; typically open or split and overlapping at the margins.

Sinuate
Having a wavy margin.

Solitary
Single; one.

Spathe
A modified leaf sheath that subtends and often encloses some of the inflorescence.

Spatheate
Having a spathe.

Species
The scientific name of a plant; the genus name and the specific epithet together; also equal to the latin name or binomial

Spherical
Shaped like a globe or a ball.

Spicate
Spike-like; resembling a spike inflorescence but having both sessile and pedicellate spikelets or flowers.

Spicate raceme
An inflorescence type with a rachis bearing some combination of sessile and/or pedicellate spikelets at each node.

Spike
An unbranched inflorescence in which the spikelets are sessile on the rachis (main axis).

Spikelet
The basic unit of a grass inflorescence, usually consisting of two glumes , one or more florets on a short axis, the rachilla.

Spines
A sharp pointed, stiff body arising from the epidermis; in grasses these are usually flattened and modified inflorescence branches.

Spiral
An arrangement of objects along the outline of a coiled spring.

Spreading
Branches that are widely ascending to divergent from the main axis.

Squarrose
Spreading rigidly at right angle; usually the shape of bracts.

Stamen
The male organ of a flower, consisting of the pollen bearing anther on a slender filament. The collective term for stamen is androecium.

Staminate
Containing stamen but not the pistil.

Sterile
Without pistils. A sterile floret may be staminate or neuter. Not capable of producing a seed.

Stigma
The part of the ovary or style that receives the pollen for fertilization.

Stipe
A stalk beneath the spikelets and bristles of the genus Pennisetum

Stolon
A horizontal, above-ground stem with modified leaves, nodes, internodes, and axillary buds.

Stoloniferous
Bearing horizontal above ground stems that root at the nodes.

Striate
Marked with longitudinal grooves or lines; appearing striped.

Sub
A prefix used to denote a lesser degree, an inferior rank, or a lower position.

Subequal
Nearly equal in length.

Subtend
To be below and close to; refers to position.

Subterranean
Below ground or below the soil.

Subulate
Awl-shaped.

Succulent
Fleshy, soft or juicy.

Systematics
The broad field concerned with the study of the diversity of plants and their identification, naming, classification, and evolution.