Siliculose

bearing silicles.

Silique

Siliqua,an elongated,dry, bi-valvular, pod-like 'fruit, with a transverse internal membrane.

Siliquose

bearing siliqua.

Silky

having very long and fine hairs, with a glossy appearance like silk.

Simple

the opposite of compound; without subordinate parts.

Sinuate

Sinuated, having alternate, rounded, rather large lobes and sinuses at the margin.

Sinus

the re-entering angle or depression between two projections or prominences.

Solitary

not closely associated with another object of the same description.

Spadix

the axis of a spiked, often fleshy inflorescence among monocotyledons, when the flowers are densely aggregated, usually accompanied by one or more spathes.

Spadiceous

of or belonging to a spadix.

Spathaceous

furnished with, or having the general appearance of a spathe.

Spathe

a foliaceous or membranaceous involucre, of one or few sheathing bracts, more or less enveloping the flowers in certain monocotyledons.

Spathulate

more or less rounded towards the summit and narrowed towards the base.

Spike

an inflorescence similar to the raceme, only that the flowers have no pedicels; also, those forms in which spikelets are arranged in close and alternating series upon a common rachis, as in some grasses.

Spikelet

a small spike, of which several, aggregated round a common axis, constitute a compound spike; more especially applied to the spiked arrangements of two or more flowers of grasses, which are variously disposed round a common axis.

Spine

a stiff, sharp-pointed process, containing some portions of woody tissue, degenerated branch, leaf, stipule, etc.

Spinous

bearing or covered with spines.

Spongy

having the cellular tissue copious, forming a sponge-like mass.

Spreading

having a gradual outward tendency, or bending from an axis.

Spur

a tubular expansion of some part of a flower.

Spurred

having a spur.

Stamen

that organ of the flower which contains the pollen.

Staminate

bearing stamens; usually applied to unisexual flowers.

Standard

the dorsal petal in a papilionaceous flower.

Stellate

disposed in a radiating manner round a centre.

Stigma

that portion of a pistil, generally its summit, by which the fertilizing influence of the pollen is conveyed to the ovules.

Stigmatic

of or belonging to the stigma.

Sting

a sharp, somewhat stiff hair, seated on a gland which secretes an acrid fluid.

Stipule

a foliaceous appendage, various in character, produced on each side the base of certain petioles.

Striated

marked with streaks or little furrows.