leaves as those of Grasses, which are

_Sheathing_, wrapped round the stem.

_Shield-shaped_, same as _scutate_, or as _peltate_, 53.

_Shrub_, _Shrubby_, 39.

_Sieve-cells_, 140.

_Sigmoid_, curved in two directions, like the letter S, or the Greek
_sigma_.

_Silicle_, a pouch, or short pod of the Cress Family, 123.

_Siliculose_, bearing a silicle, or a fruit resembling it.

_Silique_, capsule of the Cress Family, 123.

_Siliquose_, bearing siliques or pods which resemble siliques.

_Silky_, glossy with a coat of fine and soft, close-pressed, straight
hairs.

_Silver-grain_, the medullary rays of wood, 139.

_Silvery_, shining white or bluish-gray, usually from a silky
pubescence.

_Simple_, of one piece; opposed to _compound_.

_Sinistrorse_, turned to the left.

_Sinuate_, with margin alternately bowed inwards and outwards, 55.

_Sinus_, a recess or bay; the re-entering angle between two lobes or
projections.

_Sleep of Plants_ (so called), 151.

_Smooth_, properly speaking not rough, but often used for glabrous, i.
e. not pubescent.

_Soboliferous_, bearing shoots (_Soboles_) from near the ground.

_Solitary_, single; not associated with others.

_Sordid_, dull or dirty in hue.

_Sorediate_, bearing patches on the surface.

_Sorosis_, name of a multiple fruit, like a pine-apple.

_Sorus_, a fruit-dot of Ferns, 159.

_Spadiceous_, chestnut-colored. Also spadix-bearing.

_Spadix_, a fleshy spike of flowers, 75.

_Span_, the distance between the tip of the thumb and of little finger
outstretched, six or seven inches.

_Spathaceous_, resembling or furnished with a

_Spathe_, a bract which inwraps an inflorescence, 75.

_Spatulate_, or _Spathulate_, shaped like a spatula, 52.

_Species_, 175.

_Specific Names_, 179.

_Specimens_, 184.

_Spermaphore_, or _Spermophore_, one of the names of the placenta.

_Spermum_, Latin form of Greek word for seed; much used in composition.

_Spica_, Latin for spike; hence _Spicate_, in a spike, _Spiciform_, in
shape resembling a spike.

_Spike_, an inflorescence like a raceme, only the flowers are sessile,
74.

_Spikelet_, a small or a secondary spike; the inflorescence of Grasses.

_Spine_, 41, 64.

_Spindle-shaped_, tapering to each end, like a radish, 36.

_Spinescent_, tipped by or degenerating into a thorn.

_Spinose_, or _Spiniferous_, thorny.

_Spiral Vessels_ or _ducts_, 135.

_Spithameous_, span-high.

_Spora_, Greek