=Revolute.= Rolled backward or under.

=Rootstock.= A horizontal subterranean stem, sending up leaves or stems.

=Rotate.= Wheel-shape; essentially flat and circular.

=Sac-like.= Inflated; sack-like.

=Sagittate.= Shaped like an arrow-head.

=Salver-form.= A corolla having a slender tube abruptly expanded at the summit into a flat or spreading portion.

=Scape.= A peduncle arising directly from the base of the plant, leafless or bearing bracts only.

=Segment.= One member or portion of an organ.

=Sepal.= One member or portion of the calyx.

=Serrate.= With sharp teeth at the margin.

=Serrulate.= Finely or minutely serrate.

=Sessile.= Without a stalk, petiole, or pedicel.

=Sheathing.= Inclosing.

=Simple.= In one piece; not compound; usually applied to leaves with a single blade.

=Sinuate.= Wavy-margined.

=Sinus.= The angle between two lobes or divisions.

=Spadix.= A short fleshy spike.

=Spathe.= A large bract or pair of bracts enclosing a flower-cl.u.s.ter.

=Spatulate.= Shaped like a spatula, with a narrow base and an enlarged, more or less rounded summit.

=Spike.= An elongated flower-cl.u.s.ter having sessile flowers upon an unbranched axis.

=Spike-like.= Resembling a spike.

=Spinulose-serrate.= Provided with teeth tipped with minute spines.

=Spur.= A hollow projection from the calyx or corolla, usually slender in shape, and generally directed backward.

=Stamen.= One of the organs of a flower, consisting of a filament and anther.

=Staminate.= Bearing stamens.

=Stolon.= A short stem arising from the base of a plant, prostrate or nearly so, and eventually taking root.

=Striate.= Marked with fine stripes or ridges.

=Style.= A portion of the pistil, usually slender, and connecting the ovary and stigma.

=Superior.= A superior ovary occupies the center of the flower and is not attached to any other floral organs.

=Subtending.= Situated at the base of an organ.

=Subulate.= Awl-shape.

=Ternately.= Divided by threes.

=Tomentose.= Densely hairy with matted or tangled hairs.

=Trifoliate.= With three leaflets.

=Truncate.= Cut straight across at the tip, or nearly so.

=Tube.= The more or less cylindrical portion of a gamosepalous calyx or a gamopetalous corolla, distinguished from the expanded or lobed terminal portion.

=Tubular.= Shaped like a tube.

=Twice-pinnate.= Same as bipinnate.

=Two-lipped.= A calyx or corolla in which the upper half is decidedly different in size or shape from the lower.

=Umbel.= A flower-cl.u.s.ter with several or many pedicelled flowers all arising from the same point.

=Undulate.= With a wavy margin.

=Viscid.= Sticky.

=Villous.= With long soft hairs.

=Whorl.= An arrangement of 3 or more leaves or flowers in a circle around a node.

=Whorled.= In a whorl.

=Wing.= A thin flat expansion on the sides or edge of an organ.