=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.