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=Perfoliate.= Clasping the stem so completely that the stem seems to pass through it. =Perianth.= The calyx and corolla of a flower. =Perigynium.= A sac-like structure surrounding the achene of a sedge. =Persistent.= Remaining attached for a considerable time. =Petal.= One member or segment of the corolla. =Petiole.= The stalk of a leaf. =Pinnate.= With several organs or structures attached at the sides of an axis or stalk; applied chiefly to the arrangement of the principal veins in a leaf and of leaflets in a compound leaf. =Pinnatifid.= Deeply pinnately cut or divided. =Pistil.= The central portion of a flower, consisting of ovary, style, and stigma; the seed-bearing part of the flower. =Pistillate.= Bearing pistils. =Polygamous.= Applied to plants in which some flowers are perfect and others either staminate or pistillate. =Pubescent.= Hairy. =Raceme.= A more or less elongated flower-cluster, bearing pedicelled flowers along a single axis. =Racemose.= Arranged in racemes. =Receptacle.= The end of a peduncle or pedicel upon which the organs of a flower, or the flowers of a head, are attached. =Recurved.= Curved back. =Reflexed.= Abruptly bent back or down. =Regular.= Uniform in shape or structure. Flowers are generally considered regular when all the petals are of the same size and shape. =Retrorse.= Directed backward or downward. =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-cluster. =Spat
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