Glossary 



1123 



Parasitic. Growing upon and deriving 



nourishment from another plant. 

 Pectinate. Pinnatifid with narrow closely 



set segments; comblike. 

 Pedicel. The support of a single flower. 

 Peduncle. A primary flower stalk, support- 

 ing either a cluster or a single flower. 

 Peltate. Shield-shaped; a flat organ with :i 



stalk on its lower surface. 

 Perennial. Lasting year after year. 

 Perfect (flower). Having both stamens and 



pistil. 

 Perianth. The sepals and petals considered 



collectively. 

 Pericarp. The ripened wall of an ovary. 

 Perigynium. The structure inclosing the 



achene in the genus Carex. 

 Petal. One of the divisions of the corolla. 

 Petiole. The support of a leaf. 

 Phaenogamous. Having flowers with stam- 

 ens and pistils and producing seed. 

 P hyllopodic . With lower leaves of fertile 



culms normally blade-bearing, in the 



genus Carex. 

 Pilose. With long, soft hairs. 

 Pinna. A primary division of a pinnately 



compound leaf. 

 Pinnate. Having leaves divided into leaf- 

 lets or segments along a common axis. 

 Pinnatifid. Pinnately cleft to the middle or 



beyond. 

 Pistil. The seed-bearing organ of a flower, 



consisting of the ovary, stigma, and style 



when present. 

 Pistillate. With pistils, usually used to 



mean without stamens. 

 Plano-convex. Flat on one side and curved 



on the other. 

 Plumose. Resembling a plume or feather. 

 Pollen. The fecundating grains contained 



in the anther. 

 Polypetalous. Having separate petals. 

 Pome. A fleshy fruit of the apple type. 

 Procumbent. Trailing or lying on the 



ground, but without rooting at the nodes. 

 Prickle. A spiny outgrowth from the bark 



or rind of a plant. 

 Prostrate. Lying flat on the ground. 

 Puberulent. Minutely pubescent. 

 Pubescent. Provided with hairs. 

 Pulverulent. Powdered; appearing as if 



covered with minute grains of dust. 

 Punctate. Dotted with depressions or with 



translucent glands or colored dots. 

 Raceme. A simple inflorescence of pediceled 



flowers upon a common more or less 



elongated axis. 



Racemose. In racemes or resembling a 



raceme. 

 Rachilla. The axis of the spikelet in grasses. 

 Rachis. The axis of a compound leaf, spike, 



or raceme. 

 Ray. One of the branches of an umbel; the 



tlat marginal flowers in Composilae. 

 Receptacle. The termination of the flower 



stalk, bearing the floral organs. 

 Recurved,. Curved downward or backward. 

 Reflhxei. Pent backward abruptly. 

 Regular. Having the members of each part 



alike in size and shape. 

 Renifortn. Kidney-shaped. 

 Reticulate. In the form of a network. 

 Retrorse. Turned backward or downward. 

 Retiise. With a shallow notch at a rounded 



end. 

 Revolute. Rolled backward. 

 Rhizome. A prostrate or subterranean stem, 



usually rooting at the nodes and becoming 



erect at the apex. 

 Root. The underground part of a plant 



which supplies it with nourishment. 

 Rootstock. Same as rhizome. 

 Rugose. Wrinkled. 

 Rugulose. Somewhat wrinkled. 

 Sagittate. Shaped like an arrowhead with 



the basal lobes directed downward. 

 Samara. A simple, indehiscent, winged 



fruit. 

 Saprophyte. A plant that grows on dead 



organic matter. 

 Scabrous. Rough to the touch. 

 Scale. A minute, rudimentary or vestigial 



leaf. 

 Scape. A peduncle arising from the ground, 



naked or without proper foliage. 

 Scarious. Thin, dry, and translucent, not 



green. 

 Scorpioid {inflorescence). Coiled up in t la- 

 bud, unrolling in growth. 

 Secund. Borne along one side of an axis. 

 Seed. The ripened ovule (non-technical 



definition). Used in the plural sense for 



any number of ripened ovules of the same 



species. 

 Seeds. The plural form refers to a collect ion 



of seed of more than one species. 

 Sepal. One of the divisions of a calyx. 

 Septate. Provided with partitions. 

 Serrate. Having sharp teeth pointing for- 

 ward. 

 Serrulate. Finely serrate. 

 Sessile. Without a stalk. 

 Setaceous. Bristlelike. 

 Setose. Bristly. 



