GLOSSARY OF SPECIAL TERMS. 



VOL. I. 



Odsphere. The cell of the archegone which is 



fertilized by spermatozoids. 

 Operculate. With an operculum. 

 Operculum. A lid. 

 Orbicular. Approximately circular in outline. 



Orthotropous. Term applied to the straight 

 ovule, having the hilum at one end and the 

 micropyle at the other. 



Ovary. The ovule-bearing part of the pistil. 



Ovate. In outline like a longitudinal section of 

 a hen's egg. 



Ovoid. Shaped like a hen's egg. 



Ovule. The macrosporange of flowering plants, 

 becoming the seed on maturing. 



Palate. The projection from the lower lip of 

 two-lipped personate corollas. 



Palet. A bract-like organ enclosing or subtend- 

 ing the flower in grasses. 



Palmate. Diverging radiately like the fingers. 



Pandurate ; Panduriform. Fiddle-shaped. 



Panicle. A compound flower cluster of the 

 racemose type, or cluster of sporanges. 



Paniculate. Borne in panicles or resembling a 

 panicle. 



Papilionaceous. Term applied to the irregular 

 flower of the Pea Family. 



Papillose. With minute blunt projections. 



Pappus. The bristles, awns, teeth, etc., sur- 

 mounting the achene in the Chicory and 

 Thistle Families. 



Parasitic. Growing upon other plants and ab- 

 sorbing their juices. 



Parietal. Borne along the wall of the ovary, or 

 pertaining to it. 



Parted. Deeply cleft. 



Pectinate. Comb-like. 



Pedicel. The stalk of a flower in a flower- 

 cluster, or of a sporange. 



Peduncle. Stalk of a flower, or a flower-cluster, 

 or a sporocarp. 



Pedunculate. With a peduncle. 



Peltate. Shield-shaped ; a flat organ with a 

 stalk on its lower surface. 



Penicillate. With a tuft of hairs or hair-like 

 branches. 



Perfect. Flowers with both stamens and pistils. 



Perfoliate. Leaves so clasping the stem as to 

 appear as if pierced by it. 



Perianth. The modified floral leaves (sepals or 

 petals), regarded collectively. 



Pericarp. The wall of the fruit, or seed-vessel. 



Perigynium. The utricle enclosing the ovary or 

 achene in the genus Carex. 



Perigynous. Borne on the perianth, around the 

 ovary. 



Peripheral. Pertaining to the periphery. 



Persistent. Organs remaining attached to those 

 bearing them after the growing period. 



Petal. One of the leaves of the corolla. 



Petaloid. Similar to petals ; petal-like. 



Petiolate. With a petiole. 



Petiole. The stalk of the leaf. 



Phyllode. A bladeless petiole or rachis. 



Phyllopodic. In Carex, with lower leaves of 

 the fertile culms normally blade-bearing. 



Pilose. With long soft hairs. 



Pinna. A primary division of a pinnately com- 

 pound leaf. 



Pinnate. Leaves divided into leaflets or seg- 

 ments along a common axis. 



Pinnatifid. Pinnately cleft to the middle or 

 beyond. 



Pinnule. A division of a pinna. 



Pistil. The central organ of a flower containing 

 the macrosporanges (ovules). 



Pistillate. With pistils ; and usually employed 

 in the sense of without stamens. 



Placenta. An ovule-bearing surface. 



Plicate. Folded into plaits, like a fan. 



Plumose. Resembling a plume or feather. 



Plumule. The rudimentary terminal bud of the 

 embryo. 



Pollen. Pollen-grain. Contents of the anther. 



See Microspore. 

 Pollinia. The pollen-masses of the Orchid and 



Milkweed Families. 



Polygamous. Bearing both perfect and imper- 

 fect flowers. 



Polypetalous. With separate petals. 

 Pome. The fleshy fruit of the Apple Family. 

 Procumbent. Trailing or lying on the ground. 

 Prophylla. Bractlets. 

 Prothallium. The sexual generation of Pteri- 



dophyta. 



Puberulent. With very short hairs. 

 Pubescent. With hairs. 

 Punctate. With translucent dots or pits. 

 Pungent. With a sharp stiff tip. 

 Pyriform. Pear-shaped. 



Raceme. An elongated determinate flower- 

 cluster with each flower pedicelled. 

 Racemose. In racemes, or resembling a raceme. 

 Rachilla. The axis of the spikelet in grasses. 

 Rachis. The axis of a compound leaf, or of a 



spike or raceme. 

 Radiant. With the marginal flowers enlarged 



and ray-like. 



Radiate. With ray-flowers ; radiating. 

 Radicle. The rudimentary stem of the embryo ; 



hypocotyl. 



Radicular. Pertaining to the radicle or hypo- 

 cotyl. 



Raphe (Rhaphe). The ridge connecting the hi- 

 lum and chalaza of an anatropous or amphi- 

 tropous ovule ; the ridge on the sporocarp of 

 Marsilea. 



Ray. One of the peduncles or branches of an um- 

 bel ; the flat marginal flowers in Compositae. 

 Receptacle. The end of the flower stalk, bear- 

 ing the floral organs, or, in Compositae, the 

 flowers ; also, in some ferns, an axis bearing 

 sporanges. 



Virgate. Wand-like. 

 Recurved. Curved backward. 

 Reflexed. Bent backward abruptly. 

 Regular. Having the members of each part alike 



in size and shape. 

 Reniform. Kidney-shaped. 

 Repand. With a somewhat wavy margin. 

 Reticulate. Arranged as a network. 

 Retrorse. Turned backward or downward. 

 Refuse. With a shallow notch at the end. 

 Revolute. Rolled backward. 

 Rhachis. See Rachis. 

 Rhizome. See Rootstock. 

 Ringent. The gaping mouth of a two-lipped 



corolla. 



Rootstock. A subterranean stem, or part of one. 

 Rostellum. Beak of the style in Orchids. 

 Rostrate. With a beak. 

 Rosulate. Like a rosette. 

 Rotate. With a flat round corolla-limb. 

 Rugose. Wrinkled. 

 Runcinate. Sharply pinnatifid, or incised, the 



lobes or segments turned backward. 

 Sac. A pouch, especially the cavities of anthers. 

 Saccate. With a pouch or sac. 

 Sagittate. Like an arrow-head, with the lobes 



turned downward. 



Samara. A simple indehiscent winged fruit. 

 Saprophyte. A plant which grows on dead 



organic matter. 

 Scabrous. Rough. 



Scale. A minute, rudimentary or vestigial leaf. 

 Scape. A leafless or nearly leafless stem or pe- 

 duncle, arising from a subterranean part of a 

 plant, bearing a flower or flower-cluster. 

 Scapose. Having scapes, or resembling a scape. 

 Scarious. Thin, dry, and translucent, not green. 

 Scorpioid. Coiled up in the bud, unrolling in 



growth. 



Secund. Borne along one side of an axis. 

 Segment. A division of a leaf or fruit. 

 Sepal. One of the leaves of a calyx. 



