GLOSSARY. 



821 



Nodose, having swollen nodes or articulations. 



Nodulose, applied to roots with thickened 

 knots at intervals. 



Nosology, vegetable, the study of the diseases 

 of plants. 



Notorhize.^, radicle on the back of the coty- 

 ledons, as in some Cruciferse. 



Nucleus, the body which gives origin to new 

 cells ; also applied to the central cellular por- 

 tion of the ovule and seed. 



NucuLANiuM, applied to the fruit of the Med- 

 lar having nucules ; some also apply jhis 

 term to the Grape. 



Nucule, hard carpel in the Medlar, also one 

 of the parts of fructification in Characeee. 



Nucumentaceous, Cruciferas having a dry 

 monospermal fruit. 



Nut, property appHed to the glans, but also 

 appUed to any hard nut-like fruit, as in Carex 

 and Rumex. 



Ob, in composition, means reversed or con- 

 trariwise. 



Obcompressed, flattened in front and behind, 

 not laterally. 



Obcordate, inversely heart-shaped, with the 

 divisions of the heart at the opposite end from 

 the stalk. 



Oblong, about f as long as broad; elliptical, 

 obtuse at each end. 



Obovate, reversely ovate, the broad part .of 

 the egg being uppermost. 



Obsolete, imperfectly developed or abortive ; 

 appUed to the calyx when it is in the form of 

 anm. 



Obtuse, not pointed, with a rounded or blunt 

 termination. 



Obvolute, margins of one leaf alternately 

 overlapping those of the leaf opposite to it. 



Ochrea or OcREA, boot, applied to the sheath- 

 ing stipule of Polygonaceas. 



OCTANDROUS, having eight stamens. 



OcTO, eight, in composition Oct. 



OcTOGVNOUS, having eight styles. 



CEciuM and CEcious, in composition, have 

 reference to the position of the reproductive 

 organs, as Andrmcium^ the staminal organs ; 

 Dicectotcs, stamen and pistil in different 

 flowers. 



Officinal, sold in the shops. 



Offset, same as Propagtdunt. 



Oleraceous, used as an esculent potherb. 



Oligandrous, stamens under twenty. 



Oligos, few or in small number ; in composi- 

 tion Oligo and Olig. • 



Oligospermous, plant having few seeds. 



Omphalode, the central point of the hilum, 

 where the nourishing vessels enter. 



OoGONiA, equivalent to Archegonia in Fungi. 



Oophoridium, organ in Lycopodiacese contain- 

 ing large spores. 



OosPORANGiA, spore-cases in some Algse. 



Oospore, a fertilised spore in Fungi. 



Opaque, dull, not shining. 



Operculum, lid, applied to the separable part 

 of the theca of Mosses ; also applied to the 

 lid of certain seed-vessels ; Operculate, open- 

 ing by a lid. 



Opposite, applied to leaves placed on opposite 

 sides of a stem at the same level. 



Orbicular, rounded leaf with petiole attached 

 to the centre of it. 



Organogeny, the development of organs, in- 

 cluding their primitive condition and their 

 gradual evolution. 



Organography, the description of the organs 

 of plants. 



ORTHOPLOCEiE, Crucifcrse having conduplicate 

 cotyledons. 



Orthos, straight ; in composition Ortho, same 

 as Latin Recites. 



Orthosperm^, seeds with the albumen flat on 

 its inner face. 



Orthotropal and Orthotropous, ovule 

 with foramen opposite to the hilum ; embryo 

 with radicle next the foramen, and hence in- 

 verted. 



Osmose, the force with which fluids pass 

 through membranes in experiments on exos- 

 mose and endosmose. 



Oval, elliptical, blunt at each end. 



Ovary, the part of the pistil which contains 

 the ovules. 



Ovate, shaped like an egg, applied to a leaf 

 with the broader end of the egg next the 

 petiole or axis ; Ovate-lanceolate^ a lanceolate 

 leaf, which is somewhat ovate. 



Ovenchyma, tissue composed of oval cells. 



Ovule, the young seed contained in the ovary. 



Pagina, applied to the surface of the leaf, or 

 any flat surface. 



Paleontology, the study of Fossils. 



Paleophytology, the study of Fossil plants. 



Palate, the projecting portion of the under 

 lip of personate flowers. 



Palea or Pale, the part of the flower of 

 Grasses within the glupie ; also applied to 

 the small scaly laminae which occur in the 

 receptacle of some Compositae. 



Paleaceous, chaffy, covered with small erect 

 membranous scales. 



Palmate and Palmatifid,. applied to a leaf 

 with radiating venation, divided into lobes to 

 about the middle. 



Palm ATI partite, applied to a leaf with radi- 

 ating venation, cut nearly to the base in a 

 palmate manner. 



Panduriform, shaped like a fiddle, applied to 

 an oblong leaf, with a sinus on each side 

 about the middle. 



Panicle, inflorescence of Grasses, consisting 

 of spikelets on long peduncles coming off in 

 a racemose manner. 



Paniculate, forming a panicle. 



Panspermism, development of cells from germs 

 introduced from the atmosphere. 



Papilionaceous, corolla composed ofvexillum, 

 two alae, and carina, as in the Pea. 



Papillated and Papillose, covered with 

 small nipple-like proniinences. 



Pappus, the hairs at the summit of the ovary 

 or achene in Compositse. They consist of 

 the altered calyx. Pappose, provided 

 with pajjpus. 



ParAj beside or in place of; often used in com- 

 position. 



Paraphyses^ filaments, sometimes articulated, 

 occurring in the fructification of Mosses and 

 other Crjrptogams ; also applied by some 

 authors to abortive petals or stamens. 



Parasite, attached to another plant, and deriv- 

 ing nourishment from it. 



Parenchyma, cellular tissue. 



