GLOSSARY OF TECHNICAL TERMS 



817 



Obtuse. Blunt or rounded at the apex. 



Operculate. Furnished with a lid. 



Orbicular. A fiat body circular in outline. 



Orthotropous. Descriptive of an ovule with a straight 

 axis much enlarged at the insertion and the ori- 

 fice at the other end. 



Oval. Broadly elliptical. 



Ovate. Of the shape of the longitudinal section of 

 a hen's egg, with the broad end basal. 



Ovoid. Solid ovate or solid oval. 



Ovule. The part of the flower which becomes a 

 seed. 



Palmate. Lobed or divided, with the sinuses point- 

 ing to or reaching the apex of the petiole or insertion. 



Panicle. A loose compound flower-cluster. 



Papilionaceous. Butterfly-like. 



Papilliform. The shape of papillae. 



Papillate. Bearing papillae, minute nipple-shaped 

 papillose projections. 



Parietal placenta. A placenta borne on the wall of 

 the ovary. 



Pedicel. The stalk of a flower in a compound inflo- 

 rescence. 



Pedicellate. Borne on a pedicel. 



Peduncle. A general flower-stalk supporting either a 

 cluster of flowers, or a solitary flower. 



Pedunculate. Borne on a peduncle. 



Peltate. Descriptive of a plane body attached by its 

 lower surface to the stalk. 



Penniveined. Same as pinuately veined. 



Perfect. Said of a flower with both stamens and 

 pistil. 



Perianth. The envelope of a flower consisting of 

 calyx, corolla, or both. 



Pericarp. The fructified ovary. 



Persistent. Said of leaves remaining on the branches 

 over their first winter, and of a calyx remaining 

 under or on the fruit. 



Petal. A division of the corolla. 



Petiolate. Having a petiole. 



Petiole. The footstalk of a leaf. 



Petiolulate. Having a petiolule. 



Petiolule. The footstalk of a leaflet. 



Pilose. Hairy, with soft and distinct hairs. 



Pinnse. The primary divisions of a twice pinnate 

 leaf. 



Pinnate. A leaf with leaflets arranged along each 

 side of a common petiole. 



Pistil. The female organ of a flower, consisting of 

 ovary, style, and stigma. 



Pistillate. Said of a unisexual flower without fertile 

 stamens. 



Pith. The central cellular part of a stem. 



Placenta. That part of the ovary which bears the 

 ovules. 



Plumule. The bud or growing part of the embryo. 



Pollen. The fecundating cells contained in the an- 

 ther. 



Polygamo-dicecious. Said of flowers sometimes per- 

 fect and sometimes unisexual, the 2 forms borne on 

 different individuals. 



Polygamo-moncecious. Said of flowers sometimes 

 perfect and sometimes unisexual, the 2 forms borne 

 on the same individual. 



Polygamous. Said of flowers sometimes perfect and 

 sometimes unisexual. 



Pome. An inferior fruit of 2 or several carpels in- 

 closed in thick flesh. 



Posterior. The side of an axillary flower next the 

 axis of inflorescence. 



Prickle. Outgrowth of the bark. 



Proliferous. Bearing offshoots. 

 ' Puberulent. Very slightly pubescent. 



Puberulous. Minutely pubescent. 

 Pubescence. A covering of short soft hairs. 



Pubescent. Clothed with soft short hairs. 



Pulvinate. Cushion-shaped. 



Punctate. Dotted with depressions or translucent 

 internal glands, or with colored dots. 



Punctulate. Minutely punctate. 



Raceme. An indeterminate or centripetal inflores- 

 cence with an elongated axis and flowers on pedicels 

 of equal length. 



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



Radial. Belonging to a ray. 



Radicle. The initial stem in an embryo. 



Receptacle. The axile portion of a blossom bearing 

 sepals, petals, stamens, and pistils ; the axis or 

 rhachis of the head, spike, or other flower-cluster. 



Reniform. Kidney-shaped. 



Resupinate. Upside down. 



Reticulate. Netted. 



Retrorse. Directed backward or downward. 



Retuse. With a shallow notch at a rounded apex. 



Revolute. Rolled backward from the margins or apex. 



Rhaphe. The adnate cord or ridge connecting the 

 hilum wdth the chalaza in an anatropous ovule. 



Rhombic. Having the shape of a rhomb. 



Rhomboidal. Approaching a rhombic outline ; quad- 

 rangular with the lateral angles obtuse. 



Rind. The bark of some endogenous stems, like that 

 of Palms. 



Rostrate. Narrowed into a slender tip. 



Rotate. Circular, flat and horizontally spreading. 



Rugose. Wrinkled. 



Rugulose. Slightly wrinkled. 



Ruminate. Looking as if chewed, like the albumen 

 of the nutmeg. 



Sagittate. Shaped like an arrowhead. 



Samara. An indehiscent winged fruit. 



Sapwood. The young living wood of an exogenous 



stem. 

 Scales. Thin scarious bodies, usually degenerate 



leaves. 

 Scarious. Thin, dry and membranaceous, not green. 

 Scobiform. Having the appearance of sawdust. 

 Scorpioid. A form of unilateral inflorescence circi- 



nately coiled in the bud. 

 Scurfy. Covered with small bran-like scales. 

 Seed. The fertilized and mature ovule, the result of 



sexual reproduction in a flowering plant. 

 Segment. One of the divisions into which a leaf, 



calyx, or corolla may be divided. 

 Semianatropous. Same as amphitropous. 

 Sepals. The divisions of a calyx. 

 Septicidal. Descriptive of a capsule splitting through 



the lines of junction of the carpels. 

 Septum. A partition. 

 Serrate. Beset with teeth. 

 Serrulate. Serrate with small fine teeth. 

 Sessile. Without a stalk. 

 Setose. Beset with bristles. 

 Setulose. Beset with minute bristles. 

 Sheath. A tubular or enrolled part or organ. 

 Sinistrorse. Turned or directed to the left. 

 Sinus. A recess between the lobes of a leaf. 

 Spatulate. Oblong with the lower end attenuated. 

 Spike. An indeterminate inflorescence with flowers 



sessile on an elongated common axis. 

 Spine. A sharp-pointed woody body, commonly a 



modified branch or stipule. 

 Spinescent. Ending in a spine. 

 Spinose. Furnished with spines. 

 Stamen. One of the male organs of a flower. 

 Staminate. Said of unisexual flowers without pistils. 

 Staminodium. A sterile or much reduced stamen. 

 Stigma. The part or surface of a pistil which receives 



the pollen for the fecundation of the ovules. 

 Stigmatic. Relating to the stigma. 

 Stipe. A stalk-like support of a pistil or of a carpel. 

 Stipel. An appendage to a leaflet analagous to the 



stipules of a leaf. 

 Stipitate. Having a stipe. 

 Stipulate. Having stipules. 

 Stipules. Appendages of a leaf, placed one on each 



side of the petiole at its insertion. 

 Stomata. Breathing pores or apertures in the epider- 

 mis of leaves connecting internal cavities with the 



external air. 

 Stomatiferous. Furnished with stomata. 



