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Nerve. One of the lines or veins running through a leaf. 



Node, A place on a twig where one or more leaves originate. 



Non-porous. Without pores. 



Nut. A dry, 1-seeded, iiidehiscent fruit with a hard covering. 



Nutlet. A small nut. 



Ob-. A prefix meaning inverted or reversed. 



Oblique. Slanting, uneven. 



Oblong. About twice as long as wide, the sides nearly parallel. 



Obovatc. Reversed egg-shaped. 



Obtuse. Blunt. 



Odd-pinnate. With an odd or unpaired leaflet at the tip of the compound leaf. 



Opposite. Said of leaves and buds, directly across from each other. 



Orbicular. Circular. 



Ovary. The part of the pistil producing the seed. 



Ovate. Egg-shaped. 



Ovoid. Egg-shaped or nearly so. 



Ovule. The body which after fertilization becomes the seed. 



Palmate. Hand-shaped; radiately divided. 



Panicle. A compound flower cluster, the lower branches of which are longest and bloom first. 



Parasite. Growing upon and obtaining its nourishment from some other plant. 



Parenchyma. A class of plant tissue found in the green layers of the bark, in wood and pith. 



Pedicel. The stalk of a single flower. 



Peduncle. The stalk of a flower cluster or of a solitary flower. 



Pendulous. Hanging. 



Perennial. Last for more than onp year. 



Perfect. A flower with both stamens and pistils. 



Perianth. A term applied to the calyx and corolla taken together. 



Persistent. Remaining after blooming, fruiting, or maturing. 



Petals. The part of a corolla, usually colored. 



Petiole. The stalk of a leaf.. 



Pinna. A division, part, or leaflet of a pinnate leaf. 



Pinnate. With leaflets On both sides of a stalk. 



Pistil. The central part of the flower containing the prospective seed. 



Pistillate. Bearing pistils but no stamens. 



Pith. The soft central part of a twig. 



Pod. Any dry and dehiscent fruit. 



Pollen, The dust-like substance found in the anthers of a flower. 



Pollination. The process of bringing the pollen of the male flower in contact with the stigma of 



the female flower. 



Polygamous. With both perfect and imperfect, staminate or pistillate, flowers. 

 Pome, A fleshy fruit with a core, such as the apple. 

 Prickle. A sharp-pointed, needle-like outgrowth. 

 Profligate. Wasteful, extravagant. 



Propagative. Said of buds containing reproductive organs. 

 Pseudo-l A prefix meaning false, not true. 

 Pubescent, Hairy. 



Pungent. Ending in a sharp point; acrid. 



Pyramidal. Shaped like a pyramid with the broadest part near the base. 

 Raceme. A simple inflorescence of flowers borne on pedicels of equal length and arranged on a 



common, elongated axis. 

 Ray. See Medullary ray. 



Reflexed. Abruptly turned backward or downward. 

 Reforestation. The process of putting a forest growth upon an area which had its forest growth 



removed recently. 



Regular. Said of flowers which are uniform in shape or structure. 



Resin-ducts, A passage for the conduction of resiu found in the leaves and wood of the Pines. 

 Ring-porous. Said of wood which has pores of unequal size, the larger ones being found in the 



spring wood and the smaller in the summer wood. 

 Rugose. Wrinkled. 



Rugosities. Projections, wrinkles, knobs. 

 Saccharine. Pertaining to or having the qualities of sugar. 

 Samara. An indehiscent winged fruit. 



Sapwood, The recently formed, usually light wood, lying outside of the heartwood. 

 Scales. The small, modified leaves which protects the growing-point of a bud or the part of a 

 cone which bears the seeds. The small flakes into which the outer bark of a tree divides. 

 Scurfy. Covered with small bran-like scales. 

 Sepal. One of the parts of the calyx. 

 Serrate. Having sharp teeth pointing forward. 

 Sessile, Seated; without a stalk. 

 Sheath, A tubular envelope or covering. 



Shrub. A low woody growth which usually branches near the base. 

 Silky. Covered with soft, straight, fine hairs. 

 Simple, Consisting of one part, not compound. 

 Sinus. The cleft or opening between two lobes. 

 Species. A group of like individuals as Red Oak, White Oak, etc. 

 Spike. An enlongated axis bearing sessile flowers. 



