432 TREES IN" WINTER. 



Heartwood. The dead central portion of the trunk. 



Hoary. Grayish-white with a fine close down. 



Hybrid. A cross between two species or varieties. 



Internode. The portion of the stem between two nodes. 



Inversely triangular. Inverted triangular with the apex below. 



Involucre. The bracts surrounding- the flower cluster. 



Juvenile. Youthful, said of the leaves formed in the early stages of devel- 

 opment. 



Keeled. With a central ridge like the keel of a boat. 



Key. A winged fruit. 



Lanceolate. Lance-shaped ; similar to ovate but narrower with outline 

 tapering gradually to the apex. 



Lateral hud. A bud produced on the side of a twig. 



Leaf bud. A bud containing undeveloped leaves but not flowers. 



Leaf-scar. The scar left by the fall of the leaf (fig. 20). 



Leaf-stalk. The stem of a leaf. 



Lenticels. Corky spots on the surface which admit air to the interior of the 

 twig. 



Limbs. The larger branches. 



Linear. Long and narrow, several times as long as broad with parallel 

 edges, as the leaves of the Pines. 



Lobed. With rounded indentations running % to % the way from the margin 

 inward. 



Longitudinal. Lengthwise. 



Medullary rays. Rays of tissue extending from the pith toward the bark, 

 best seen in cross section. 



Midrib. The central vein of a leaf. 



Mucilaginous. Slimy when chewed. 



Naked bud. A bud without bud-scales. 



Needle. A narrow leaf as in the Pines. 



Node. The place on the twig at which one or more leaves were produced 

 (fig. 20). 



Niit. A large hard fruit as in Hickory, Oak and Chestnut. 



Nutlet. A small nut. 



Oblanceolate. Inverted lanceolate. 



Oblong. Two or three times longer than broad with about uniform diameter. 



Obovate. Inverted ovate. 



Opposite (leaves and leaf-scars). With two leaves or leaf-scars opposed 

 at a node. 



Oval. Broadly elliptical. 



Ovary. The part of the pistil producing the seeds. 



Ovate. Egg-shaped, with the broadest part below the middle. 



Persistent. Remaining on the tree. 



