Proceedings of the Ohio State Academy of Science 183 



Head. A dense, round inflorescence of sessile or nearly sessile flowers. 

 Herbaceous. Leaf-like in texture and color. 

 Hirsute. Having rather coarse stiff hairs. 

 Hispid. With bristly stiff hairs. 

 Hydrophyte. A water plant. 



Hypogynous. Having the calyx, corolla, and androeciuni below the 

 gynoecium. 



Imbricated. Overlapping. 



Imperfect. Monosporangiate flowers ; having only stamens or only 

 carpels. 



Incised. Cut into sharp lobes. 



Included. Not projecting beyond surrounding parts. 



Indehiscent. Not opening. 



Inequilateral. With unequal sides. 



Inferior. Situated or arising below other organs. 



Inflorescence. The flower cluster of a plant and its mode of arrange- 

 ment. 



Internode. The part of a stem between two successive nodes. 



Introrse. Facing inwards. 



Involucre. A whorl of bracts subtending a flower or flower cluster. 



Involute. Rolled inwardly. 



Irregular. A flower with one or more organs of a set unlike the others. 



Isobilateral. A flower or organ which can be cut into equal halves by 

 two planes, the halves of the one being unlike those of the 

 other. 



Lanceolate. Lance-shaped. 



Lateral bud. An axillary bud, any bud not the terminal bud of a branch. 



Latex. The milky sap of certain plants. 



Leaflet. One of the divisions of a compound leaf. 



Leaf scar. The scar or cicatrix formed wdiere the petiole of a leaf sepa- 

 rates from the stem or twig. 



Legume. A simple, dry fruit dehiscent along both sutures. 



Lenticel. A small usually oval or rounded spot on the bark of a twig 

 or stem, produced by a special tissue of cells under a stoma 

 and breaking through the epidermis. 



Limb. The expanded part of a petal, sepal, or sympetalous corolla. 



Linear. A long and narrow organ with the sides nearly parallel. 



Lobed. Divided to about the middle or less. 



Loculicidal. A capsule which splits longitudinally through the middle 

 of the back of each cavity or component carpel. 



Medullary rays. Strips of cells passing radially through the wood from 

 the pith or annual rings to the bark. 



