HISTORY AND BIBLIOGRAPHY 867 



Ligule. A. A strap-shaped corolla, as in the ray flowers of 

 composites, like the sunflower. B. A membranous projection on 

 inner side of leaf at top of sheath of some grasses. 



Linear. Long and narrow with nearly parallel margins. 



Lobe. A rounded portion or segment of any organ. 



Locule. Cavity within ovule. 



Lumen. Internal space or cavity of a cell. 



Lyrate. Lyre-shaped. 



Membranaceous or membranous. Thin, soft, and generally trans- 

 lucent. 



Malpighian Cells. Palisade cells in which one or more light lines 

 are present. 



Mesocarp. Middle layer of pericarp. 



Mesophyll. All of the fundamental tissue within the epidermis. 



Micropyle. Opening through which pollen tube passes. 



Monadelphous. Stamens united in one set. 



Monocotyledon. One cotyledon. 



Monoecious. With stamens and pistils in separate flowers on 

 the same plant. 



Mother Cells. Large dense cells in pollen lobes. 



Mucronate. Tipped with a short stiff point. 



Multiple. Compound. 



Muricate. Beset with short and hard or prickly points. 



Nerve. Any vein on the floral envelopes of grasses. 



Node. The place on a stem where one or more leaves are at- 

 tached; the joint. 



Nucellus. Nucleus of an ovule. 



Oblanceolate. Lanceolate with the broadest part toward the 

 apex. 



Oblong. Widely linear. 



Obovate. Inverted ovate. 



Obtuse. Blunt or rounded at the apex. 



Orbicular. Circular. 



Osteosclerids. Cells generally accompanying Malpighian Cells 

 in Leguminosae. They vary in shape and length, sometimes marked 

 by longitudinal canals. 



Ovary. Seed case of pistil. 



Ovate. Outline like that of an egg, with larger part downward. 



Ovule. Unripe seeds in ovary. 



Palet. Upper bract of the flower in grasses. 



Palisade cells. Elongated cells perpendicular to epidermis on 

 upper side of leaf. 



