374 GLOSSARY 



Lined. Rather lightly ridged or ribbed. 



Lobed. Divided rather deeply, as applied to leaves. 



Lucky-nuts or knots. A name sometimes given by children 

 to woody structures imbedded in the bark of beech, olive, 

 etc. They represent loosely attached rudimentary 

 branches and are comparable with burls. 



Matted. Growing in very compact tufts, or so as to form a 

 low close cover to the ground. 



Medullary rays. The plates radiating between pith and cor- 

 tex in exogenous stems. Like pith, they serve for the 

 storage of reserve food, usually starch as may be demon- 

 strated by a drop of iodine on the end of a twig cut in 

 winter. 



Member. A morphological part of a plant: root, stem, leaf. 



Membranaceous. Thinner and less firm than coriaceous. 



Metamorphosis. Conversion of a member of the plant body 

 into an organ differing in function from its usual form: 

 tendril of grape (stem) or clematis (leaf) and aerial roots 

 of poison ivy (root) as organs of climbing; spine of red- 

 haw (stem) or barberry (leaf), or pea-tree (leaf rachis) 

 as organs of protection; cladodia of butcher's broom 

 (stem), green roots of some conservatory orchids, etc.," as 

 foliage. 



Midrib. The strong main vein of a leaf. 



Milky. Colored, usually white, as applied to sap. 



Moniliform. Resembling a necklace of beads (sophora fruit). 



Monocotyledonous. Belonging to or characteristic of Monoco- 

 tyledoneae, one of the two main groups of angiosperms. 



Morphology. The science of form in living things, classify- 

 ing their parts as members from the view-point of origin 

 and development. However they may differ in function, 

 members that are morphologically of like origin are ho- 

 mologous one with another. 



Mucronate. With a short stiff abrupt point. 



Mucronulate. Minutely mucronate. 



