208 GLOSSARY OF TERMS AND INDEX TO PART I 
Lobe. The separate, projecting parts of an irregularly edged leaf 
if few in number, 22. 
Lobed. Having lobes along the margin, 22. 
Margin of leaves, 22. 
Medullary rays, 13. 
Membranous. Thin and rather soft, and more or less translucent, 23. 
Midrib. The central or main rib of a leaf, 19. 
Monecious. With both pistillate and staminate flowers on the 
same plant, 25. 
Monopetalous. With the corolla more or less grown together at the 
base ; gamopetalous, 25. 
Mucronate. Tipped with a short abrupt point, 22. 
Multiple roots, 9. 
Nerved. Parallel-veined, as the leaves of some trees, 20. 
Netted-veined. With branching veins, forming a network as in the 
leaves of most of our trees, 20. 
Node. The part of a stem to which a leaf is attached, 18. 
Nut. A hard, unsplitting, usually one-seeded fruit, 27. 
Nutlet. A small nut. 
Obcordate. Heart-shaped, with the stem at the pointed end, 21, 22. 
Oblanceolate. Lanceolate, with the stem at the more pointed end, 21. 
Oblong. Two to four times as long as wide, with the sides some- 
what parallel, 20. 
Oblique. Applied to leaves when the sides are unequal, 21. 
Obovate. A reversed ovate, 21. 
Obovoid. A reversed ovoid; an egg form, with stem at the smaller 
end. 
Obscurely. Not distinctly; usually needing a magnifying-glass to 
determine. 
Obtuse. Blunt or rounded at tip, 22. 
Obvolute, 34. 
Odd-pinnate. Pinnate, with an end leaflet, 20. 
Once-pinnate. A compound leaf, with but a single series of leaflets 
along the central stem, 19. 
Opposite. With two leaves on opposite sides of a stem at a node, 18. 
Orbicular. Circular in outline, 20. 
Oval. Broadly elliptical, 20. 
Ovary. The part of the pistil of a flower containing the ovules or 
future seeds. 
Ovate. Shaped like a section of an egg, with the broader end near 
the stem, 21. 
