70 
LEAVES. 
Leaves with respect to situation and position, are, 
Alternate , growing on different parts of ttte stem, observing equal dis- 
f tances. 
Opposite, growing on opposite parts of the stem. 
Decussate, crossing each other alternately in pairs. 
Verticillate, whorled or stellate growing in a circle round the stem. 
Fascicled, growing in a kind of bunch together. 
Crowned, a tuft of leaves at the summit of the stem. 
Appressed, when the leaf takes a direction parallel to the stem, and 
touches it in its whole direction. 
Rcclinatc, inclining downwards. 
Recurved, curved backwards. 
Iiiflcxed, curved inwards. 
Resupinatc, upper surface turned downwards. 
Natant, swimming on the surface of the water. 
Submersed, plunged under water. 
Emerged, raised above water. 
Leaves, with respect to form , are, 
Simple, undivided, as in the Lily. 
Compound, when several leaves grow on one petiole, as in the Rose. 
The leafets of compound leaves are like the simple leaves, 
distinguished by their peculiar form. 
Orbicular, or round loaves, are seldom seen ; if they are nearly round, 
they are said to be Sub-orbicular — See plate V. 
Ovate, the shape of an egg cut lengthwise, the base being rounder and 
broader than the extremity. — See plate V. 
Obovate, with the narrowest end towards the stem. 
Oval, an oval leaf, with both ends of the same breadth. — See plate V. 
Oblong, the length about three or four times more than the breadth. See 
ptate V. 
Spatulatc, of a roundish figure, tapering into an oblong base. 
Lanceolate, long and tapering, like an ancient lance. — See plate V. 
Linear, narrow, nearly of the same width through the whole length, like 
many of the grasses. — See plate V. 
Subulate, or awl form, narrow and curved at the point like a shoe ma- 
ker’s awl. 
Angled, having corners, the exact number not being determined. 
Triangular, or Deltoid, having three angles. — See plate V. 
Rhomboid, or Diamond-shape, having four angles. 
Leaves, with respect to composition, are, 
Digitate, like fingers, when several leafets arise from the summit of a 
simplQ petiole ; as in the Horse Chcsnut. 
Rinate, or Conjugate, when the number of leafets is two. 
Tcrnate, wheft the number is three. 
Pinnate, when several leafets arise from the side of a petiole : as in the 
Rose and Locust. — See plate V. 
The Summit of leaves may be, 
Acute, as in the willow, or, 
Acuminate, which is still more slender and pointed. 
Obtuse, when it is blunt or rounded. 
Mucronate, when the extremity of a leaf has a sharp point like a bristle. 
Truncate , when the leaf seems to have been cut oft'. 
The Margins of leaves, are, 
Form — Composition — Summit — Margins. 
