Text-book of structural and physiological botany . Jive-lohed^ &c., or thelatter is usually called palmatilobed. Compound leaves are classed under two principal heads,the digitate di\-\di ih^pinnate. In the former, several leaflets—3, 5, 7, or less often 4—spring from the apex of the commonpetiole. The most common number is 3, as in the clover(Fig. 182, p. 102), when the leaf is said to be ternate or The External Form of Plants, lOI trifoliolate. When the petiole divides at its apex into twomain divisions, each of which bears several leaflets, it ispedate (Fig. 183). The a pinnate leaf has its
Text-book of structural and physiological botany . Jive-lohed^ &c., or thelatter is usually called palmatilobed. Compound leaves are classed under two principal heads,the digitate di\-\di ih^pinnate. In the former, several leaflets—3, 5, 7, or less often 4—spring from the apex of the commonpetiole. The most common number is 3, as in the clover(Fig. 182, p. 102), when the leaf is said to be ternate or The External Form of Plants, lOI trifoliolate. When the petiole divides at its apex into twomain divisions, each of which bears several leaflets, it ispedate (Fig. 183). The a pinnate leaf has its leaf j 1 lets arranged on eachside of a common elon-gated petiole, which isthen called the the rachis ends in aterminal leaflet [so thatthe number of the pinnaeis uneven] the leaf isunequally pinnate or hn-paiipinnate (Fig. 184);if the number of leafletsis an even number itis paripinnate or equallypinnate (Fig. 185); andin this case the rachis may run into a tendril or a point(Fig. 185), or may end abruptly. The leaflets may be. Fig. 178.—Palmatifid leaf of the castor-oilplant, Rici7tus communis.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyorkjwileysons
