. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. FORMS OF THE BASE 183 acumination is preceded by an abrupt contraction, it is distinguished as being Abruptly Acuminate (Figs. 511 and 513). If the narrowing be very gradual and not preceded by an abrupt contraction, the apex is said to be Tapering (Fig. 514); if still more drawn out. If the point of the leaf be extremely abrupt and very small, it is Mucronate when soft and herbaceous. Cuspidate when hard and stiff, like a Fig. 516. Digitalis leaf, with produced
. A manual of structural botany; an introductory textbook for students of science and pharmacy. Plant morphology. FORMS OF THE BASE 183 acumination is preceded by an abrupt contraction, it is distinguished as being Abruptly Acuminate (Figs. 511 and 513). If the narrowing be very gradual and not preceded by an abrupt contraction, the apex is said to be Tapering (Fig. 514); if still more drawn out. If the point of the leaf be extremely abrupt and very small, it is Mucronate when soft and herbaceous. Cuspidate when hard and stiff, like a Fig. 516. Digitalis leaf, with produced base, rounded apex, reticulate venation. 517. Apiculato apex. 518. Cuneate base (white-oak). 519. Cordate and produced base (violet). 520. Sagittale base (Polygonum). 621. Auriculate base (Aster). 522. Hastate base (Rumex). 523. Oblique base (Datura) > Any of the above-mentioned forms may be either Acute, when the ultimate apex is sharp (Figs. 508, 510, and 514), Obtuse when not so (Figs. 511 and 513), Blunt when very obtuse (Fig. 515), or even Rounded (Fig. 516). A leaf which has the midrib only extended into a bristle-shaped point is called Apiculate (Fig. 517), and this condition can apply to a cordate as well as to other forms of the apex. Forms of the Base.—The special forms of the base of the leaf-blade yield a correspondingly large number of terms. The terms cordate, truncate, rounded, blunt, obtuse, acute, acuminate, and abruptly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rusby, Henry Hurd, 1855-. Philadelphia and New York, Lea & Febiger
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