Trees; a handbook of forest-botany for the woodlands and the laboratory . 253).w. ii. 14 210 WHITE POPLAR, ETC. Petioles of smaller leaves 2—3 cm. long, round and slender,those of larger leaves 5—9 cm. and compressed, white-tomentose. Lamina thick and tough, deep green and be-coming glabrous above (the venation paler), densely whitecottony or tomentose beneath; though there are varietieswhere this tomentum is greyer or even disappears. Upperstomata absent. Autumn leaves dark brown. Venation as in P. alba, var. canescens, but more palmate,in accordance with the greater segmentation of the leaf.
Trees; a handbook of forest-botany for the woodlands and the laboratory . 253).w. ii. 14 210 WHITE POPLAR, ETC. Petioles of smaller leaves 2—3 cm. long, round and slender,those of larger leaves 5—9 cm. and compressed, white-tomentose. Lamina thick and tough, deep green and be-coming glabrous above (the venation paler), densely whitecottony or tomentose beneath; though there are varietieswhere this tomentum is greyer or even disappears. Upperstomata absent. Autumn leaves dark brown. Venation as in P. alba, var. canescens, but more palmate,in accordance with the greater segmentation of the leaf. [The leaves of Pyrus Aria are sometimes pinnatelylobed, or even completely pinnate below (p. 175), and themore pubescent forms of Quercus Robur, var. pubescens, maybe hoary white beneath (p. 215).] tt Leaves not tomentose beneath, but glabrousor nearly so ; cuneiform, with more or lesstapering base. The alternate secondariesfork over the sinuses. Shoots thorny. Gratwgus Oxycantka, L. Hawthorn, Whitethorn (). Thorny shrub. Leaves variable, 3—7 x 2—6 cm.,. Fig. 66. Hawthorn, Crateegus Oxycantha, p. 210 (D). broadly ovate or obovate, cuneiform, entire at the base, cutsometimes very deeply into 3—5, or even 7, pseudo-palmate HAWTHORN, ETC. 211 lobes, each acute and irregularly crenate-dentate, serrateor lobed ; thin and tough, bright green, shining glabrousor glabrescent, or pubescent when young, especially onthe margins and veins, bluish or yellowish green often large and leafy, half-ovate and 1—2 cm. up to as long as the midrib. Autumnleaves brown. Venation pinnate or with pseudo-palmate base, thesecondaries running direct and nearly straight to themargins, where they end in the teeth; or they fork, andthe branches end similarly; but alternating with thesethere are other secondaries, or their branches, each ofwhich goes direct to the sinus between two lobes, and mayfork over it. The basal secondaries sometimes come off asif pri
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