Page:TheTreesOfGreatBritainAndIreland vol01.djvu/171

 :::6. Pyrus Sorbus, Gaertner. Central and Southern Europe. Winter buds greenish, viscid, pubescent only at the tip; under surface of the leaves slightly pubescent in spring, soon becoming glabrous.

II. Leaves pinnate, but upper 3 or 5 leaflets coalesced or decurrent by their bases on the rhachis.
 * 7. Pyrus Aucuparia, Gaertner, var, satureifolia, Koch. A hybrid. Differs from the common form in the coalescence into one large segment of the 3 upper leaflets; leaflets glabrous beneath.
 * 8. Pyrus Aucuparia, Gaertner, var. decurrens, Koehne (Pyrus lanuginosa, Hort. non DC.) A hybrid. Upper leaflets decurrent on the rhachis by broad bases, often the upper 3 or 5 coalescing into one segment; leaflets tomentose beneath.

III. Leaflets pinnate or deeply cut at the base, with 1-4 pairs of segments, the upper part of the leaf lobed or serrate; leaves very variable in shape.
 * 9. Pyrus hybrida, Moench. A shrub of hybrid origin. Main axis of the leaf glandular above, under surface of the leaf sparingly pubescent, the parents being Pyrus aucuparia and Pyrus arbutifolia.
 * 10. Pyrus pinnatifida, Ehrhart. A hybrid. Axis of the leaf without glands, under surface densely grey tomentose.

IV. Leaves simple, lobed.
 * A. Under surface of the leaf glabrous, or nearly so, light green in colour.
 * 11. Pyrus torminalis, Ehrhart. Europe, Algeria, Asia Minor, and the Caucasus.
 * B. Under surface of the leaf grey tomentose.
 * 12. Pyrus cratægifolia, Savi. Italy. Leaves small, resembling those of a hawthorn, on each side 4-6 triangular-ovate toothed lobes.
 * 13. Pyrus latifolia, Boswell Syme. Britain, France, Spain, Central Europe. Leaves broad-oval with a wide base; lobes decreasing from below upwards, small triangular, separated by sinuses, which form a right angle and are not narrowed. In some forms the lobes are mucronate, in others cuspidate; and, in var. decipiens, the outline of the leaf is like intermedia, but the lobing is different.
 * 14. Pyrus intermedia, Ehrhart. Europe. Leaves elliptic, with a usually narrow base, lobes decreasing from below upwards, rounded, mucronate, separated by narrow sinuses, which are very acute or almost closed at their bases. This includes several forms:—
 * Mougeoti. Leaves with 9-12 pairs of nerves, lobes shallow.