Page:TheTreesOfGreatBritainAndIreland vol01.djvu/170

142 ::5. Sorbus. Ovary with 3 or 5 cells, styles free. Fruit crowned by the calyx, endocarp membranous or coriaceous. Leaves pinnate. Includes two sub-sections:—
 * Aucuparia, with 3-celled ovary and small globular fruit, and
 * Cormus, with 5-celled ovary and large pear- or apple-shaped fruit.
 * 6. Aria. Ovary with 2 to 5 cells, styles free. Fruit crowned by the calyx, endocarp membranous, flesh granular. Leaves simple. Includes the whitebeam and its allies.
 * 7. Micromeles. Ovary with 2 to 3 cells. Fruit small, globose, umbilicate, endocarp membranous or coriaceous, calyx-lobes deciduous. Leaves simple. Includes several Asiatic species.

I. Leaves regularly pinnate, the leaflets being separate and never decurrent by their bases on the rhachis.


 * A. Aucuparia. Mountain ashes. Leaflets unequal-sided at the base. Fruit small, not exceeding ⅓ inch.


 * (1-3) Winter buds white-tomentose.


 * 1. Pyrus Aucuparia, Gaertner. Europe, Northern Asia, Japan. Young branchlets and leaves pubescent, adult leaves glabrous or only slightly pubescent beneath. The common mountain ash.
 * 2. Pyras lanuginosa, DC. South-eastern Europe. Only differs from the preceding in the adult leaves being densely woolly beneath.
 * 3. Pyrus thianschanica, Regel. Chinese Turkestan. Young branchlets and leaves glabrous; adult leaves quite glabrous beneath and conspicuously veined on the upper surface.


 * (4-5) Winter buds shining, glutinous, glabrous or sparingly pubescent, the pubescence oppressed and of a rusty colour.


 * 4. Pyrus americana, Torrey and Gray. North America. Leaflets long, narrow, acuminate, glabrous beneath.
 * 5. Pyrus sambucifolia, Chamisso and Schlechtendal. Manchuria, North-East Asia, Japan, North America. Leaflets broader than in No. 4, obtuse or acute (not acuminate), more or less pubescent beneath.
 * B. Cormus. True Service. Leaflets nearly equal sided at the base. Fruit large, inch diameter or more.