liAAUliOUK OK TkKKK OK Til K XoRTIIKRX StATKS AND CaNADA. 439 



eaiiy times and is now planted in all temperate resions, its fruit having been vastly improved 

 upon Its natural condition, and it has escaped and become commonlv naturalized 'throughout 

 eastern I nited States and Canada. The trees attan a height ol: from 30-50 ft., with wide 

 spreading branches and the trunk .sometimes 2 or o .t. in diameter. The close-grained hard 

 wood IS valued m turner.v for certain uses. Leaves ovate to oval, mostly rounded or cordate 

 at base, acute or acuminate, irregularly serrate, gray-tomentose at first (as are all new 

 growths), at maturity glabrous dull green above, more or less pubescent beneath and soft in 

 texture: petioles stout. Floirers appearing with the leaves, white or more or less pink- 

 Hushed. 1-2 in. across, in close clusters with stout woodv pedicels %-lyo in long- calyx 

 tomentose. Fniit very various in size and quality, that of seedling trees not true to the 

 parents and generally inferior. 



Siberia?,' Grab, Pi/rux pruiiifoUa Willd. Occasionally found escaped from cultivation. 

 It IS thought to be a hybrid between P. Malus L. and the Asiatic /'. haeenta L. It is a small 

 spreading tree differing from the P. Xfalux in having smooth and sometimes entire leaves, with 

 longer more slender and smaller leaf and fruit-stems and small firm tart fruit. 



THE MOUNTAm-ASHES. Genus SORBUS L. 



Trees and shrubs of about seven widely distributed species of the north temperate regions, 



three being natives of North America and a fourth is a naturalized species introduced from 



the Old World. They have a smooth aromatic bark, stout branchlets and large buds with 



imbricated scales, the innermost of Avhich are accrescent. 



Lenreti alternate, deciduous, pinnately compound (in the American species) with serrate 

 leaflets; stipules caducous. Flowers perfect, regular, white, in terminal compound cymes; 

 <alyx with urn-shaped tupe and five persistent lobes imbricated in the bud ; petals 5, white, 

 spreading, rounded, with short claw; stamens numerous; ovary inferior with usually 3 carpels, 

 3 distinct styles and truncate stigmas; ovules 2 in each cell, erect. Fruit a small red berry- 

 llUe pome Avith thin flesh, papery carpels and containing in each cell 1 or 2 pointed erect seeds 

 with smooth cartilaginous coat ; cotyledons fleshy, plano-convex, with no albumen. 



KEY TO THE SPECIES. 

 a Leaflets glabrous above and 



Long acuminate ; fruit y^ in. or less in diameter S. Americana. 



Acute or obtuse ; fruit about y, in. in diameter S. decora. 



a'^ Leaflets pubescent both sides S. Aucuparia. 



For species see pp. 2,iS-'2-'il and the foUoiring: 

 Old AVorld Mountain-Asii, or Rowan-tree. Horhus Aucuparia L. This is a round-headed 

 tree sometimes 50 or 60 ft. in height with trunk from 1-21/, ft. in diameter growing naturally 

 in the forests of northern Europe and Asia. It has been extensively planted in this countr.v 

 for ornamental purposes and has become naturalized in places. Leaves with 9-15 oblong to 

 oblong-lanceolate leaflets '54-2 in. long serrate, entire at base, more or less pubescent both sides 

 •especially beneath ; branchlets and petioles pubescent ; buds tomentose. Floirers Vr. in. across 

 in mostly tomentose cor,vmbs 4-0 in. across. Fruit about 1/3 in. across. 



THE SERVICE-BERKIES. Genus AMELANCHIER Medic. 



Trees and shrubs with slender branches and long-pointed buds covered with closely 

 imbricated scales, the innermost of which are accrescent. They are of extensive distribution 

 throughout tlie north temperate regions of both hemispheres. Three arborescent species are 

 known in North America, two of which are found in the Atlantic states and the third in the 

 Pacific coast region and eastward to Lake Superior. 



Laves deciduous, simple, alternate, petiolate, serrate or entire, piunately-veined, con- 

 duplicate in the bud ; stipules linear, pink and caducous. Flowers in racemes with slender 

 hibracteol.tte pedicels : calyx with campanulate tube, adnate to the ovary, and five narrow 

 acute reflexed persistent lobes ; disk green, nectiferous ; petals five, elongated, white, with 

 short claws; stamens numerous inserted on the rim of the calyx tube with subulate persistent 

 styles and oblong anthers ; ovary inferior with 5 cells each partly divided by a false partition ; 

 styles 2-5 united and pubescent below, spreading above, and with truncate stigmas ; ovules 

 erect, 2 in each cell. Fruit a small berry-like subglobose pome, purplish or blue when ripe 

 and crowned with the calyx lobes and remnants of the filaments, with juicy pleasantly 

 flavored fruit and membranaceous carpels ; seeds 5-10, oblong, compressed, with brown 

 coriaceous testa, straight embryo and no albumen. 



The name is the popular name of the European species in Savoy. 



KEY TO THE SPECIES. 

 a Leaves sharply serrate and 



Ovate to ovate-oblong, acute to acuminate at apex A. Canadensis. 



Oblong to elliptical, acute to rounded at apex A. obovalis. 



•a^ Leaves coarsely dentate towards the rounded auex A. ainifolia. 



For species see pp. 2Jf2-2Ji3 and the folloicinri: 



