164 POMACES. SORBUS. 



MALUS. 



glabrate; lobes of the calyx triangular, acute, often serrate, about as long 

 as the tube, dark red, petals orbicular, 3-4 lines long: fruit scarlet, 

 obovoid, 4-6 lines long; carpels distinct. Common along the Columbia 

 river and its tributaries east of the Cascade Mountains. 



2 SORBUS Tourn. L. Gen. n. 623. 



Shrubs or small trees with unequally pinnate deciduous 

 leaves and small flowers in terminal compound cymes. Calyx 

 urceolate, 5-lobed. Petals 5, alternate with the lobes of the 

 calyx. Stamens 20. Styles 3-5, distinct. Carpels 35, coria- 

 ceous, 1-celled, 2-ovuled, 1-seeded. Fruit small, globose or py- 

 riform. 



S. sambneifolia Roem. Syn. Monogr. iii, 39. Pyrus sambucifolia 

 Cham. & Schlecht. A shrub, 4-12 feet high with coarse ascending 

 branches : nearly glabrous, the leaf-buds and inflorescence usually spar- 

 ingly villous : leaflets 4-8 pairs, oblong to lanceolate, acute; sharply ser- 

 rate from near the base, 1-2 inches long : cymes flattish, often 4 to 6 inches 

 in diameter and many-flowered ; lobes of the calyx broadly subulate, 1-2 

 lines long; petals white, orbicular, attenuate below to a short claw, 2-3 

 lines long, fruit globose, about three lines in diameter, coral-red, bitter. 

 On high mountains, Oregon to Alaska. 



S. occidentalis Greene Fl. Fr. 54. Pyrs occidentals Watson Proc. 

 Am* Acad. 'xziii, 263. A shrub 2-6 feet high with rather coarse erect 

 branches ; glabrous throughout or the inflorescence partly hairy : leaflets 

 3-5 pairs, oblong-elliptical, obtuse, sometimes mucronate, dentate usu- 

 ally only toward the apex, rarely below the middle, sometimes entire, 

 6-20 lines long : cymes small, usually rather iew-flowered ; calyx glabrous, 

 with short triangular lobes : petals white, 1-2 lines long, orbicular, ab- 

 ruptly narrowed below to a short claw; styles villous at base: fruit pyri- 

 form, red, 4 lines long. On high mountains near perpetual snow, Wash- 

 ington to California and the Rocky Mountains. 



3 MALUS Tourn. (APPLE). 



Small deciduous trees with simple more or less serrate leaves 

 and reddish or white flowers in simple corymbose cymes at the 

 ends of short lateral branchlets. Calyx tube urceolate, the 

 limb 5-lobed, petals 5, usually rather large. Stamens 20. Styles 

 5, more or less united at base. Carpels 5, chartaceous in fruit, 

 2-seeded, 1-celled, wholly covered by the adnate calyx-tube. 

 Fruit globose to oblong, depressed at both ends, the flesh con- 

 taining malic acid and destitute of grit-cells. 



M. rivularis Roem. Syn. Monog. iL, 215. Pyrus rivularis Dougl. A 

 small tree 15-30 feet high : leaves ovate-lanceolate, sharply serrate, some- 

 times obscurely 3-lobed, more or less woolly-pubescent, 1-3 inches long ; 

 stipules setaceous : cymes shortly racemose, leafy at base; pedicels slen- 

 der, 1-2 inches long, pubescent; calyx pubescent, the limb at length de- 

 ciduous, the lanceolate acuminate lobes as long as the tube; petals orbicu- 

 lar, abruptly contracted below to a short claw, 4-6 lines long, white; 

 styles 2-5, united at base : fruit oblong, 4-6 lines in diameter. Common 

 in swales and along streams, northern California to Alaska. 



4 AMELANCHIER Lobelius; Lindl. Linn. Trans, xiii, 100. 

 ( SERVICE-BERRY ) . 



Shrubs or small trees with simple alternate deciduous leaves, 

 small racemes of white flowers and black or purplish edible fruit. 



