470 MALACEAE 



1. Sorbus occidentalis (S. Wats.) Greene. Western Mountain Ash or Rowan. 



Fig. 2529. 



Pyrus occidentalis S. Wats. Proc. Amer. Acad. 23: 263. 1888. 

 Sorbus occidentalis Greene, Fl. Fran. 54. 1891. 



Low shrub about 1 m. high, the young branches pubescent. Leaves bearing 7-11 leaflets, the 

 rachis and petiole sparsely pubescent; leaflets 2-4 cm. long, oblong, obtuse, serrate only near 

 the apex, sometimes entire, dull on the upper surface; cyme 4-10 cm. broad, its branches pubes- 

 cent ; petals about 4 mm. long ; fruit globose, 5-6 mm. in diameter, purplish red and glaucous. 



Alpine slopes, Hudsonian Zone; British Columbia to Oregon in the Cascade and Olympic Mountains. Type 

 locality: Cascade Mountains, latitude 49°. June- Aug. 



2. Sorbus sitchensis M. Roem. Sitka Mountain Ash or Rowan. Fig. 2530. 



Sorbus sitchensis M. Roem. Fam. Nat. Syn. 3: 139. 1847. 



Pyrus sitchensis Piper, Mazama 2: 107. 1901. 



Sorbus cascadensis G. N. Jones, Univ. Wash. Pub. Biol. 7: 174. 1938. 



Shrub 2-5 m. high with smooth bark, the young branches pubescent. Leaves bearing 9-13 

 leaflets, the rachis and petioles pubescent ; leaflets linear to oblong-lanceolate, acuminate to acute, 

 sharply serrate to near the base, glabrate, shining above ; fruit ellipsoid, coral red, 7-8 mm. long. 



Mountain slopes, Transition Zone; Alaska to western Montana, and the Cascade Mountains to Crater Lake, 

 Oregon. Type locality: Sitka, Alaska. May-July. 



Sorbus sitchensis subsp. californica (Greene) Abrams. (Sorbus calif omica Greene, Pittonia 4: 131. 1900. 

 Pyrus sitchensis var. californica Smiley, Univ. Calif. Pub. Bot. 9: 233. 1921. Sorbus sitchensis var. densa 

 Jepson, Man. Fl. PI. Calif. 508. 1925.) Leaflets mostly oblong or oblong-lanceolate, obtuse or acutish, otherwise 

 like the type and intergrading with it. Siskiyou Mountains south in the Sierra Nevada to Mariposa County, 

 California, and western Nevada. 



2. MALUS [Tourn.] Mill. Gard. Diet. Abr. ed. 4. 1754. 



Trees or shrubs, with alternate, toothed or lobed leaves, and showy white or pink 

 flowers in simple terminal cymes. Hypanthium urn-shaped, open, not closed by a cushion. 

 Sepals 5. Petals 5, rounded, clawed. Styles 2-5 (usually 5), united at the base; ovules 2 

 in each cell; carpels papery or leathery. Fruit a pome, usually depressed-globose and 

 hollowed at the base, its flesh not containing grit-cells. [Greek, apple.] 



A genus of about 15 species, natives of the north temperate zone, six of which are in North America. Type 

 species, Pyrus Malus L. 



1. Malus fusca (Raf.) Schneider. Oregon Crab-apple. Fig. 2531. 



Pyrus fusca Raf. Med. Fl. 2: 254. 1830. 



Pyrus diversifolia Bong. Mem. Acad. St.-Petersb. VI. 2: 133. 1832. 



Pyrus rivularis Dougl. ex Hook. Fl. Bor. Amer. 1 : 203. pi. 68. 1833. 



Malus rivularis M. Roem. Fam. Nat. Syn. 3: 215. 1847. 



Malus diversifolia M. Roem. Fam. Nat. Syn. 3: 215. 1847. 



Malus fusca Schneider, Handb. Laubholzk. 1 : 723. 1906. 



Small tree 5-10 m. high, the branches somewhat thorny. Leaves 2-4 cm. long, ovate-lanceo- 

 late, acute or acuminate, occasionally 3-lobed, serrate, darker green and sparsely pubescent above, 

 pale and pubescent or tomentose beneath; inflorescence a simple cyme, the pedicels and hypan- 

 thium tomentose; petals white, 8-10 mm. long, suborbicular ; fruit about 15 mm. long, oblong, 

 depressed at both ends, purplish. 



Moist open woods, Humid Transition Zone; Aleutian Islands, coast region of Alaska, and British Columbia, 

 and west of the Cascade Mountains of Washington and Oregon, reaching its southern limit in Sonoma and 

 Plumas Counties, California. Type locality: Not given. April-June. 



Malus fusca var. levipes (Nutt.) Schneider, Handb. Laubholzk. 1: 724. 1906. Leaves usually less pubes- 

 cent, sometimes glabrous; pedicels and hypanthium glabrous. This is the more common form in the Willamette 

 Valley and along the western slopes of the Cascade Mountains. The typical species is the common form nearer 

 the coast. 



3. AMELANCHIER Medic. Phil. Bot. 1:155. 1789. 



Shrubs or small trees with simple deciduous leaves and unarmed branches. Flowers 

 racemose or rarely solitary, white. Hypanthium campanulate, more or less adnate to the 

 ovary. Sepals 5, narrow, persistent and usually reflexed. Petals 5, ascending. Stamens 

 many; filaments subulate. Styles 2-5, connate, pubescent at the base. Ovary wholly or 

 partly inferior, the cells becoming twice as many as the styles by false partitions intrud- 

 ing from the back. Ovules solitary in each cell, erect. Fruit a berry-like pome, 4-10- 

 celled. [The Savoy name of the Medlar.] 



A genus of about 25 species, natives of the north temperate zone; about twenty are in North America. Type 

 species, Mespilus Amelanchier L. 



Top of ovary and leaves glabrous. 



Styles 3-5; petals 10-15 mm. long. 



Leaves truncate or retuse, rather coarsely crenate-serrate to near the base; inflorescence glabrous. 



1. A. glabra. 



Leaves ovate to oblong-ovate, obtuse to acute, sharply serrate; inflorescence usually sparsely villous- 

 tomentose. 2. A. Cusickii. 



Styles 2 or 3; petals 5 or 6 mm. long. 3. A. Covillei. 



