550 



ROSACEAE 



1. Pourthiaea villosa (Thunb.) Decne. Crataegus vil- 

 losa Thunb.; Photinia villosa (Thunb.) DC; Photinia laevis 

 var. villosa (Thunb.) Koidz.; Pourthiaea laevis var. villosa 

 (Thunb.) Koidz.; Photinia villosa var. typica C. K. Schn.; 



Pourthiaea villosa var. typica (C. K. Schn.) Nakai Watage- 



KAMA-TSOKA, O-KAMA-TsuKA. Large shrub; young branches 

 and petioles white-pubescent; leaves chartaceous, broadly obo- 

 vate or narrowly so, 4-12 cm. long, 2-6 cm. wide, abruptly 

 acuminate, cuneate at base, pale green beneath, acutely serru- 

 late, pubescent on both sides while young, often glabrous later, 

 the petioles 2-8 mm. long; inflorescence with dense white 

 woolly pubescence at anthesis, glabrous in fruit, 4-8 cm. across; 

 flowers 7-10 mm. across; calyx-lobes deltoid, obtuse, white- 

 pubescent; petals often softly puberulent on the claw; styles 

 usually 3, villous at base; fruit obovoid, 8-10 mm. long, red. 



terminated by the persistent calyx-lobes. Apr.-May. Low 



mountains and hills; Hokkaido, Honshu, Shikoku, Kyushu; 

 very common and variable.—— Korea and China. 



Var. zollingeri (Decne.) Nakai. Pourthiaea zollingeri 

 Decne.; Photinia villosa var. zollingeri (Decne.) C. K. Schn. 

 Ke-kama-tsuka. Slighdy pubescent; intermediate be- 

 tween the typical phase and the following: 



Var. laevis (Thunb.) Stapf. Myrtus laevis Thunb.; Cra- 

 taegus laevis (Thunb.) Thunb.; Photinia laevis (Thunb.) 

 DC; Photinia villosa var. laevis (Thunb.) Dipp.; Pourthiaea 



laevis (Thunb.) Koidz. Kama-tsuka. Widi rather smaller 



leaves, glabrous except when young; inflorescence glabrous or 



nearly so, rather small, fewer flowered. Occurs with the 



typical phase. 



30. SORBUS L. Nana-kamado Zoku 



Deciduous trees or shrubs; leaves alternate, stipulate, simple to imparipinnate, toothed; inflorescence a compound terminal 

 corymb, the bracts caducous; flowers rather small, white, sometimes pinkish; calyx with an obconical tube, the teeth 5; petals 5, 

 ovate, orbicular, often pubescent inside near the base; stamens 15-20, the filaments subulate; ovary inferior or semisuperior; 

 styles free or connate at base; ovules 2 in each locule, ascending; pome 2- to 5-locular, small, with 1 or 2 seeds in each locule, 

 these ellipsoidal to ovoid. About 80 species, in temperate and cold regions of the N. Hemisphere. 



lA. Leaves pinnate; calyx-limb persistent. 



2 A. Branches stout; leaflets usually acuminate, 7-15, usually the median ones largest; stipules rather small, deciduous; inflorescence 

 usually large. 



3A. Leaflets 9-11, chartaceous, slightly lustrous; inflorescence nodding; styles 5 1.5. sambticifoUa 



3B. Leaflets 9-15, membranous to herbaceous, scarcely lustrous. 



4A. Leaflets entire on lower half, vivid green, slightly glaucescent; styles 5 2. 5. matsumurana 



4B. Leaflets toothed near to the base, deep green, scarcely glaucescent; styles 3-4 3. S. commixta 



2B. Branches rather slender; leaflets rounded to acute at apex, 5-11, usually the upper ones largest; stipules often rather large, toothed; 



inflorescence small 4. 5. gracilis 



IB. Leaves simple; calyx-limb deciduous after anthesis. 



5A. Inflorescence and leaves glabrous or nearly so, rarel)' with appressed pubescence on leaves beneath 5. 5. alnijolia 



5B. Inflorescence and leaves beneath densely white-woolly 6. S. japonica 



1. Sorbus sambucifolia (Cham. & Schltdl.) Roem. Py- 3.7-7 cm. long, 1-2 cm. wide, obtuse to abruptly acuminate 



rus sambucifolia Cham. & Schltdl. ^Takane-nana-kamado. with a mucro at apex, vivid green and slightly glaucescent. 



Branching shrub about 2 m. high, the young branches thinly whitish beneath, with ascending to incurved acuminate teeth 



soft-pubescent, those of the 2d year's growth grayish brown; on upper half, the lateral nerves not raised; inflorescence 



leaves 9- or 11-foliolate, the petioles 2-3 cm. long, the leaflets erect, large, many-flowered, 5-8 cm. across; flowers white, 



narrowly ovate to broadly lanceolate, 4-6 cm. long, 1-3 cm. about 1 cm. across; calyx-teeth incurved in fruit, brown-ciliate; 



wide, acuminate, deep green and lustrous, slightly paler be- petals spreading, ovate-orbicular, short-clawed; fruit ellipsoidal 



neath, thinly white-pubescent while young, glabrescent or to globose, red. June-Aug. Mountains to alpine zone; 



quite glabrous on both sides, acutely toothed, the lateral Hokkaido, Honshu (centr. and n. distr.). Forma pseudo- 

 nerves slightly raised beneath; inflorescence 5-7 cm. long, often gracilis (Koidz.) Ohwi. S. matsumurana var. pseudogracilis 



slightly more than 10-flowered, nodding, especially in fruit, Koidz. Nankin-nana-kamado-modoki. With a large 



glabrous or thinly pubescent; flowers white to pinkish, 10-12 toothed stipule subtending the inflorescence. 



mm. across; calyx glabrous, die teeth erect in fruit, cihate; 3. Sorbus commixta Hedl. S. aucuparia var. japonica 



petals ascending, nearly as long as the stamens; fruit elongate- Maxim.; Pyrus americana var. microcarpa Miq.; S. japonica 



globose, red. June-Aug. High mountains; Hokkaido, (Maxim.) Koehne, non Hedl.; Py?-K.r aramcans var. w/o-anZ/ja 



Honshu (centr. and n. distr.); rather common. Kuriles, C. Koch, non Torr. & A. Gray; 5. a«c2(/;aWa sensu auct. Japon., 



Sakhalin, Kamchatka, and Ochotsk Sea region. non L.; ? S. parviflora Hedl.; ? S. micrantha (Fr. & Sav.) 



Var. pseudogracilis C K. Schn. S. pseudogracilis (C. K. Koidz.; ? P. micrantha Fr. & Sav., non Dum. Cours.; S. chi- 



Schn.) Koehne Miyama-nana-kamado. Low dwarf shrub onophylla Nakai; S. pruinosa Koehne; S. heterodonta Koehne 



with scarcely nodding inflorescence; calyx-teeth usually slightly Nana-kamado. Tree with glabrous or thinly pubescent 



incurved above; fruit slightly smaller. Alpine regions of young branchlets; leaves pinnate, 15-20 cm. long, the petioles 



Hokkaido and Honshu (n. and centr. distr.). 3-5 cm. long, glabrous or nearly so, the leaflets 9-15, lanceo- 



2. Sorbus matsumurana (Makino) Koehne. Pyrus ma- late to narrowly ovate-oblong, 3-7 cm. long, 1-2.5 cm. wide, 

 tsumurana Makino; S. sitchensis sensu auct. Japon., non Roem. long-acuminate to acuminate, glabrous or nearly so, pale to 



Urajiro-nana-kamado. Small tree glabrous except for whitish and sometimes slightly pubescent on the midrib be- 



the bud-scales, nodes of leaf-rachises and top of the ovary; neath, with acuminate teeth, the lateral nerves slender; in- 



leaflets 9-13, thickly membranous, oblong to narrowly so, florescence 5-10 cm. across, densely many-flowered, glabrous 



