610 



ACERACEAE 



parallel, the petioles 1-1.5 cm. long; inflorescence nearly gla- 

 brous, racemose, pendulous, loosely few to rather many-flow- 

 ered, 5-8 cm. long, on short peduncles, the pedicels 1-2.5 cm. 

 long in fruit; flowers pale green, 1-1.2 cm. across; sepals 4, 

 narrowly elliptic, long-pubescent, 5-6 mm. long; petals in 

 pistillate flowers narrowly ovate, about as long as the sepals, 

 often absent in staminate flowers; stamens 5-6; samaras soon 



glabrous, ascending, 2.5-3 cm. long inclusive of the wing. 



Valleys and ravines in mountains; Hokkaido, Honshu, Shi- 

 koku, Kyushu; common. 



13. Acer crataegifolium Sieb. & Zucc. Uri-kaede, 

 Me-uri-no-ki. Large dioecious shrub with glabrous branches; 

 leaves ovate or broadly so, undivided or shallowly 3-fid near 

 the base, 4-7 cm. long, 3-4 (-7) cm. wide, long-acuminate, 

 shallowly cordate at base, rather irregularly toothed, short 

 rusty brown pubescent while young, paler beneath, the peti- 

 oles glabrous, 1-2 cm. long; inflorescence a glabrous raceme 

 3-5 cm. long, about 10-flowered, the peduncles 1-1.5 cm. long, 

 the pedicels slender, 4-10 mm. long; flowers yellowish green, 

 about 8 mm. across; sepals narrowly oblong, ascending, about 

 4 mm. long; petals spathulate-obovate, slightly longer than the 

 sepals; stamens about 8, about one-half as long as the sepals; 

 samaras glabrous, horizontally spreading to ascending, about 



2 cm. long. May. Woods and thickets in low mountains; 



Honshu, Shikoku, Kyushu; common. 



14. Acer capillipes Maxim. Hoso-e-kaede. Tree, gla- 

 brous except the branches and leaves which are rusty-brown 

 crisped-pubescent while young; leaves thick-chartaceous, ovate 

 to broadly so, 3-angled, undivided or shallowly 3-fid and 5- 

 angled, 8-13 cm. long, 4-6(-10) cm. wide, long-acuminate, 

 cordate or rounded at base, irregularly and acutely serrulate, 

 often glaucescent beneath, the lateral lobes if present small, the 

 petioles 3-5 cm. long; inflorescence racemose, densely many- 

 flowered, about 10 cm. long, on short peduncles, the pedicels 

 4-8 mm. long, ascending; flowers pale green, 7-8 mm. across; 

 sepals 5, narrowly oblong, 3-4 mm. long; petals and stamens 

 equaling the sepals; samaras glabrous, nearly horizontally 



spreading, about 15 mm. long. May-June. Mountains; 



Honshu (Kan to Distr. and westw.), Shikoku, Kyushu. 



Var. morifolium (Koidz.) Hatus. A. morijoUum Koidz.; 



A. insulare sensu Ohwi, pro parte, non Makino Yaku- 



SHiMA-oGARAEANA. Leaves broadly ovate, without axillary 

 tufts of hairs on the under surface. Kyushu (Yakushima) . 



15. Acer rufinerve Sieb. & Zucc. Uri-hada-kaede. Tree 

 with greenish glabrous branches; leaves rather thick, flabel- 

 lately 5-angled, 8-15 cm. long and as wide, shallowly 3-fid on 

 upper part, with the central lobes broadly deltoid, acuminate, 

 the lateral lobes acuminate, ascending, smaller, often with an 

 accessory smaller obsolete lobe on the outer side near the base, 

 sharply double-serrulate, the blade shallowly cordate to 

 rounded at base, with rusty brown long pubescence on the 

 nerves beneath while young; inflorescence a rather densely 

 many-flowered raceme, short-pedunculate, 5-10 cm. long, the 

 pedicels rather erect, 2-5 mm. long, rusty-brown pubescent; 

 flowers pale green, 8-10 mm. across; sepals 4, oblong, as long 

 as to slightly shorter than the petals; stamens about 8; samaras 

 ascending, 2.5-3 cm. long. Woods and thickets in moun- 

 tains; Honshu, Shikoku, Kyushu; common. 



16. Acer argutum Maxim. Asa-no-ha-kaede. Small 

 dioecious tree with white-puberulent branchlets; leaves orbicu- 

 lar, thin-membranous, palmately 5(-7)-lobed, cordate at base, 

 5-10 cm. long and as wide, white-puberulent at first beneath. 



persistent on the nerves, the lobes broadly ovate, caudately 

 acuminate, rather regularly double-toothed, the petioles 3-10 

 cm. long, slender; inflorescence a few-flowered raceme, 3-6 

 cm. long, thinly white-puberulent, the pedicels ascending, gla- 

 brous, about 3 mm. long; petals short; stamens about 4, longer 

 than the sepals; samaras glabrous, nearly horizontally spread- 

 ing, 2-2.5 cm. long. May-June. Mountains; Honshu 



(Kanto Distr. to s. Kinki Distr.), Shikoku. 



17. Acer tschonoskii Maxim. Mine-kaede. Shrub 

 or small tree with glabrous branches; leaves 5-angled, nearly 

 orbicular, 5-9 cm. long, 5-10 cm. wide, cordate to nearly 

 rounded at base, while young rusty-brown pubescent beneath, 

 on nerves near base, and on petioles, soon glabrous, palmately 

 5-lobed on outer half, the lobes rhomboid to rhombic-ovate, 

 long-acuminate, often with a short lobe on each side near base, 

 incised and doubly serrate, the petiole glabrous, 2-5 cm. long, 

 reddish; inflorescence loosely few-flowered, short-pedunculate, 

 2-5 cm. long, slightly rusty-brown pubescent on the nodes, the 

 pedicels ascending, 8-15 mm. long; flowers 8-10 mm. across, 

 pale yellow; sepals and petals nearly alike, spreading, linear- 

 oblanceolate, about 4 mm. long; stamens about 8, as long as 

 the petals; samaras glabrous, ascending to obliquely spreading, 



2.5-3 cm. long. June-July. Coniferous forests to the lower 



alpine regions; Hokkaido, Honshu (centr. distr. and northw.). 

 s. Kuriles. 



18. Acer micranthum Sieb. & Zucc. Ko-mine-kaede. 

 Small tree or shrub with glabrous branches; leaves nearly 

 orbicular, 5-8 cm. long and as wide, palmately 5-lobed, beyond 

 the middle, cordate at the base, with rusty-brown curled 

 puberulence on nerves beneath while young, the lobes rhombic- 

 ovate to ovate, caudately long-acuminate, incised and doubly 

 serrate, the petioles 3-5 cm. long, glabrous; inflorescence a 

 rather dense, more than 10-flowered raceme, 4-7 cm. long, on 

 short peduncles, brownish pubescent on the nodes, the pedicels 

 4-7 mm. long, spreading to ascending; flowers small, about 4 

 mm. across, pale green; sepals oblong, about 1 mm. long; 

 petals oblong, about 2 mm. long; stamens 8, as long as the 

 petals; samaras glabrous, nearly horizontally spreading, 1.5-2 

 cm. long. Mountains; Honshu, Shikoku, Kyushu. 



19. Acer diabolicum Bl. A. purpurascens Fr. & Sav.; 



A. diabolicum var. purpurascens (Fr. & Sav.) Rehd. Kaji- 



KAEDE, Oni-momiji. Dioecious tree, the branches grayish, 

 lenticellate, white-pilosulous when young; leaves orbicular, 

 depressed-cordate, 7-15 cm. long, 8-16 cm. wide, 5-lobed, 

 sometimes to the middle, glabrous on upper side, pilosulous 

 beneath, truncate to shallowly cordate at base, the terminal 

 lobe ovate, 5-angled, shallowly 3-iid on upper part, abruptly 

 acuminate with an obtuse tip, with few obtuse coarse teeth, 

 the outermost pair of lobes very short and small; inflorescence 

 a loose few-flowered, sessile corymb, 2-5 cm. long, glabrate, 

 the pedicels 1-2 cm. long, nearly erect; flowers 5-merous, pale 

 green; sepals and petals similar, oblong, suberect, 5-6 mm. 

 long; stamens 8; samaras appressed-pilosulous, erect or slightly 



ascending, 3-4 cm. long. Apr .-May. Mountains; Honshu, 



Shikoku, Kyushu. 



20. Acer pycnanthum K. Koch. A. rubrum sensu auct. 

 Japon., non L.; A. rubrum var. pycnanthum (K. Koch) Ma- 

 kino Hana-no-ki, Hana-kaede. Tree, the branches gla- 

 brous, the nodes sparsely rusty-brown pubescent while young; 

 leaves ovate to orbicular, 3-fid, 4-7 cm. long, 3-6(-8) cm. wide, 

 rounded to shallowly cordate at base, glabrous, deep green on 

 upper side, glaucous beneath, the lobes 3-angled or ovate-tri- 



