ACERACEAE 



609 



sometimes to the middle, sparsely white-pubescent, soon be- 

 coming glabrous except in the axils, or with very sparse 

 persistent pubescence on nerves beneath, the lobes lanceolate, 

 rhombic-lanceolate, or narrowly rhombic-ovate, acuminate, in- 

 cised and doubly serrate acute-toothed, the petioles slender, 2-5 

 cm. long, glabrous or nearly so; inflorescence corymbose, 

 pendulous, more than 10-flowered, on slender peduncles 1.5-4 

 cm. long; flowers pale yellow with a red-purple hue, about 5 

 mm. across; sepals oblong, about 3 mm. long; ovary rather 

 densely white-pubescent; samaras loosely pubescent or gla- 

 brous, the wings ascending, about 2 cm. long including the 



nutlets. May-June. Mountains; Honshu (Kanto Discr. 



and westw.), Shikoku, Kyushu. 



6. Acer ginnala Maxim. A. tatarictim var. ginnala 

 (Maxim.) Maxim.; A. tatarictim var. aidzuense Franch.; A. 



aidzticnse (Fr.) Nakai K.\ra-kogi-kaf.de. Shrub or small 



tree widi glabrous branches; leaves thick-chartaceous, elliptic- 

 ovate, triangular-ovate or ovate, 3-6 cm. wide, often shallowly 

 3-fid, 5-10 cm. long, caudately acuminate with a subobtuse tip, 

 glabrous on upper side, thinly pubescent on nerves beneath, 

 the lateral lobes short, ascending, acute, incised and doubly 

 serrate, the petioles 2-5 cm. long, glabrous; inflorescence 

 loosely branched, compound-corymbose, rather many-flowered, 

 the peduncles 2-3 cm. long, often with scattered sessile glands; 

 flowers greenish yellow, small; sepals about 2.5 mm. long; 

 samaras glabrous or nearly so, erect or slightly ascending, the 

 wings 25-35 mm. long.- May. Wet places; Hokkaido, Hon- 

 shu, Shikoku, Kyushu. Korea, Manchuria, and e. Siberia. 



7. Acer mono Maxim. A. pictum Thunb. 1784, non 

 Thunb. 1783; A. picttim var. mono (Maxim.) Maxim.; A. 

 laettim var. parviflonim Regel; A. pictum var. parviftortim 



(Regel) C. K. Schn. It.iya-kaede. Tree, usually with 



glabrous branches; leaves depressed-orbicular, 7-15 cm. wide, 

 deeply to rather shallowly 5- to 7-lobed, cordate to somewhat 

 truncate at base, usually glabrous on upper side, short-pubes- 

 cent to glabrous except for the axillary tufts of hairs beneath, 

 the lobes deltoid to lanceolate, entire or with few coarse teeth, 

 acuminate and awn-tipped, the petioles 4-12 cm. long, glabrous 

 to short-pubescent; inflorescence on short peduncles, corym- 

 bose, 4-6 cm. across; flowers yellowish green, small, 5-7 mm. 

 across; sepals oblong; petals broadly oblanceolate; samaras 

 glabrous or short-pubescent while young, nearly erect to 



ascending, 2-3 cm. long inclusive of the wing. Apr.-May. 



Mountains; Hokkaido, Honshu, Shikoku, Kyushu; rather 

 common and very variable. Korea, Manchuria, Amur, Sa- 

 khalin, and China. 



Var. mayrii (Schwerin) Koidz. ex Nemoto. A. mayrii 



Schwerin; A. pictum var. mayrii (Schwerin) Henry Aka- 



iTAYA, Beni-itaya. Bark smooth; leaves reddish while young, 

 depressed reniform-orbicular, shallowly 5-lobed, glabrous, the 

 lobes short, broad; flowers larger; samaras often erect. Hok- 

 kaido, Honshu (n. distr.). 



8. Acer miyabei Maxim. A. s/iibatae 'Nakal; A. miyabci 



var. shibatac (Nakai) Hara Kurobi-itaya. Tree, the 



branches grayish white, sometimes short-pubescent while 

 young; leaves depressed, 5-angled, 8-15 cm. wide, 5-lobed, 

 often beyond the middle, cordate at base, short-pubescent 

 on both sides especially on nerves, the lobes 5-angled, caudate- 

 acuminate with an obtuse rip, usually with a small obtuse lob- 

 ule on each side near the middle, the petioles 4-15 cm. long, 

 pubescent with spreading, short hairs; inflorescence panicu- 

 lately corymbose on short peduncles with 10 or more flowers; 

 flowers greenish yellow, about 8 mm. across; sepals oblong, 



about 4 mm. long; petals as long as the sepals, linear-oblanceo- 

 late; stamens slightiy exserted; samaras usually yellowish 



pubescent, horizontally spreading, 2-3 cm. long. May. 



Hokkaido, Honshu (centr. distr. and northw.) ; rare. 



9. Acer distylum Sieb. & Zucc. Hitotsuba-kaede, Ma- 

 RUBA-KAEDE. Tree, the branches with pale brown crisped ap- 

 pressed hairs; leaves simple, ovate-cordate, 10-17 cm. long, 6-12 

 cm. wide, abruptly caudate-acuminate with an obtuse tip, 

 deeply cordate at base, glabrous on upper side, rusty-pubescent 

 beneath while young, appressed and obtusely toothed, the peti- 

 oles 3-5 cm. long, appressed-pubescent while young; inflores- 

 cence pendulous, racemose, with short branches on lower part, 

 7-10 cm. long inclusive of the peduncles 3-5 cm. long, pale 

 brown appressed-pubescent, the pedicels to 1 cm. long; flowers 

 yellowish, 3-4 mm. across; sepals oblong, appressed-pubescent 

 externally; petals as long as the sepals, oblanceolate; stamens 

 longer than the sepals; samaras nearly erect to ascending, pale 



brown-villous while young, about 3 cm. long. June. 



Mountains; Honshu (Kinki Distr. and eastw.), Kyushu. 



10. Acer ukurunduense Trautv. & Mey. A. dedyle 

 Maxim.; A. spicattim var. u\urundticnsc (Trautv. & Mey.) 

 Maxim.; A. caudattim var. ukjirunduense (Trautv. & Mey.) 



Rehd. Ogarabana, Hozaki-kaede. Tree, the branches 



yellowish puberulent; leaves orbicular and 5-angled, 8-13 cm. 

 long, 8-15 cm. wide, cordate at base, often whitish and with 

 dull yellowish pubescence beneath, palmately 5(-7)-lobed on 

 outer third, the lobes ovate-triangular, acuminate, sharply 

 serrate and incised, the petioles 6-12 cm. long; inflorescence 

 an erect raceme, 10-15 cm. long inclusive of the peduncles 3-5 

 cm. long, densely many-flowered, with pale brown soft hairs, 

 the pedicels about 10 mm. long; flowers yellowish; sepals 

 broadly lanceolate, about 1 mm. long; petals narrowly oblance- 

 olate, about 2 mm. long; samaras loosely short-pubescent or 



glabrous, ascending, 1.5-2 cm. long. July-Aug. High 



mountains; Hokkaido, Honshu (centr. distr. and northw.), 



Shikoku. Sakhalin, Korea, Manchuria, e. Siberia, and Ku- 



riles. Forma pilosum Nakai. Usuge-ogarabana. Leaves 



less prominently pubescent beneath. Occurs with the spe- 

 cies. 



11. Acer nipponicum Hara. ./. parrifiorum Fr. & Sav., 

 non Ehrh.; A. peniisylvanictim subsp. pari'iflortim (Fr. & Sav.) 



Wessmael; A. brevilobum Hesse Tetsu-kaede. Tree, 



the young branches rusty-brown soft pubescent; leaves large, 

 rather thin, cordate, 5-angled, depressed, 10-15 cm. long, 12-20 

 cm. wide, glabrous or nearly so on upper side, often thinly 

 rusty brown curled-pubescent, persistently so on tlie nerves 

 beneath, shallowly 5-lobed, the lobes broadly deltoid, often 

 shallowly 3-fid, sharply double-serrate, acuminate, the petioles 

 8-17 cm. long, with persistent sparse brown pubescence on 

 upper part; inflorescence erect, rather densely many-flowered, 

 10-20 cm. long, on a short peduncle 1-1.5 cm. long, short- 

 branched in lower part, densely rusty-brown pubescent, the 

 pedicels spreading, 4-7 mm. long; flowers 3—4 mm. across; 

 sepals ovate, 1 mm. long; petals small; stamens 3 mm. long; 

 samaras ascending to obliquely spreading, rusty brown pubes- 

 cent, 3.5-4 cm. long. June-July. Mountains; Honshu, Shi- 

 koku, Kyushu; rare. 



12. Acer carpinifolium Sieb. & Zucc. Chidori-no-ki. 

 Dioecious tree with glabrous branches; leaves thin, ovate- 

 oblong, 8-15 cm. long, 3.5-7 cm. wide, acuminate, cordate or 

 shallowly so at base, regularly and sharply double-serrate, 

 short-pubescent, often with long persistent appressed hairs on 

 nerves beneath, the 18-23 pairs of lateral nerves ascending- 



