Aceraceae; Hippocastanaceae; Sapindaceae 



611 



angular, acuminate, irregularly serrate, the petioles glabrous, 

 3-6 cm. long; inflorescence fasciculate, few-flowered, from 

 lateral winter-buds developing before the leaves, the pedicels 

 elongate, glabrous, to 5 cm. long, pendulous; sepals of pistillate 

 flowers 5, broadly lanceolate to narrowly ovate, about 3 mm. 

 long, reddish; petals smaller; samaras glabrous, about 2 cm. 

 long, nearly erect. Apr. Wet places in mountains; Hon- 

 shu (w. part of Tokaido and Shinano); rare; sometimes 

 planted. 



21. Acer nikoense Maxim. A. maximowiczianum Miq. 

 e.K Koidz.; Negundo nikoense (Maxim.) Nichols., non Miq. 



Mecusuri-no-ki. Tree, coarsely grayish spreading-hirsute 



on young branches, under side of leaves, pedicels, and petioles; 

 leaves 3-foliolate, the petioles 2-3 cm. long, the lateral leaflets 

 sessile, narrowly ovate to narrowly elliptic, 5-12 cm. long, 2-6 

 cm. wide, acute with an obtuse tip, slightly oblique at base, 

 remotely obtuse-serrate except near base or subentire, glabrous 

 on upper side when mature, glaucescent beneath, the 10-15 

 pairs of lateral nerves parallel, the terminal leaflet on a 

 petiolule 5-10 mm. long; inflorescence about 3-flowered in a 

 terminal fascicle; die pedicels 1-1.5 cm. long; sepals 5, as 

 long as the petals; stamens about 10; samaras large, yellowish 



villous, ascending to obliquely spreading, 4-5 cm. long. 



May. Mountains; Honshu, Shikoku, Kyushu. 



22. Acer cissifoHum (Sieb. & Zucc.) K. Koch. Negundo 

 cissifolium Sieb. & Zucc; N. nikoense Miq. Mitsude-kaede. 



Dioecious tree, white-puberulent on young branches; leaves 

 3-foliolate, the leaflets nearly all alike, on petiolulcs 5-10 mm. 

 long, rather thinly membranous, ovate-elliptic or oblong, 5-8 

 cm. long, 2-3.5 cm. wide, caudately long-acuminate, cuncatc 

 at base, coarsely acute-serrate on upper half, tliinly white ap- 

 pressed-puberulent especially on the nerves beneath, and with 

 axillary tufts of white hairs, the lateral nerves 10-12 pairs; 

 inflorescence racemose, pendulous, loosely white-pubescent, the 

 racemes 4-15 cm. long, on peduncles 2-4 cm. long, the pedicels 

 spreading to ascending, 4-6 mm. long; flowers small, about 5 

 mm. across, 4-merous; sepals about 1 mm. long; petals about 

 2.5 mm. long; stamens 4, slightly shorter than the petals, the 

 filaments broadened at base; samaras glabrous or short-puberu- 

 lent while young, nearly erect to ascending, 2.5-3 cm. long. 



Apr .-May. Mountains; Hokkaido, Honshu, Shikoku, 



Kyushu. 

 23. Acer negundo L. Negundo aceroides Moench; A. 



jauriei Lev. & Van't. Tonerikoba-no-kaede. Dioecious 



tree with glabrous branches; leaves pinnately 3- to 5(-7)-folio- 

 late, on petioles 5-8 cm. long, the leaflets ovate-elliptic, 5-10 

 cm. long, acuminate, coarsely serrate, glabrous or slightly 

 pubescent beneath; staminate flowers in corymbs, the pistillate 

 in racemes; ovary pubescent; samaras glabrous, ascending, 2.5- 



3.5 cm. long. Apr. Widely cultivated in our area. N. 



America. 



Fam. 125. HIPPOCASTANACEAE Tochi-no-ki Ka Horsechestnut Family 



Trees and shrubs with palmately or pinnately compound, exstipulate, opposite leaves; flowers polygamous, zygomorphic, in 

 terminal panicles; sepals 4 or 5, free or connate, imbricate in bud; petals 4 or 5, unequal, clawed; stamens 5-9, free; disc on 

 outer side of the stamens; ovary superior, 3-locular, with 2 ovules in each locule; style and stigma simple; fruit usually 1-locular, 



3-valved, dehiscent, usually 1-seeded; seeds large, with a large hilum, the endosperm absent. Two genera, with about 25 



species, in the temperate regions of the N. Hemisphere and S. America. 



1. AESCULUS L. TocHi-No-Ki Zoku 



Deciduous trees or shrubs, with large sometimes resinous winter-buds; leaves long-petiolate, palmately 5- to 9-foliolate, serrate; 



flowers many, in erect terminal panicles; calyx campanulate or tubular, with 4 or 5 teeth; petals long-clawed at base. About 



24 species, in Europe, e. Asia, India, and N. America. 



1. Aesculus turbinata Bl. A. dissimilis Bl. Tochi- 



No-Ki. Tree, with rusty-brown, long, curled, soft hairs 

 while young, soon glabrate, the buds ovoid, resinous; leaves 5- 

 to 7-foliolate, the leaflets narrowly obovate-oblong, the median 

 largest, 20-35 cm. long, about 12 cm. wide, abrupdy acuminate, 

 gradually narrowed from above the middle to the sessile base, 

 obtusely toothed, pubescent on nerves and in axils beneath, the 

 lateral nerves about 20 pairs; inflorescence erect, narrow, 15-25 

 cm. long, 6-10 cm. across, with short spreading pubescence; 

 flowers pinkish, rather dense, on one side of the panicle 



branches, numerous, about 1.5 cm. across, the pedicels 3-5 mm. 

 long; calyx-teeth 5, unequal, depressed-rounded; petals 4, re- 

 curved, on a short claw, pubescent; stamens exserted, 15-17 

 mm. long, arcuate; fruit obovoid-globose, about 3 cm. across, 3- 

 valved, dehiscent; seeds chestnut-brown, lustrous, the hilum 



occupying about half of the surface of the seed. May-June. 



Mountains, especially in ravines; Hokkaido, Honshu, Shikoku, 



Kyushu; common. Forma pubescens (Rehd.) Ohwi. A. 



turbinata var. pubescens Rehd. Urage-tochi-no-ki. Leaves 



soft-pubescent beneath. 



Fam. 126. SAPINDACEAE Mukuroji Ka Soapberry Family 



Trees, rarely herbs; leaves alternate or opposite, usually odd-pinnate, sometimes bipinnate or ternate, exstipulate; flowers uni- 

 se.xual or polygamous, actinomorphic or zygomorphic, small, usually in panicles; sepals 4 or 5, imbricate in bud, rarely valvate; 

 petals 4 or 5, rarely absent, usually hairy or scaled near the base within; disc prominent, on outer side of the stamens; stamens 

 usually 8 or 10 in 2 cycles, rarely 6 or 7, more or less connate below; ovary superior, usually 3-locular, deeply 3-lobed, the ovules 



usually solitary in each locule; style simple; fruit a capsule, berry, drupe, nut, or a samara; seeds without endosperm. About 



120 genera, with about 1,000 species, chiefly in the Tropics, a few in temperate regions. 



IA. Leaflets entire; flowers small, actinomorphic; fruit bcrrylikc 1. Sapindus 



IB. Leaflets toothed or pinnately lobcd; flowers zygomorphic, rather large; fruit a capsule 2. Koclreuteria 



