Icacinaceae; Aceraceae 607 



1. Hosiea japonica (Makino) Makino. Natsiattim ja- pedicels 1-2.5 cm. long, about 8 mm. across, pendulous, pale 



potiicum Makino; N. sinense sensu auct. Japon., non Oliv. yellow; calyx-lobes ovate, about 1 mm. long; corolla with a 



KuROTAKi-KAZURA. Dioccious woody climber with grayish short tube at base, the lobes broadly lanceolate, recurved from 



brown, loosely lenticellate, elongate branches, yellowish re- the middle, caudate, papillose inside; filaments erect, about 3 



trorse-pubescent; leaves thin, ovate-cordate, 8-18 cm. long, 5-12 mm. long, slightly longer than the corolla-tube; fruit rather 



cm. wide, acuminate with a mucro or short awn at apex, flat, pendulous, about 1.5 cm. long, elliptic, red, the stone 



cordate to nearly truncate at base, irregularly and coarsely solitary, with raised reticulations on both sides. May-June. 



dentate with short-aristate teeth, pale yellow appressed-pubes- Woods in mountains; Honshu (Chugoku Distr.), Shikoku, 



cent, the lateral nerves and chief veinlets ending in the teeth, Kyushu; rare, 

 the petioles ^-8 cm. long; flowers in axillary cymes, on slender 



Fam. 124. ACERACEAE Kaede Ka Maple Family 



Trees and shrubs, monoecious or sometimes dioecious; leaves simple or compound, opposite, exstipulate; flowers bisexual or 

 unisexual, small, actinomorphic, in terminal or axillary racemes, fascicles, or panicles; sepals 4 or 5, imbricate, rarely connate; 

 petals 4 or 5, imbricate or absent; disc usually flat, rarely absent; stamens 4-10; ovary superior, 2-locular, 2-lobed; style simple, 

 the stigma 2-fid; ovules 2 in each locule; fruit a pair of 1-seeded, broadly winged samaras, separating at maturity; seeds without 

 endosperm, the testa thin. Two genera, with about 100 species, chiefly in the temperate regions of the N. Hemisphere. 



1. ACER L. Kaede Zoku 



Deciduous or rarely evergreen trees or shrubs; leaves simple with palmately or rarely pinnately arranged nerves, or 3- to 7- 

 foliolate flowers 5- or rarely 4-merous, in racemes, fascicles, panicles, or corymbs; disc usually annular and prominent, rarely 

 absent; stamens 4-10, usually 8; styles or stigmas 2. Nearly 100 species, in Eurasia, n. Africa, and N. America. 



1 .\. Leaves simple 



2.\. Inflorescence terminal on young leafy branches. 



3A. Inflorescence a corymb or panicle, sometimes racemelike with short branches on lower part. 

 4A. Inflorescence corymbose or paniculate with short axis. 

 5A. Leaves distinctly toothed. 

 6A. Leaves palmately lobed. 



7A. Petioles and peduncles pubescent at least while young. 



8A. Flowers yellowish with scabrous anthers; petioles Yz to nearly as long as the leaves; leaves finely toothed. 



\. A. sieboldianum 

 8B. Flowers purplish with smooth anthers; petioles /4-J^ as long as the leaves; leaves incised-toothed. 2. A. japoniciim 

 7B. Petioles and peduncles glabrous from the first. 



9A. Leaves thinly chartaceous, glabrous or nearly so; ovary glabrous or thinly pubescent. 



lOA. Leaves 9- to I3-lobed, cordate-rounded, slighdy depressed 3. //. shirasawanum 



lOB. Leaves 5- to 7 (-9)-Iobed, cordate-rounded ^. A. palmatiim 



9B. Leaves nearly membranous, usually loosely white-pilose on nerves beneath 5. /J. tetiiii/oUiim 



6B. Leaves undivided or shallowly 3-lobed with short lateral lobes 6. A. ginnala 



5B. Leaves entire or with few coarse teeth. 



11 A. Lobes of leaf acuminate with a short awned tip, glabrous or pubescent; ovary and fruit glabrous 7. A. mono 



I IB. Lobes of leaf elongate with an obtuse tip, pubescent on both sides, ovary and fruit pubescent i. A. miyabei 



4B. Inflorescence a raccmclike panicle with elongate axis. 



12A. Leaves undivided, orbicular-cordate or broadly ovate, with appressed short teeth 9. A. distyltim 



12B. Leaves palmately lobed, sharply toothed. 



13A. Leaves irregularly and coarsely toothed; samara 1.5-2 cm. long, short-pubescent \Q. A. ul^urundiiensc 



I3B. Leaves finely and sharply toothed; samara 3-4 cm. long, with rusty brown, dusty puberulence W. A. nipponicum 



3B. Inflorescence a raceme with elongate axis. 



14A. Leaves undivided, penninervcd with about 20 pairs of closely parallel lateral nerves 12. A. carpinijolium 



14B. Leaves lobed, if undivided, with less than 10 pairs of lateral nerves. 



15A. Leaves of fertile branches ovate or ovate-triangular, with or without a small lateral lobe on each side. 



16A. Leaves 3-6 cm. long; petioles 1-3 cm. long 13. A. cralaegijolitim 



16B. Leaves 8-12 cm. long; petioles 3-6 cm. long. 



17A. Pedicels 5-10 mm. long; leaves glabrous or nearly so beneath, ovate or ovate-triangular, if 3-lobed, the lateral lobes 



near the base \'\. A. capiilipes 



I7B. Pedicels 2-4 cm. long; leaves rusty brown-pubescent when young, 3-lobcd with lateral lobes on the upper part. 



1 5. A. riifineyve 

 I5B. Leaves of fertile branches palmately 5- to 9-lobcd. 



ISA. Leaves softly white-pubescent beneath; flowers 4-merous 16. A. argiitiim 



I8B. Leaves glabrous or rusty brown-pubescent on nerves or on axils beneath. 



I9A. Racemes about lO-fiowcrcd; pedicels 8-15 mm. long; petals and stamens about 4 mm. long \7. A. tschonoskfi 



I9B. Racemes about 20-flowered; pedicels 4-6 mm. long; petals and stamens 1.5-2 mm. long 18. .4. micranthum 



2B. Inflorescence from lateral leafless buds precocious. 



