Ulmaceae 



381 



lA. Leaves 2-5 cm. long, 1-2 cm. wide, with simple rather obtuse teclh; samara 8-13 mm. long; flowers in autumn in leaf-axils; perianth 



deeply lobed 1 . f. parvijoUa 



IB. Leaves 3-13 cm. long, 2-7 cm. wide, with usually acute, sometimes double teeth; flowers precocious, before the leaves; perianth shal- 

 lowly lobed. 



2A. Seeds on upper portion of the samara; leaves unlobed, the petioles 4-12 mm. long 2. V. davidiana var. japonica 



2B. Seeds at the center of the samara; leaves usually shallowly 3- to 5-(-9) lobed above, the petioles 3-5 mm. long 3. C/. laciniata 



1. Ulmus parvifolia Jacq. U. sieboldii Daveau; U. shira- 



sawana Daveau Aki-nire. Small much-branched tree 



with puberulent branches; leaves rather firm, lustrous, ob- 

 liquely oblong, obovate or narrowly ovate, 2-5 cm. long, 1-2 

 cm. wide, obtuse to acute, obliquely obtuse at base, simply 

 toothed, glabrous except puberulent on the midrib above, 

 with 7 to 15 pairs of lateral nerves, the petioles 4-12 mm. long; 

 samaras ellipdc or nearly orbicular, short-pedicellate, glabrous, 



8-13 mm. long, the seed near the center. Sept. Honshu 



(centr. distr. and westw.), Shikoku, Kyushu. Korea, For- 

 mosa, and China. 



2. Ulmus davidiana Planch, var. japonica (Rehd.) 

 Nakai. V. campestris sensu auct. Japon., non L.; U. campes- 

 iris var. japonica Rehd.; V. japonica Sarg., non Sieb.; U. pro- 



pinqua Koidz. Haru-nire, Nire. Deciduous tree with 



densely rusty-pubescent branches; leaves obovate, sometimes 

 narrowly so, or elliptic, 3-10 cm. long, 2-6 cm. wide, doubly- 

 toothed, abruptly acimiinate, usually obliquely cuneate-obtuse 

 at base, scabrous above, pilose beneath at least on nerves, with 

 7-13 pairs of lateral nerves, the petioles 4-12 mm. long; sam- 



aras obovate, glabrous, 10-16 mm. long, the seeds on upper 



portion close to the base of style. Apr.-June. Hokkaido, 



Honshu, Shikoku, Kyushu; rare. Forma suberosa Nakai 



has corky branches. Forma kijimae (Makino) Sugimoto. 



U. kjjimae Makino Tsukushi-nire. Leaves glabrous. 



Kyushu. The typical variety occurs in Sakhalin, s. Kuriles, 



Korea, e. Siberia, and n. China. 

 3. Ulmus laciniata (Trautv.) Mayr. U. montana var. 



laciniata Trautv. Ohyo, Atsuni, Atsushi. Tree with 



pale brown branches puberulous when young; leaves rather 

 thin, obovate to broadly obovate-cuneate, 8-13 cm. long, 5-7 

 cm. wide, usually shallowly 3- to 9-lobed toward the tip, ab- 

 ruptly acuminate, obtuse or cuneately narrowed to an obtuse 

 base, acutely double-toothed, scabrous and short appressed- 

 puberulent above, pilose beneath, with 10 to 17 pairs of lateral 

 nerves; samaras elUptic, glabrous, about 15 mm. long, the seed 

 nearly at the center.- May-June. Temperate forests; Hok- 

 kaido, Honshu, Kyushu. Korea, n. China, e. Siberia, and 



Kamchatka. 



2. ZELKOVA Spach Keyaki Zoku 



Deciduous trees or shrubs; leaves short-petiolate, alternate, stipulate, penninerved, simple-toothed; flowers polygamous, 4- to 

 5-merous, short-pedicelled, the staminate in the lower, the bisexual ones in the upper axils of young branchlets; stamens 4-5; 



style lateral; drupe short-pedicelled, small, oblique, usually rather flattened, the cotyledons broad. Few species in e. and w. 



Asia. 



1. Zelkova serrata (Thunb.) Makino. Corchorus ser- 

 ratus Thunb.; Ulmus \ea\ii Sieb.; Planera acuminata Lindl.; 



Z. acuminata (Lindl.) Planch.; Z. \eakii (Sieb.) Maxim. 



Keyaki. Tall tree with gray-brown smooth bark and much 

 divided slender branches, the branchlets brownish red, puberu- 

 lent, the lateral ones deciduous in autumn; leaves membra- 

 nous, narrowly ovate or narrowly ovate-oblong, 3-7 cm. long 

 (sometimes to 12 cm. long in young vigorous shoots), 1-2.5 

 (-5) cm. wide, long-acuminate, shallowly cordate to rounded 

 at base, slightly scabrous or nearly smooth and dull above. 



acutely mucronate-toothed, thinly pilose on nerves beneath 

 while young, the petioles 1-3 mm. long, puberulous on upper 

 side; fruit sessile, nerved, about 5 mm. across, obliquely ovate- 

 orbicular, glabrous. Apr.-May. Lowlands and mountains; 



Honshu, Shikoku, Kyushu; frequently planted around houses. 



Korea, China, and perhaps Formosa. 



Var. stipulacea Makino. .' Zel\ova schneideriana Hand.- 



Mazz. Me-geyaki. Leaves pilose on both surfaces. 



Honshu. 



3. TREMA Lour. Urajiro-enoki Zoku 



Shrubs or trees; leaves alternate, rather thin, serrulate, palnaately 3- to 7-nerved, the stipules lateral, free, deciduous; flowers 

 unisexual or polygamous, small, in small axillary cymes, 4- to 5-merous; stamens erect in bud; ovary sessile; style terminal, bifid, 

 the stigma lobes linear; ovules pendulous; drupe small, erect, ovoid to nearly globose, with thick endocarp, the endosperm fleshy, 

 the embryo curved. About 20 species in the Tropics and subtropics. 



lA. Leaves whitish and densely sericeous-pubescent beneath. 

 1 B. Leaves green beneath 



. 1. T. orientalis 

 2. T. cannabina 



1. Trema orientalis (L.) Bl. Celtis orientalis L.; Sponia 



orientalis (L.) Planch. Urajiro-enoki. Small tree with 



densely appressed-pilose elongate branches; leaves narrowly 

 ovate-oblong to broadly lanceolate, 7-15 cm. long, 1.5-5 cm. 

 wide, gradually acuminate, obliquely cordate at base, obtusely 

 serrulate, scaberulous and appressed short-hairy above, white 

 and densely silky-pubescent beneath, palmately 3- to 5-nerved, 

 the petioles 8-12 mm. long; cymes longer or shorter than the 

 petioles, rather many-flowered; fruit ovoid-globose, black, 3-4 



mm. across. Kyushu (lowlands in Yakushima and Tancga- 



shima). Ryukyus, Formosa, s. China to India, Malaysia, 



and Australia. 

 2. Trema cannabina Lour. Celtis amboincnsis Willd.; 



T. amboinensis (Willd.) Bl.; T. virgata Bl. Kiri-enoki. 



Closely resembles die preceding; leaves green, glabrous to 



hirsute beneath. Kyushu (s. distr. to Tanegashima and 



Yakushima). Ryukyus, Formosa, s. China, Malaysia, India, 



and Australia. 



