362 



Salicaceae 



broadly so, 4-8 cm. long, 3-7 cm. wide, acute to abruptly 

 acute, serrate, deep green, with a small gland on each side of 

 the rounded to broadly cuneate base, sUghtly glaucous beneath 

 and white-pubescent while young; aments precocious, the 

 staminate 4-7 cm. long, 8-10 mm. across, stamens 5-7; the 



pistillate 5-8 cm. long, about 7 mm. across. Apr.-May. 



Mountains; Hokkaido, Honshu, Shikoku, Kyushu. 



3. Populus alba L. Urajiro-hako-yanagi, Hakuyo, 

 GiN-DORO. Deciduous tree; branches and bud-scales white- 

 woolly while young; leaf-blades ovate, elliptic or narrowly so, 

 4-10 cm. long, acute to obtuse, rounded to shallowly cordate 

 at base, sinuately toothed or incised, deep green above, densely 

 white-woolly beneath; pistillate aments about 5 cm. long; 



staminate flowers with 6-10 stamens. Sometimes cultivated 



in Japan, native of Europe and centr. Asia. 



4. Populus maximowiczii Henry. P. suaveolens var. 

 latijolia Gombocz; P. suaveolens sensu auct. Japon., non Fisch. 



DoRo-YANAGi, DoRO-NO-Ki, DoRO. Dcciduous tree with 



thick branches, the branchlets at first pubescent, grayish; 

 leaves subcoriaceous, ovate, elliptic or oblong, sometimes 



broadly ovate, 6-10 cm. long, abruptly short-acuminate, obtuse 

 to shallowly cordate at base, obtusely serrulate, deep green 

 above, puberulous on the nerves and whitish beneath, the 

 petioles 1-4 cm. long, puberulous; staminate aments 5-10 cm. 

 long, the stamens rather numerous; pistillate aments elongate 

 after flowering; capsules rather loosely arranged, nearly ses- 

 sile. Apr.-June. Sunny fluvial plains and riverbanks; 



Hokkaido, Honshu (centr. distr. and northw.). Korea, 



Manchuria, Ussuri, Amur, Sakhalin, and Kamchatka. 



The following are poorly known and reported to occur in 

 Hokkaido: 



(1) Populus jesoensis Nakai. Ezo-yama-narashi. 

 Plant glabrous; leaves larger and with longer petioles than in 

 P. sieboldii Miq. 



(2) Populus davidiana Dode. Chosen-yama-narashi. 

 Leaves smaller than in P. jesoensis Nakai and without glands 

 at base of blade. Korea, Manchuria, and Ussuri. 



(3) Populus koreana Rehd. Chirimen-doro. Young 

 branches glabrous, viscid; nerves of leaves impressed above. 



2. CHOSENIA Nakai Kesho-yanagi Zoku 



Deciduous dioecious tree; buds provided with a single bud-scale; leaves relatively narrow, alternate, petiolate, usually serrate, 

 sometimes entire, the stipules absent; flowers precocious, anemophilous; staminate aments pendulous, the bracts thinly mem- 

 branous, adnate at base to the filaments; stamens 5, slighdy unequal, the filaments filiform, the anthers 2-locular; pistillate aments 

 pendulous, the bracts thinly membranous, caducous, hairy; ovary 1, l-locular, stipitate; capsules 2-valved, the ovules 4, the endo- 

 sperm absent. A single species, in e. Asia. 



1. Chosenia arbutifolia (Pall.) B. V. Skvortz. Sdix 

 arbutifolia Pall.; C. bracteosa (Turcz.) Nakai; Salix macrolepis 

 Turcz., pro parte; C. macrolepis (Turcz.) Komar.; S. 

 splendida Nakai; C. splendida (Nakai) Nakai; S. bracteosa 

 Turcz. Kesho-yanagi. Upright deciduous tree; branch- 

 lets glabrous, usually glaucous, sometimes reddish; leaves with 

 glaucous petioles 2-5 (-7) mm. long, the blades oblanceolate or 

 oblong-lanceolate, 6-8 cm. long, 1-2 cm. wide, obscurely ser- 

 rate or sometimes entire, acute at both ends, quite glabrous. 



rather thick; staminate aments 1-2.5 cm. long, 4-5 nun. in 

 diameter, the axis glabrous, the bracts 3- to 5-nerved, broadly 

 ovate, about 2.5 mm. long, obtuse, loosely hairy on back; pistil- 

 late aments 1-2 cm. long in flower, 4-5 cm. long in fruit, the 

 bracts caducous; ovary glabrous, stipitate, the styles 2, free, 



jointed above, the stigma bifid, lobes linear. Alluvial plains; 



Hokkaido, Honshu (Kamikochi in Shinano) ; locally abun- 

 dant. Korea, Sakhalin, e. Siberia, and the area surrounding 



the Ochotsk Sea. 



3. TOISUSU Kimura Oba-yanagi Zoku 



Deciduous dioecious trees with a single overlapping bud-scale, the margins free; leaves narrowly ovate, usually serrate, alter- 

 nate, stipulate in vigorous shoots; aments cylindric, pendulous in anthesis, the pistillate bracts deciduous; flowers entomophilous, 

 the staminate with 2 dorsi-ventral glands and 5-10 stamens, the pistillate with a gland on each side; ovary stipitate, the styles 



2, free or connate to the middle, the stigmas bifid, slender, becoming deciduous with the upper part of the style; ovules 4. 



Few species in e. Asia. 



1. Toisusu urbaniana (Seemen) Kimura. Salix cardio- 

 phylla sensu auct. Japon., non Trautv. & Mey.; S. urbaniana 



Seemen; T. cardiophylla var. urbaniana (Seemen) Kimura 



Oba-yanagi. Tree; branchlets dark reddish brown, sparsely 

 short-pubescent while young; leaves narrowly ovate to broadly 

 lanceolate, 5-13 cm. long, 1-4.5 cm. wide, acuminate, minutely 

 serrate, obmse to rounded or sometimes shallowly cordate at 

 the base, fulvous especially on the underside when young, 

 short-puberulous on the midrib above, glabrescent in age, 

 glaucous beneath; aments appearing with the leaves, terminal 

 on short leafy spurs, pendulous, 5-10 cm. long, the staminate 

 densely flowered, about 8 mm. across, the bracts broadly ovate, 



4. SALIX L. 



obtuse, ciliate, densely silky on lower half, the pistillate elon- 

 gate, to 10 cm. long; ovary densely grayish white-pubescent. 



May-June. Hokkaido, Honshu (centr. distr. and 



northw.) . Kuriles. 



Var. schneideri (Miyabe & Kudo) Kimura. Salix urba- 

 niana var. schneideri Miyabe & Kudo Tokachi-yanagi. 



Ovary glabrous. Hokkaido, Honshu (n. distr.). Sakha- 

 lin. 



X Toisochosenia kamikochica (Kimura) Kimura. Salix 



\ami\ochica Kimura Kamikochi-yanagi. A bigeneric 



hybrid of Chosenia arbutifolia X Toisusu urbaniana. Occurs 

 with the parents. 



Yanagi Zoku 



Usually deciduous, dioecious trees or shrubs; leaves alternate, rarely subopposite, petiolate or sessile, lanceolate, sometimes 

 rounded-cordate, entire to serrate, those on vigorous young shoots often stipulate; aments appearing before or with the leaves; 

 flowers solitary in the axils of bracts, with 1 or 2 glands; staminate flowers with 1-12, usually 2, stamens, the filaments elongate 

 sometimes united below; ovary soUtary, 2 carpellate, sessile or stipitate, the style slender or absent, the stigmas 2, each usually 



