700 



Ericaceae 



stamens 6-9, the filaments loosely granular-pilose on lower half, 

 the anthers light colored; styles glabrous, about 2 cm. long; 



capsules elongate, conical, about 8 mm. long, 3 mm. across. 



May-June. Mountains; Honshu (Suruga). 



18. Rhododendron tosaense Makino. R. miyazawae 



Nakai & Hara. Fuji-tsutsuji, Men-tsutsuji. Brown- 



strigose, semi-evergreen, much-branched shrub 1-2 m. high; 

 leaves rather thin, dimorphic, the vernal ones lanceolate or 

 narrowly oblong, 1.5-3 cm. long, 5-8 mm. wide, acute at 

 both ends, short-petiolate, the summer leaves persistent, ob- 

 lanceolate or broadly linear, 1-3 cm. long, 2-A mm. wide, ab- 

 ruptly acute; flowers 2-3, rose-purple, in umbels, the pedicels 

 3-7 mm. long; calyx-lobes 5, ovate-orbicular, 1-1.5 mm. long; 

 corolla infundibuliform, 2-3 cm. across, 5-lobed, glabrous; 

 stamens 5, the filaments loosely white granular-pilose; style 

 glabrous, 2-2.5 cm. long, longer than the stamens; capsules 



narrowly ovoid, 5-7 mm. long. Apr.-May. Honshu 



(Kinki Distr. and westw.), Shikoku, Kyushu. 



19. Rhododendron kaempferi Planch. R. tndicum var. 

 \aempjeri (Planch.) Maxim.; R. obtusum var. haempjeri 

 (Planch.) Wils. Yama-tsutsuji. Brown-strigose, much- 

 branched shrub 1-3 m. high; leaves alternate, rather thin, the 

 vernal ones elliptic, or sometimes oblong to broadly ovate, 3-5 

 cm. long, 1-2.5 (-3) cm. wide, the summer leaves smaller, 

 narrowly obovate, acute to obtuse at both ends, the petioles 1-4 

 mm. long; flowers 2-3, brick-red, rarely white or purple, 

 terminal, in umbels, the pedicels 5-20 mm. long; calyx-lobes 

 5, small, usually elliptic, 2-4 mm. long; corolla infundibuli- 

 form, 3-4 cm. across, 5-lobed; stamens 5, the filaments sparsely 

 granular-pilose on lower half; styles glabrous; capsules conical. 

 Apr.-May. Sunny slopes in hills and mountains; Hok- 

 kaido, Honshu, Shikoku, Kyushu. Very common and variable. 



Rhododendron obtusum (Lindl.) Planch. Azalea obtusa 

 Lindl. KiRisHiMA-TsuTsuji. Widely cultivated and prob- 

 ably of hybrid origin involving R. \aempjen and several other 

 species. 



20. Rhododendron kiusianum Makino. R. indicum 

 var. amoenum a japonicum Maxim.; R. amoenum var. ja- 

 ponicum (Maxim.) Zabel; R. \aempjeri var. japonicum 

 (Maxim.) Rehd.; R. obtusum forma japonicum (Maxim.) 

 Wils.; (?) R. sataense Nakai; R. indicum var. japonicum 



(Maxim.) Makino Miyama-kirishima. Brown-strigose, 



low, much-branched, often prostrate or decumbent shrub 

 about 1 m. high; vernal leaves oblong to elliptic, 8-30 mm. 

 long, acute at both ends, very short-petiolate, the summer 

 leaves smaller, more or less persistent, narrowly obovate- 

 spathulate; flowers 2-3, rose-purple, terminal, in umbels; calyx- 

 lobes 5, short, broadly ovate, 2-3 mm. long; corolla infundi- 

 buliform, 2-3 cm. across, glabrous, 5-lobed; stamens 5, the 

 filaments loosely granular-pilose on lower half or glabrous, 

 the anthers often purplish; capsules ovoid, about 7 mm. in 

 diameter, the pedicels 5-8 mm. long. May. High moun- 

 tains; Kyushu. 



21. Rhododendron yedoense Maxim, var. poukha- 

 nense (Lev.) Nakai. R. pou\hanense Lev.; R. coreanum 



Rehd. Chosen-yama-tsutsuji. Brown-strigose shrub 1-2 



m. high; leaves narrowly oblong or broadly oblanceolate, 3-8 

 cm. long, 1-3 cm. wide, acute at both ends, loosely strigose on 

 upper side, densely so beneath especially on the nerves, the 

 petioles 1-5 mm. long; flowers 2-3, pale rose-purple, terminal, 

 in umbels, the pedicels 7-10 mm. long; calyx 5-lobed, the 

 lobes narrowly ovate, subobtuse to subacute, 4-8 mm. long; 



corolla 5-6 cm. across, infundibuliform, 5-lobed, with deeply 

 colored spots inside on the upper lobes; stamens (7-) 10, the 

 filaments glabrous to papillose-pilose on the lower half, the 

 anthers purplish; styles glabrous or with appressed hairs near 



base; capsules ovoid, 8-10 mm. in diameter, long-pilose. 



Apr.-May. Kyushu (Tsushima). Korea. 



22. Rhododendron scabrum G. Don. R. sublanceo- 

 latum Miq.; Azalea sublanceolata (Miq.) O. Kuntze; R. in- 

 dicum. var. sublanceolatum, (Miq.) Makino Kerama-tsu- 



Tsujr, To-TsuTsuji. Brown-strigose, evergreen branched 

 shrub; leaves rather thick, narrowly elliptic or narrowly ovate- 

 elliptic, 4-10 cm. long, 1.5-3 cm. wide, deep green and lustrous 

 on upper side, acute at both ends, the petioles 5-10 mm. long; 

 flowers 1-4, vermilion, terminal, in umbels, the pedicels 1-2 

 cm. long; calyx-lobes 5, elliptic, 3-6 mm. long, long glandular- 

 ciliate, obtuse to rounded; corolla infundibuliform, 6-7 cm. 

 across, 5-lobed; stamens 10, the filaments granular-pilose at 

 base; capsules hairy, about 1 cm. long. Mar.-Apr. Fre- 

 quently planted in southern Kyushu. Ryukyus. 



23. Rhododendron maerosepalum Maxim. R. lineari- 



folium var. maerosepalum (Maxim.) Makino ^Mochi-tsu- 



Tsuji. Mostly deciduous shrubs about 1 m. high; vernal 



leaves narrowly oblong to elliptic or ovate, 4-7 cm. long, 1-3 

 cm. wide, dull, acute at both ends, with spreading glandless 

 and glandular hairs especially on under side and on the petioles, 

 the petioles 3-7 mm. long; summer leaves sometimes persistent 

 over winter, smaller and oblanceolate, obtuse, the petioles 3-7 

 mm. long; flowers 1-5, pale rose-purple, terminal, the pedicels 

 1.5-3 cm. long, glandular-hairy; calyx-lobes green, linear- 

 lanceolate, acute, 2-3 cm. long, viscid; corolla about 5 cm. 

 across, infundibuliform; stamens 5, the filaments granular- 

 pilose; styles glabrous; capsules ovoid, 1-1.2 cm. in diameter, 



long glandular-pilose. May. Sunny hillsides; Honshu 



(Izu, Kai, and westw. to e. Chugoku Distr.), Shikoku; com- 

 mon and with numerous cultivars grown in gardens. 



Rhododendron X tectum Koidz. Miyako-tsutsuji. 

 Hybrid of R. \aempferi X R. maerosepalum. 



24. Rhododendron ripense Makino. R. mucronatum 

 var. ripense (Makino) Wils. Kishi-tsutsuji. Brown- 

 sometimes glandular-hairy shrub about 1 m. high; vernal 

 leaves lanceolate or oblanceolate, 3-5 cm. long, 8-15 mm. wide, 

 acute at both ends, the summer leaves usually persistent over 

 winter, smaller, oblanceolate, usually subobtuse; flowers 1-3, 

 rose-purple, terminal, in umbels, the pedicels 1-1.5 cm. long; 

 calyx-lobes 5, green, lanceolate, 1-2 cm. long, gradually acute, 

 short glandular-ciliate; corolla infundibuliform, 5-lobed; sta- 

 mens 10, the filaments granular-pilose; styles glabrous; capsules 



ovoid, about 8 mm. in diameter, strigose. Apr.-May. 



Honshu (Chugoku Distr.), Shikoku, Kyushu (n. distr.). 



25. Rhododendron dilatatum Miq. R. reticulatum 



forma pentandrum Wils. Mitsuba-tsutsuji. Deciduous 



nearly glabrous shrub 1-2 m. high, with gray-brown branches; 

 leaves in 3's, terminal on the branchlets, broadly ovate- 

 rhombic, 4-7 cm. long, 3-5 cm. wide, very acute, broadly 

 cuneate to subrounded at base, often minutely glandular- 

 dotted on both sides, glabrous or sparsely hairy on the upper 

 side and on the upper portion of petioles, entire, the petioles 

 5-15 mm. long, often puberulent; flowers 1-3, purplish, termi- 

 nal, before the leaves, the pedicels 5-20 mm. long, rather 

 densely short glandular-hairy; calyx-teeth very short; corolla 

 3-4 cm. across, 5-lobed; stamens 5, the filaments glabrous; 

 styles glabrous; ovary densely glandular-puberulous; capsules 



