Ericaceae 



699 



10. Rhododendron nipponicum Matsum. Azalea nip- 



ponica (Matsum.) Copel. Oba-tsutsuji. Deciduous 



shrub 1-2 m. higli, with red-brown, peeling, lustrous bark, the 

 branches thick, glandular-pilose while young; leaves alternate, 

 membranous, obovate or oblong, 5-12 cm. long, 3-6 cm. wide, 

 cuneate and sessile or nearly so at base, densely spreading 

 ciliate, coarsely pilose and often somewhat glandular-hairy; 

 flowers few, white, in terminal umbels, the pedicels 1.5-2 

 cm. long, glandular-pilose; calyx-lobes 5, ovate, obtuse; corolla 

 5-lobed, tubular-campanulate, 1.5-2 cm. long, nodding, short- 

 pubescent inside at base; stamens 10, scarcely exserted; style 

 1-1.5 cm. long, rarely glandular; capsules oblong-ovoid, 

 oblique, glandular-pilose, about 1 cm. long, 5-6 mm. wide. 



July-Aug. Mountains; Honshu (n. and Hokuriku 



distr.) ; rather rare. 



11. Rhododendron tsusiophyUum Sugimoto. R. tana- 

 \ae (Maxim.) Ohvvi, non Hayata; TsusiophyUum tana\ae 

 Maxim. Hakone-kome-tsutsuji. Prostrate or decum- 

 bent, much-branched shrub to 0.5 m. high, the branches 

 densely brown-strigose; leaves rather thick, nearly sessile, ellip- 

 tic to narrowly so, sometimes obovate, 7-10 mm. long, 4-6 

 mm. wide, acute at both ends, mucronulate, brown-strigose on 

 upper side, on margins and midrib beneath; flowers 1-3, white, 

 umbellate, the pedicels densely brown-strigose, 1-3 mm. long; 

 calyx minute; corolla shallowly 4- or 5-lobed, tubular-campanu- 

 late, 7-10 mm. long, white-puberulent externally; stamens 5, 

 included, the filaments pilose, the anthers longitudinally de- 

 hiscent; style glabrous; ovary 3-locular, densely strigose; cap- 

 sules broadly ovoid. June-July. Mountains; Honshu (Sa- 



gami, Izu, Musashi, and Suruga Prov.) ; rare. 



12. Rhododendron tschonoskii Maxim. R. tschonoskji 

 var. lypicum forma pentamcrum Makino and forma tetra- 

 meriim Makino Kome-tsutsuji. Densely branched de- 

 ciduous shrub, the branches, leaves, pedicels and capsules stri- 

 gose; leaves ovate, oblong, or elliptic, 7-25 mm. long, 4-12 

 mm. wide, acute to subacute at both ends, sessile or subsessile; 

 flowers 2-5, white, terminal, the pedicels 3-8 mm. long; corolla 

 short-tubular to infundibuliform-campanulate, 6-8 mm. long, 

 5-10 mm. across, glabrous, but puberulent inside at the base, 

 the lobes 4 or 5, sometimes shorter than the tube; stamens 4 or 

 5, slighdy exserted, the filaments pubescent at base; style 2-10 

 mm. long; ovary 4- or 5-locular; capsules ovoid-conical, obtuse, 



4-5 mm. long, 3-4 mm. across. July. Rocky places in 



mountains; Hokkaido, Honshu, Shikoku, Kyushu. Korea 



(Mount Chiisan). 



Var. trinerve (Franch.) Makino. R. trinerve Franch. 



0-KOME-TsuTsuji. Slighdy larger in all parts; leaves oblong 

 to broadly oblanceolate, 1.5-4.5 cm. long, 7-15 mm. wide, with 

 1 (rarely 2) pair of prominent lateral nerves; corolla 7-10 mm. 

 long, 7-12 mm. across; stamens longer than the style; styles 

 7-10 mm. long, glabrous or brownish strigose near base; cap- 

 sules ovoid, 4-5 mm. in diameter, brownish strigose. July- 

 Aug. Honshu (n. and Hokuriku distr.). 



13. Rhododendron tashiroi Maxim. Sakura-tsutsuji. 

 Evergreen or partially deciduous erect shrub, the branches, 

 petioles, pedicels, and ovary strigose; leaves rather thick, in 

 3's (rarely 2's), terminal on the branches, elliptic, oblong, ob- 

 ovate, or sometimes ovate, deep green and lustrous on upper 

 side, acute at both ends, long appressed-pubescent on upper 

 side while young, the hairs somewhat persistent beneath, the 

 pedoles 5-10 mm. long; flowers 2 or 3, rose-colored, terminal, 

 in umbels, the pedicels 1-2 cm. long; calyx small, obsoletely 



5-lobed; corolla 5-lobed, infundibuliform, 3.5-4 cm. across, 

 glabrous, spotted inside at tip; stamens 10, glabrous; styles 

 glabrous, exserted, about 2.5 cm. long; capsules ovoid-oblong, 



oblique, 10-12 mm. long. Thickets and woods in hills and 



mountains; Kyushu (s. distr.). Ryukyus and Formosa. 



14. Rhododendron serpyllifoHum (A. Gray) Miq. 

 Azalea serpyllijolia A. Gray Unzen-tsutsuji. Much- 

 branched deciduous small shrub, the branches, leaves, and 

 capsules purple-brown strigose; leaves alternate, mostly clus- 

 tered toward die dp of the branchlets, broadly lanceolate, 8-15 

 (-20) mm. long, 3-6 mm. wide, obtuse to acute, narrowed at 

 base, glabrous beneath except the strigose midrib, strigose on 

 the upper surface, the petioles to 2 mm. long; flowers solitary, 

 red to nearly white, terminal, the pedicels 2-3 mm. long; 

 calyx 5-toothed; corolla about 1.5 cm. across, infundibuliform, 

 glabrous; stamens 5, the filaments granular-pilose in the lower 

 part; styles glabrous, 1.5-2 cm. long, long-exserted; capsules 



short-pedicelled, ovoid, about 4 mm. in diameter. Apr.- 



May. Mountains; Honshu (Kanto Distr. and westw.), Shi- 

 koku, Kyushu. 



15. Rhododendron indicum (L.) Sweet. Azalea indica 

 L.; A. indica var. lateritia Lindl.; R. lateritium (Lindl.) 



Planch.; R. indicum var. lateritium (Lindl.) DC. Satsuki- 



TsuTsuji, Satsuki. Semi-evergreen or deciduous, red-brown 

 strigose, much-branched shrub to 1 m. high; leaves often 

 clustered toward the tip of the branchlets, rather thick, lanceo- 

 late to broadly so, 2-3.5 cm. long, 5-8 (-10) mm. wide, acute, 

 mucronate, acuminate at base, the petioles 1-3 mm. long; 

 flowers 1 or rarely 2, usually red, following the new leaves, 

 the pedicels about 1 cm. long; calyx-lobes 5, ovate-orbicular; 

 corolla 2.5-3.5 cm. across, broadly infundibuliform, glabrous, 

 5-lobed, spotted inside on upper lobes; stamens 5, the fila- 

 ments granular-pilose on lower half, the anthers dark purple; 

 styles glabrous, 3-5 cm. long; capsules ovoid, hairy, 7-8 mm. 



long. June-Aug. Rocks in ravines; Honshu (w. Kanto 



Distr. and westw.), Kyushu. Widely cultivated with numerous 

 cultivars grown in gardens; also extensively used as a parent 

 of hybrids. 



16. Rhododendron tamurae (Makino) Masam. R. in- 

 dicum var. tamurae Makino; R. simsii var. tamurae (Makino) 



Kaneh. & Hatus.; R. eriocarpum Nakai, excl. basionym. 



Maruba-satsuki. Resembles the preceding; plant reddish 

 brown-strigose; vernal leaves mosdy ellipdc, the summer ones 

 obovate, 2-^ cm. long, 8-15 mm. wide, obtuse to rounded or 

 sometimes acute; pedoles 2-8 mm. long; flowers 1-2, red, 

 terminal; pedicels about 1 cm. long; calyx-lobes 5, broadly 

 ovate, 2-3 mm. long; corolla broadly infundibuliform, 3—4 cm. 

 across, 5-lobcd; stamens 9 or fewer, the filaments short-gran- 

 ular, the antheers usually light-colored; styles glabrous; cap- 

 sules 7-10 mm. long, densely long-hairy, narrowly ovoid. 



June-July. Thickets and thin woods in hills and low eleva- 

 tions in the mountains; Kyushu (Southern islands including 

 Yakushima and Tanegashima). 



17. Rhododendron komiyatnae Makino. Ashi-taka- 

 TsuTsuji. Brown-strigose deciduous shrub or small tree to 

 10 m. high; leaves alternate, rather thin, often disposed to- 

 ward the top of the branchlets, broadly lanceolate to narrowly 

 ovate-oblong, 2-3 cm. long, 8-12 mm. wide, acute at both ends, 

 short-petiolate; summer leaves smaller, deciduous the follow- 

 ing spring; flowers 1-3, rose-purple, terminal, in umbels, the 

 pedicels 5-10 mm. long; calyx-lobes ovate, about 2 mm. long; 

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



