702 



Ericaceae 



dense brown-pubescent; flowers rose-purple, the pedicels 8-12 

 mm. long, with glandless and glandular hairs; corolla 3-4 cm. 

 across; stamens 10, glabrous; style glandular on lower half; 

 ovary densely pale brown-hairy; capsules short-cylindric, ob- 

 lique, 1-1.2 cm. long, brown-hairy.- May. Mountains; 



Honshu (centr. and n. distr.). 



36. Rhododendron lagopus Nakai. R. wadanum var. 

 lagopus (Nakai) Hara Daisen-mitsuba-tsutsuji. De- 

 ciduous rather high shrub, with glabrous branches; leaves in 

 3's, terminal, broadly rhombic, 3-6.5 cm. long, 2-5 cm. wide, 

 acute, cuneate at base, pubescent only while young, the hairs 

 persistent on midrib beneath; flowers solitary, rose-purple, the 

 pedicels about 1 cm. long; calyx minute; corolla about 4 cm. 

 across; stamens 10, glabrous; styles glabrous; ovary densely 

 white-villous; capsules shordy ovoid-cylindric, 1-1.3 cm. long, 



oblique at base, brown-pilose. ^Mountains; Honshu (centr. 



distr. and westw.), Shikoku. 



37. Rhododendron quinquefolium Biss. & Moore. 

 GoYO-TsuTsuji, Shieo-yashio. Large deciduous shrub 4-6 

 m. high, with much-branched slender glabrous branches; 

 leaves membranous, in 5's, terminal, obovate-elliptic or rhom- 

 bic-elliptic, obtuse, mucronate, usually reddish, ciliate or 

 ciliolate, cuneate below, short white-pilose especially on the 

 midrib above and below, the petioles 1-3 mm. long; flowers 

 white, the pedicels glabrous to brown-pilose, sometimes loosely 

 glandular-pilose, 1.5-2.5 cm. long; calyx-lobes lanceolate to del- 

 toid, sometimes white-pilose, 1.5-3 mm. long; corolla 3-4 cm. 

 across; stamens 10, the filaments white-pilose on lower half; 

 styles glabrous or soft-pilose near base; ovary glabrous, some- 

 times scattered soft-pilose; capsules ovoid- to oblong-cylindric, 

 1-1.5 cm. long, 3.5-5 mm. across, with minute external warts. 

 ^May-June. Mountains; Honshu, Shikoku. 



38. Rhododendron pentaphyllum Maxim. R. quinque- 

 folium var. roseum Rehd. Akebono-tsutsuji. Branched 



shrub 3-4 m. high, with glabrous branchlets; leaves rather 

 firm, elliptic, 2.5-4.5 cm. long, 1.7-2.5 cm. wide, acute at both 

 ends, mucronulate, ciliate, loosely callose hairy on upper side, 

 glabrous or with loose glandular hairs on midrib and near base 

 beneath, green on both sides, the petioles 2-5 mm. long, loosely 

 long-hispid on margin; flowers deep rose-colored, the pedicels 

 1-1.5 cm. long, glabrous; corolla about 5 cm. across; stamens 

 10, glabrous; styles and ovary glabrous; capsules narrowly ob- 

 long, 12-15 (-20) mm. long, 5-7 mm. across. Apr .-May. 



Mountains; Honshu (Kii Prov. and westw.), Shikoku, Kyu- 

 shu. 



Var. nikoense Komatsu. R. ni\oense (Komatsu) Nakai; 



R. pentaphyllum var. villosum Koidz. Aka-yashio, Akagi- 



TsuTsuji. Pedicels glandular; five of the filaments pilose on 

 lower portion. Honshu (Iwaki Prov. and westw.), Shi- 

 koku, Kyushu. 



39. Rhododendron albrechtii Maxim. Mukasaki-ya- 

 SHio, Miyama-tsutsuji. Deciduous shrub 1-2 m. high, with 



rather slender, glandular-pilose branchlets; leaves relatively 

 thin, mosdy clustered near the ends of the branchlets, obovate 

 to broadly lanceolate, 5-10 cm. long, acute to obtuse or 

 rounded at the tip, with short thickened hairs on upper side 

 and on margin, rarely glaucescent, die nerves beneath loosely 

 glandular-pilose while young, the midrib spreading-pilose; 

 flowers 3-6, terminal, deep rose to rose-purple, 3-4 cm. across, 

 the pedicels 1-2 cm. long, densely long glandular-hairy; calyx 

 minute, 5-toothed; corolla white-pubescent on the upper side 

 within; stamens 10, usually densely white-pubescent near the 

 base, styles glabrous; capsules ovoid, 8-12 mm. in diameter. 



^May-June. Mountains; Hokkaido, Honshu (Echizen and 



northw.). 



40. Rhododendron japonicum (A. Gray) Suring. Aza- 

 lea japonica A. Gray; R. japonicum. var. glaucophyllum Hara; 



A. mollis var. glabrior Regel; R. glabrius (Kegel) Nakai 



Renge-tsutsuji. Deciduous shrub 1-2 m. high, with rather 

 slender, loosely pilose branchlets; leaves membranous, oblan- 

 ceolate, 5-10 cm. long, 1.5-3 cm. wide, obtuse, sometimes acute 

 or rounded and mucronate, narrowed gradually toward the 

 base, vivid-green above, sparingly ciliate, often glaucous and 

 minutely puberulent on the nerves beneath, loosely pilose on 

 both sides, the petioles 3-7 mm. long; flowers 2-8, terminal, 

 with the leaves, the pedicels 1.5-3 cm. long, often minutely 

 white-puberulent and long-spreading glandular-hairy; corolla 

 vermilion, orange to clear golden-yellow, 5-6 cm. across, 

 puberulent outside; stamens 5, the filaments white-pilose near 

 the base; styles glabrous; capsules oblong-cylindric, 2-2.5 cm. 



long, short white- and long brown-hairy. Apr.-June. 



Mountains; Hokkaido (sw. distr.), Honshu, Shikoku, Kyushu; 

 locally common and gregarious. 



41. Rhododendron camtschaticum Pall. Therorhodion 

 caTntschaticum (Pall.) Small; R. cam-tschaticum var. pallasi- 



anum Komar. Ezo-tsutsuji. Deciduous shrub 10-30 cm. 



high, the young branches loosely coarse-hairy; leaves thin- 

 chartaceous, broadly to oblong-obovate, 2-4 cm. long, 1-2 cm. 

 wide, rounded and mucronate, cuneate, long-ciliate, loosely 

 coarse-pilose on both sides or only on the under side; in- 

 florescence racemose, 1- to 3-flowered, the bracts rather leaflike, 

 green, elliptic to obovate, glandular-pilose, the pedicels 1.5-3 

 cm. long; calyx-lobes narrowly elliptic to broadly lanceolate, 

 3-nerved, rather large; corolla red, slightly tinged with purple, 

 2.5-3.5 cm. across; stamens 10, the filaments densely pilose at 

 the base; style pilose at base; ovary villous; capsules narrowly 



ovoid. July-Aug. Alpine regions; Hokkaido, Honshu 



(Mount Iwate in Rikuchu Prov.). Sakhalin, Ochotsk Sea 



area, Kuriles, Kamchatka, Alaska, and Aleutians. 



Var. barbatum (Nakai) Tatew. Therorhodion camtschati- 

 cum var. barbatum Nakai; R. camtschaticum subsp. intercedens 



Hult. Arage-Ezo-tsutsuji. Very glandular-hairy. 



Hokkaido. 



5. BRYANTHUS Gmel. 



Chishima-tsugazakura Zoku 



Prostrate evergreen much-branched shrub; leaves small, dense, alternate, linear; inflorescence racemose, pedunculate; flowers 

 4-merous, rose-colored, pedicellate; calyx 4-sected; corolla 4-merous, nearly free to the base, half-open; stamens 8, the filaments 

 filiform, glabrous, the anthers not appendaged, opening by pores; style columnar, the stigma 4-lobed; ovary 4-locuIar, subglobose; 

 capsules depressed-globose, coriaceous, septicidally dehiscent, 4-valved; seeds many, ovoid. One species, in Japan and Kam- 

 chatka. 



