Ericaceae 



701 



ovoid-cylindric, oblique, 1-1.2 cm. long, about 4 mm. across, 



short-glandular. Apr. Honshu (Kanto, Tokaido, and Kinki 



Distr.). 



26. Rhododendron decandrum Makino. R. dilata- 



tum var. decandrum Makino Tosa-no-mitsuba-tsutsuji. 



Much-branched shrub resembling the preceding species; leaves 

 broadly rhombic, more prominently brown-hairy, glabrescent 

 with age, often short giandular-puberulent on upper side, the 

 pedicels about 1 cm. long; calyx-teeth small, glandular-pilose; 

 stamens 10, the anthers purplish; ovary densely short glandu- 

 lar-pubescent; capsules about 1 cm. long, short glandular- 

 hairy. Mar.-Apr. Honshu (Kinki Distr.), Shikoku, Kyu- 

 shu. Possibly only a geographical variant of the preceding. 



27. Rhododendron viscistylum Nakai. Takakum,\- 

 MiTSUBA-TsuTsuji. Much-branchcd shrub 2-3 m. high, 

 brown-pilose while young, glabrescent; leaves in 3's, terminal 

 on the branchlets, ovate or oblong-ovate, 1.5-4.5 cm. long, 7-13 

 mm. wide, very acute, broadly cuneate at base, whitish and 

 with obscure sessile glands beneath, the petioles 3-5 mm. long; 

 flowers 1-2, purple, the pedicels 5-6 mm. long, giandular- 

 puberulent; calyx-teeth short; stamens 10, unequal, die fila- 

 ments glabrous; ovary ovoid, glandular. June. Mountains; 



Kyushu (southern distr.). 



28. Rhododendron weyrichii Maxim. R. shikpkjanum 



Makino; R. shikp){ianum var. ntidistemon Koidz. On-tso- 



Tsuji, TsuKusHi-AKA-TsuTsuji. Rather large shrub to 5m. 

 high, rusty-brown pubescent while young, glabrescent, the 

 branches purplish; leaves in 3's, terminal on the branches, 

 broadly ovate or ovate-orbicular, sometimes broadly rhombic, 

 3.5-8 cm. long, 2.5-6 cm. wide, acute, broadly cuneate to 

 rounded at base, the petioles 5-10 mm. long; flowers 1-3, red, 

 terminal, before or with the leaves; corolla 4-5 cm. across; 

 stamens usually 10; styles glabrous or hairy near base; cap- 

 sules shortly ovoid-cylindric, about 1 cm. long, often oblique at 

 base. Apr.-May. Honshu (s. Kinki Distr.), Shikoku, Kyu- 

 shu. Korea (Quelpaert Isl.). 



29. Rhododendron sanctum Nakai. Jingu-tsutsuji. 

 Large deciduous rusty-brown pubescent shrub to 5 m. high; 

 leaves usually in 3's, terminal on the branchlets, broadly 

 rhombic to broadly ovate-rhombic, 4-8 cm. long, 3-6 cm. wide, 

 slighdy lustrous and long rusty-brown hairy on upper side, 

 paler and the midrib long-hairy beneath, abruptly acute at both 

 ends or obtuse at base, the petioles 5-10 mm. long; flowers 3-4, 

 deep rose, in umbels, terminal, the pedicels 5-8 mm. long; 

 calyx-teeth small, obsolete; corolla glabrous; stamens 10, the 

 anthers purple-brown; styles glabrous; capsules ovoid-cylindric, 



1-1.5 cm. long, oblique at base, densely brown-pubescent. 



May-June. Mountains; Honshu (Tokaido to s. Kinki Distr.). 



30. Rhododendron amagianum Makino. Azalea ama- 



giana Makino Amaci-tsutsuji. Large deciduous shrub 



to 5 m. high, the branches rather slender, densely white-pubes- 

 cent while young; leaves in 3's, terminal on the branchlets, 

 broadly ovate-rhombic, 5-8 cm. long and as wide, abruptly 

 acute, obtuse to acute at base, with scattered long brown hairs 

 on upper side, rusty-brown appressed-pubescent beneath, espe- 

 cially dense on the midrib, the petioles 5-10 mm. long; flowers 

 2-4, red, the pedicels 6-13 mm. long, densely appressed rusty- 

 brown pubescent; calyx-teeth minute; corolla 5-6 cm. across; 

 stamens 10; styles white-pubescent at base; capsules narrowly 



ovoid-cylindric, 1.5-2 cm. long, densely brown-pilose. July. 



Mountains; Honshu (Izu Prov.). 



31. Rhododendron mayebarae Nakai & Hara. Nanco- 



KU-MiTSUBA-TsuTsujl. Deciduous shrub, the branchlets es- 

 sentially glabrous; leaves rhombic-ovate, glabrous, long-hairy 

 on upper side and on margin only while young, the nerves 

 beneath brown-pubescent while young; flowers before the 

 leaves, purple, the pedicels 1-1.5 cm. long, densely coarse 

 brown-hairy; calyx-teeth obscure; corolla infundibuliform, 

 about 3.5 cm. across, 5-lobcd; stamens usually 10, unequal, the 

 filaments glabrous; ovary ovoid, densely coarse brown-hairy; 

 styles glabrous. Apr.-May. Kyushu. 



32. Rhododendron kiyosumense Makino. Azalea \iyo- 

 sttmeTisis Makino; R. shimidztianum Honda ex Makino & Ne- 



moto KiYosuMi-MiTsuBA-TsuTsuji. Dcciduous shrub; 



branches whorled, slender, glabrous; leaves broadly rhombic, 

 i-6 cm. long, 2-5 cm. wide, abruptly short-acuminate, rounded 

 to broadly cuneate at base, loosely brown-pilose while young; 

 flowers purple, before or with the leaves, the pedicels 1-1.2 

 cm. long, loosely appressed brown-hairy especially on lower 

 part; calyx-teeth minute, ciliate; corolla 3-3.5 cm. across, 

 5-lobed; stamens 10; style glabrous; capsules short-cylindric, 

 oblique, about 10 mm. long, 3-5 mm. wide, brown-strigose. 



Apr.-May. Honshu (s. Kanto and Tokaido to s. Kinki 



Distr.). 



33. Rhododendron nudipes Nakai. R. nagasal^ianum 



Nakai; R. ya\umontajium Masam. Saikoku-mitsuba-tsu- 



Tsuji. Large deciduous shrub; branches glabrous; leaves 

 broadly rhombic, 4-8 cm. long, 3-6 cm. wide, abruptly acute, 

 broadly cuneate at base, long brown-hairy on upper side and 

 below while young soon becoming glabrous, the midrib be- 

 neath and upper portion of petioles persistently pale-brown 

 villous; pcdoles 4-8 mm. long; flowers rose-purple, solitary or 

 in pairs, the pedicels short, 6-10 mm. long, loosely brown- 

 pubescent; calyx minute; corolla 3-4 cm. across; stamens 10; 

 style glabrous; ovary densely pale-brown coarse hairy; cap- 

 sules about 1 cm. long, oblique, narrowly ovoid, coarsely hairy. 



May. Mountains; Honshu (Echigo, n. Shinano, and 



westw.), Kyushu. 



34. Rhododendron reticulatum D. Don. R. rhombictim 



Miq. Koba-no-mitsuba-tsutsuji. Deciduous branched 



shrub; leaves broadly ovate to ovate-rhombic, 4-7 cm. long, 

 2.5^ cm. wide, abruptly acuminate to acute, sometimes 

 rounded at base, long brown-hairy on upper side while young, 

 pale green and pubescent beneath especially on midrib, glabres- 

 cent, the petioles 7-12 mm. long; flowers rose-purple, the pedi- 

 cels 8-12 mm. long, with coarse ascending hairs; calyx-teeth 

 depressed, minute, often obscurely glandular-dotted on margin; 

 corolla 3-4 cm. across; stamens 10, glabrous; styles glabrous; 

 capsules ovoid, 7-10 mm. in diameter, oblique, with ascend- 

 ing coarse brown hairs. Apr.-May. Mountains; Honshu 



(Totomi, Shinano, and westw.), Shikoku, Kyushu. Forma 



albiflorum (Makino) Makino. R. rhombicum var. albiflorum 



Makino; R. sat{awanum Makino Shirobana-kob.a-no-mitsu- 



BA-TsuTsuji. Flowers white. 



Var. ciliatum Nakai. Arage-mitsuba-tsutsuji. Hairs 



more persistent on branches and leaves. Occurs with the 



typical phase. 



35. Rhododendron wadanum Makino. R. glandu- 



listylum Komatsu Tocoku-mitsuba-tsutsuji. Deciduous 



brown-hairy shrub 2^ m. high, with slender nearly glabrous 

 branchlets; leaves broadly ovate-rhombic, 3-6 cm. long, 2-5 

 cm. wide, acute, mucronate, broadly cuneate at base, with long 

 deciduous brown hairs on upper side, whitish and pale brown- 

 pubescent beneath, the petioles short, 2-5 mm. long, rather 



