696 Ericaceae 



4. Menziesia purpurea Maxim. Yoraku-tsutsuji. mm. long; flowers 4-8, umbellate, campanulate, 12-15 mm. 



Shrub with glabrous branchlets; leaves ovate or obovate-ellip- long, rose-purple, usually 4-merous, the pedicels loosely glan- 



tic, 2.5-4.5 cm. long, 1.5-2 cm. wide, obtuse, rarely retuse, en- dular-pilose, 1.5-2.5 cm. long; calyx-lobes glandular-ciliate; 



tire, sparsely ciliate, minutely glandular-hairy on upper side, capsules 3-4 mm. long, short white-hairy while young. 



glaucous and sometimes sparsely glandular-puberulent beneath. Mountains; Kyushu, 

 the midrib beneath loosely appressed-hairy, the petioles 3-6 



4. RHODODENDRON L. Tsutsuji Zoku 



Deciduous or evergreen shrubs or sometimes small trees; leaves alternate, petiolate, entire; flowers pedicellate, usually in 

 terminal umbellike racemes or trusses; calyx 4- to 5(-8)-parted; corolla rotate, campanulate, or infundibuliform, rarely tubular, 

 usually slightly oblique or regular, 4- to 5(-8)-lobed; stamens as many as or twice as many as the corolla-lobes, the anthers 

 usually opening by terminal pores; ovules many; style slender, the stigma capitate; capsules ovoid or oblong, septicidally dehis- 

 cent, 4- to 8-valved; seeds minute, the testa loose and protruding at each end. More than 600 species, in the cooler and 



temperate regions of the N. Hemisphere and in high mountains of the Tropics (one in Australia). 



lA. Leaves and ovary with sessile discoid glandular scales. 

 2A. Leaves 2-8 cm. long. 



3A. Flowers pale greenish yellow; pedicels 1-1.5 cm. long 1. R. keis\ei 



3B. Flowers rose-purple; pedicels 5—10 mm. long. 



4A. Leaves obtuse to subacute, 2-4 cm. long, partly evergreen; flowers 2.5-3.5 cm. across 2. R. dauricum 



4B. Leaves acute to acuminate, 3-7 cm. long, deciduous; flowers 4-5 cm. across Z. R. mucromdatum 



2B. Leaves 1-2 cm. long; flowers rose-purple 4. i?. parvijolium 



IB. Leaves and ovary without sessile glandular scales. 



5A. Leaves evergreen, thick-coriaceous, glabrous or lanate beneath, not strigose. 

 6A. Bud-scales deciduous. 



7A. Leaves rounded to shallowly cordate at base, usually glabrous beneath 5. R. brachycarpum 



7B. Leaves acute at base, usually densely rusty-tomentose beneath 6. R. metternichii 



6B. Bud-scales persistent. 



8A. Leaves thickly brown-tomentose beneath, linear-oblanceolate, 10-15 cm. long; flowers pale rose; erect shrub. .. T. R. makinoi 



8B. Leaves glabrous beneath, obovate-oblong, 3-5 cm. long; flowers pale greenish yellow; prostrate shrub i. R. auretim 



5B. Leaves deciduous, usually membranous, rarely partially evergreen, often strigose. 

 9A. Flowers in umbels from nonleaf -forming buds. 



10 A. Flowers solitary from the lateral buds; stamens of unequal length, the 2 upper ones much shorter, densely white-barbate, the 



3 lower ones glabrous, longer; petioles glandular-pilose 9. R. semibarbatum 



lOB. Flowers 1 to several from a terminal bud. 



IIA. Flowers campanulate, nodding or pendulous; leaves obovate or oblong 10. i?. nipponicum 



11 B. Flowers infundibuliform, ascending or horizontal. 

 12A. Flowers and young vegetative shoots terminal. 



13 A. Branchlets strigose; leaves sometimes semi-evergreen, alternate. 

 14 A. Corolla white, pilose inside, tubular, the lobes spreading, small. 



15A. Corolla tubular-campanulate, short-pubescent outside; anthers longitudinally dehiscent; ovary 3-locular. 



1 1 . i?. tsusiophyllum 

 153. Corolla short-tubular to infundibuliform-campanulate, glabrous outside; anthers opening by pores; ovary 4- to 



5-locular 12. i?. tschonos\ii 



14B. Corolla usually colored, glabrous inside, infundibuliform, large, 1.5-6 cm. across. 

 16 A. Bud-scales not viscid; calyx and pedicels without glandular hairs. 



17A. Leaves glabrescent, coriaceous and often evergreen; flowers rose-colored, glabrous \3>. R. tashiroi 



17B. Leaves strigose or long-hairy, deciduous or sometimes partially evergreen. 



18A. Leaves glabrous beneath except on midrib; flowers solitary, terminal; corolla about 1.5 cm. across. 



14. R. serpyllijolium 

 18B. Leaves pilose beneath; corolla 2-6 cm. across. 

 1 9A. Flowers with the leaves in June and July. 



20A. Leaves lanceolate, acute; stamens 5; anthers dark purple r 15. i?. indicum 



20B. Leaves elliptic (summer leaves obovate) ; stamens 9 or fewer; anthers light in color, not dark purple. 



16. R. tamtirae 

 19B. Flowers with or before the leaves in April and May. 



21A. Stamens 6-9; flowers rose-purple; leaves deciduous 17. i?. kprniyaniae 



21B. Stamens 5(-8). 



22A. Leaves usually lanceolate, acute, semi-evergreen; flowers rose-purple, 2—3 cm. across. . . 18. i?. tosaense 

 22B. Leaves ovate, elliptic, or obovate. 



23A. Flowers 4-5 cm. across, red; branches erect or ascending 19. iJ. kaempjeri 



23B. Flowers 2-3 cm. across, rose-purple; branches spreading 20. R. kjusianum 



16B. Bud-scales viscid, at least on the inner side; calyx and pedicels with glandular hairs. 

 24A. Young branches and leaves appressed-strigose. 



25A. Calyx-lobes appressed-hairy, subacute; leaves not coriaceous, mostly deciduous; flowers rose-purple, fragrant. 



2 1 . i?. yedoense var. pou\hanense 



25B. Calyx-lobes glandular-ciliate, obtuse; leaves coriaceous, deep green and lustrous above, evergreen; flowers red, 



inodorous 22. R. scabrum 



