20 THE AZALEAS OF THE OLD WORLD 



Style glabrous. 



Flowers more than 2.5 cm. across; leaves elliptic to elliptic-oblong or 



oblong-obovate, from 2 to 5 cm. long R. Simsii, p. 45. 



Flowers less than 2.5 cm. across. 



Leaves lanceolate, acuminate R. atrovirens, p. 50. 



Leaves oval to oblanceolate, 1 cm. or less long . R. Nakaharai, p. 54. 

 Corolla with short, rarely long, cylindric tube and spreading lobes; stamens 5, 



rarely 4. 



Style villose at base; flowers white to rose-color . . . R. Seniavinii, p. 57. 

 Style glabrous. 

 Leaves persistent; flowers 5-partite. 



Corolla rose-purple, leaves not conspicuously dimorphic, oval to 



lanceolate R. microphytum, p. 57. 



Corolla lilac-colored, with a long tube; leaves conspicuously dimorphic, 

 lanceolate or elliptic to oblong-obovate . . . . R. Mariae, p. 58. 

 Leaves deciduous; flowers white, 4 to 5 partite; leaves narrow-lanceolate 

 to ovate-lanceolate or oblong-obovate, often prominently 3-nerved 



R. Tschonoskii, p. 55. 

 Bud-scales viscid on inner surface; corolla wide funnel-form; calyx-lobes green, 



ample; style glabrous. 

 Shoots densely clothed with flattened, appressed hairs; leaves conspicuously 



dimorphic; stamens 10. 

 Leaves persistent, calyx-lobes glandular-ciliate. 



Corolla scarlet to rose-red; calyx-lobes oval to lanceolate; leaves sub- 



crenulate, coriaceous R. scabrum, p. 59. 



Corolla rose-purple to magenta; calyx-lobes lanceolate; leaves entire, 



subcoriaceous R. phoeniceum, p. 61. 



Leaves deciduous or semipersistent, obscurely crenate-serrate, veins im- 

 pressed above; corolla rose to rose-purple, fragrant, often double; calyx- 

 lobes lanceolate, not glandular R. yedoense, p. 64. 



Shoots with few appressed, flattened hairs and many spreading, pilose often 



glandular hairs. 

 Stamens 8 to 10; leaves persistent or semipersistent, not conspicuously 



dimorphic. 

 Corolla red, not viscid; stamens 10; ovary glandular; leaves not viscid 



beneath R. Oldhamii, p. 66. 



Corolla white or pale-purple, viscid outside; stamens 8 to 10; ovary gland- 

 less; leaves viscid beneath R. mucronatum, p. 68. 



Stamens 5; leaves deciduous or semipersistent, lanceolate to oblanceolate- 

 ovate or linear-lanceolate; corolla pink to pale rosy purple, viscid without, 

 funnel-form or divided into linear segments; ovary glandular 



R. linearifolium, p. 74. 



SECT. II. SCIADORHODION REHD. & WILS. 



Leaves broadest below the middle; stamens nearly equal. 



Leaves ovate; corolla pale lilac-purple; stamens 8 to 10; fruit conic-ovoid on 



a curved pedicel R. Farrerce, p. 79. 



Leaves ovate to ovate-lanceolate; corolla rose-color; stamens 10; fruit short- 



cylindric, erect R. Mariesii, p. 80. 



Leaves broadest about or above the middle. 

 Leaves rhombic; fruit cylindric. 

 Stamens subequal; corolla red, rotate-funnel-form; style villose 



R. Weyrichii, p. 82. 



