KEY TO THE ASIATIC SECTIONS OF THE SUBGENUS 



ANTHODENDRON ENDL. 



Flowers and leaves from the same bud. 



Shoots with flattened, appressed, bristle-like hairs; leaves persistent or some- 

 times deciduous, usually dimorphic, scattered on the branches, elliptic to 

 lanceolate or oblanceolate . . . I. Tsutsutsi. 



Shoots glabrous or villose, without bristle-like hairs; leaves deciduous, not di- 

 morphic, in whorls at the end of the branchlets, scattered only on vigorous 

 shoots, usually rhombic to obovate, rarely ovate . . .II. Sdadorhodion. 

 Flowers from the terminal bud, leaves from lateral buds below. 



Corolla rotate-campanulate; stamens 8 to 10 III. Rhodora. 



Corolla funnel-form; stamens 5 IV. Pentanthera. 



KEY TO THE ASIATIC SPECIES 

 SECT. I. TSUTSUTSI G. DON 



Bud-scales not viscid; shoots densely clothed with flattened, appressed hairs. 

 Corolla funnel-form-campanulate. 

 Stamens 5 (5 to 8 in R. tosaense). 



Style villose at base R. breviperulatum, p. 28. 



Style glabrous at base. 



Leaves linear-lanceolate to lanceolate or oblanceolate. 

 Leaves crenate-dentate; flowers red to rose-red, more than 2.5 cm. 



across R- indicwn, p. 22. 



Leaves entire; flowers lilac-purple, less than 2 cm. across 



R. tosaense, p. 52. 

 Leaves oval or obovate to lanceolate. 



Leaves more than 1 cm. long, the midrib beneath covered with hairs 

 and usually with scattered hairs on the whole under surface 



R. obtusum, p. 29. 

 Leaves 1 cm. to 1 cm. or less long, glabrous beneath, except a few 



brown hairs on the midrib R. serpyllifolium, p. 53. 



Stamens 7 to 10. 

 Style villose at base. 



Leaves narrow-lanceolate to oblanceolate, crenate-dentate; stamens 10 



. R. Kanehirai, p. 28. 



Leaves oval to obovate or lanceolate, entire; stamens 7 to 10. 

 Flowers lilac to magenta; leaves generally elliptic-oblong, acute 



R. subsessile, p. 51. 

 Flowers pink. 



Leaves conspicuously dimorphic, obovate to obovate-oblong, 



abruptly mucronate, 2 to 4.5 cm. long . R. lasiostylum, p. 50. 



Leaves not conspicuously dimorphic, often widest below the middle, 



elliptic-ovate to ovate-oblong or elliptic to elliptic-oblong, 



acute R. rubropilosum, p. 52. 



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