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Mature leaves with caudate tip; many flowers with more than 5 petals; petals sturdy and with undulations; pedicel sturdy . . . . . . . . . . . . . . . . . . 21 21. Flowers fragrant; stigma lower than stamens; sepals clearly serrated; fully opened flowers often with a pinkish shade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 'Ariake' or 'Senriko' Flowers fragrant; flower diameter more than 5 cm; tree broadly spreading; sepals occasionally with a few teeth; fully opened flowers pure white and hanging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'Shirotae' Flowers somewhat fragrant; flower diameter 4.04.5 cm; style with stigma as long as the stamens; sepals occasionally with a few teeth; fully opened flowers white; petals with irregular undulations and fringes at the tip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'Washi-no-o' 22. Mature leaves with velvety pubescence . . . . . . . . . . . . . . . . . . . . . . . . . 'Takasago' Not like that . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 23. Tree shape narrow and erect, corymbs standing upwards . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'Ama-no-gawa' Not like that . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 24. Flowers cream-yellowish or yellowish green . . . . . . . . . . . . . . . . . . . . . . . . . 'Ukon' Flowers white or pink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 25. Pedicel, calyx, and sepals remarkably purplish red or red-brown . . . . . . . . . . . . . 26 Not like that . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 26. Flowers usually with one pistil; 515 petals slightly emarginate at the top; sepals occasionally with a few teeth; leaves obovate; vigorous growth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 'Taoyame' Flowers occasionally with accessory pistils; 1415 petals entire at the top; sepals unserrated; leaves narrow and oval; weak growth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'Horinji' (rare) 27. All (or almost all) flowers with one perfect pistil . . . . . . . . . . . . . . . . . . . . . . . . . . 28 More than half the flowers with either two perfect pistils, or one or two (partly) phylloid pistils (open at least 10 flowers to check this) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 28. Flower diameter large, more than ca . 4.8 cm . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Flower diameter medium-sized, ca . 3.54.8 cm . . . . . . . . . . . . . . . . . . . . . . . . . .33 29. Flowers with 1014 petals, cup-shaped, white with slight pinkish