討論:南台灣秋海棠

山羊百科，林文智老師的植物、山岳、攝影紀錄

2. Begonia austrotaiwanensis Chen & Peng 南台灣秋海棠

A perennial, deciduous, acaulescent herb, with creeping rhizome; rhizome moniliform, consisting of several ellipsoid to subglobose units each 9-50 mm long, 7-25 mm in diameter, densely covered by persistent stipules, triangular, 7-22 mm long, 4-9 mm wide, acuminate at apex. Leaves with petiole to 40 cm long, 9 mm in diameter, greenish or sometimes reddish; blade obliquely to broadly ovate, 13-38 cm long, 10-32 cm broad, acuminate to cuspidate at apex, unequally cordate at base, but often lobed in adult leaves, irregularly dentate-serrate, green, sometimes with white foveolate spots on upper surface, and sometime broad brown belts along adaxial veins, chartaceous to slightly succulent, venation palmate, the veins 6-9. Bracts caducous, in pairs, narrowly ovate to elliptic, 8-12 mm long, 3.5-6.3 mm broad, acute at apex, serrate, pale green, papery to nearly succulent, glabrous. Inflorescences in androgynous dichasial cymes to 55 cm long arising directly from rhizome; peduncle erect, to 42 cm long, 8 mm in diameter. Flowers of both sexes pinkish, scented. Staminate flowers with tepals 4, decussate, spreading, margin sometimes reflexed, the outer 2 rotund to orbicular, 13-35 mm long, 9-32 mm broad, the inner 2 oblanceolate to narrowly obovate, 10-32 mm log, 6-18 mm broad; stamens 51 to 66, golf club shaped, yellow, the filaments free, 0.9-2.7 mm long, the anther 1.8-2.3 mm long, 0.8-1.2 mm in diameter. Pistillate flower with tepals 3, very rarely 2 or 4, the fourth much reduced when present, the outer 2 opposite, rotund to oblate, 16-23 mm long, 14-37 mm broad, the inner 1 oblancolate to obovate, 12-23 mm long, 7-23 mm broad; styles 2, Y-shaped, 4.2-5.3 mm long, yellow, the base separate to short-connate, 2.1-2.6 mm long, each arm covered with a spiral, papillose stigmatic band; ovary 2-locular, unequally 3-winged, obovoid, white to pale green, glabrous; placentae axile, bilamellate, the lamella forked. Infructescences to 72 cm long, the fruit bearing pediceles 28-47 mm long; mature fruit a dry, trigonous, very unequally 3-winged capsule, the body ellipsoid, 9-15 mm long, 7-8 mm in diameter, the abaxial wing erect, much protruded, narrowly triangular, 27-46 mm long, 9-15 mm broad, the lateral wings much narrower, 2.3-3.5 mm long, 9-14 mm broad. Seeds numerous, narrowly ovoid, 0.39-0.43 mm long, 0.19-0.25 mm in diameter, rounded at apex, constricted at micropylar end, yellowish brown.

Endemic at altitudes between 200 and 1000 m, often growing in moist, shallow soil on steep, rocky slopes and in somewhat shady habitates, presently known only from Kaohsiung County of Taiwan.

KAOHSIUNG: Shanping, Chen 100(Holotype, HAST!); Shanping logging trail, Chen 354; Tona Hot Spring, Chen 638; Tona logging trail, Chen & Peng 381; Tachin Waterfall, Chen 619; Wangshanchiao, Chen 344.