討論:岩生秋海棠

山羊百科，林文智老師的植物、山岳、攝影紀錄

10. Begonia ravenii Peng & Chen 岩生秋海棠

A perennial stoloniferous herb, with subglobose tuber to 22 mm in diam. Stem succulent, often reddish, to 50 cm in height, 7.3 mm in diam., glabrous; Stolons 4 mm in diam., 35 mm in length, glabrous. Leaves alternate, green, papery to nearly succulent, obliquely ovate, 27 cm long, 18 cm broad. Sparsely minutely scaberulous above, glabrous below, the apex subacute to acuminate, the margin irregularly serrate, the base unequally cordate, often lobed in adult leaves; venation palmate, the veins 6-9; petioles greenish or sometimes reddish, 16 cm long, 55 mm in diam. Cymes axillary, comprising androgynous, dichasial, at full development to 30 cm long, strictly protandrous; peduncles to 17 cm long, erect to pendulous. Staminate flower, tepals 2, pinkish, cordate, 12-22 mm long, 14-20 mm broad, spreading, the margin often slightly reflexed; stamens 20-37, yellow, golf-club shaped, 3.7-4 mm long, the anthers obovoid, 1.2-1.6 mm long, 1-1.1 mm across, the filaments 2-3 mm long. Pistillate flower, tepals 2 (rarely 3), pink to pale purple, suborbicular, 12-15 mm in diam., slightly cordate at base; styles 3, yellow, at their base fused ca. 1.5 mm, the free parts horseshoe-like shaped forked, 2-3 mm long below the arm, each arm covered with a continuous, ca. 2 times papillose stigmatic band; ovary white, obovoid, glabrous, longitudinally shallowly 3-grooved, 3-locular, 3-winged; placentae axile, bilamellate. Fruit winged capsule, the fruit bearing stipes 38-90 mm long, the mature fruit a dry, trigonous winged capsule, to 19 mm long, still crowned by the persistent styles; the wings subequal, 11-21 mm long, 12-20 mm broad. Seeds numerous, yellow-brown, narrowly ovoid to obclavate, 0.4-0.52 mm long, 0.1-0.16 mm broad, the apex acuminate, the micropylar end abruptly constricted; seed surface cells elongate parall to the seed length.

Endemic at altitudes between 350 and 1,000 m, presently known only in Taichung and Chiayi Counties of Taiwan.

TAICHUNG: Taichung city (Toukeshan), Peng 9992. CHAIYI: Fanlu District (Longmei to Tsaoshan), Peng 10079; Meishan District (Taiping), Chen 395; Chuchi District, Peng 8894(Holotype, HAST!). 白河三層崎&天望崎