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FOC | Family List | FOC Vol. 5 | Aristolochiaceae | Asarum

26. Asarum hypogynum Hayata, Icon. Pl. Formosan. 5: 144. 1915.

下花细辛 xia hua xi xin

Asarum grandiflorum Hayata (1915), not Klotzsch (1859); A. grandiflorum var. colocasiifolium Hayata; A. hayatanum F. Maekawa ex Masamune; Heterotropa hayatana F. Maekawa; H. hayatana f. colocasiifolia (Hayata) F. Maekawa ex Nemoto; H. hypogyna (Hayata) F. Maekawa ex Nemoto.

Herbs. Rhizomes vertical, 5-6 mm in diam., internodes less than 1 cm. Leaves solitary; petiole 10-18 cm, glabrescent; leaf blade adaxially green with white spots, oblong-triangular, 13-19.5 × 6.6-20 cm, abaxial surface uniformly pale green, dotted with glands, adaxial surface initially glabrescent, base deeply cordate, lateral lobes 3-9 × 2.8-9.5 cm, apex acuminate or caudate; cataphylls ovate, ca. 0.4 × 0.5 cm. Peduncle ascending, 3-6 cm. Calyx purple-green, campanulate-rotate, 3-3.5 × 3-4 cm; sepals connate beyond attachment to ovary, abaxially glabrous; tube subcylindric, ca. 0.9 × 1 cm, strongly constricted at throat, adaxially tessellate, orifice ring ca. 1.5 mm wide; lobes subrotund, ca. 1 × 2 cm, base with abundant glands and papillate-corrugate area. Stamens 12; filaments much shorter than anthers; connectives not extended beyond anthers, rounded. Ovary superior or half-inferior. Styles free, apex 2-cleft; stigmas subterminal. Fl. Oct-Jul.

* Forests, shady areas, mountain slopes; 1000-2000 m. Taiwan.

No specimens were seen; the data above are from the original description and figure.


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