Asarum hypogynum

下花細辛

endemic

Asarum hypogynum Hayata

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

名彙資訊

學名發表文獻

Hayata. 1915. Icones Plantarum Formosanarum 5: 144. (Icon. Pl. Formos.)

台灣首次記錄發表文獻

同發表文獻

異名

Heterotropa hayatana Maekawa

Meakawa. 1936. Journal of Japanese Botany 12: 34. (J. Jpn. Bot.)
Asarum grandiflorum Hayata

Hayata. 1915. Icones Plantarum Formosanarum 5: 141. (Icon. Pl. Formos.)
Asarum grandiflorum Hayata var. colocasiifolium Hayata

Hayata. 1915. Icones Plantarum Formosanarum 5: 144. (Icon. Pl. Formos.)
Heterotropa hayatana Maekawa f. colocasiifolium (Hayata) Maekawa ex Nemoto

Meakawa ex Nemoto. 1936. Flora of Japan supplement 160. (Fl. Japan, Suppl.)
Heterotropa hypogyna (Hayata) Maekawa ex Nemoto

Maekawa ex Nemoto. 1936. Flora of Japan supplement 161. (Fl. Japan, Suppl.)
Asarum hayatanum Maekawa ex Masam.

Liu & Lai. 1976. Flora of Taiwan 2: 578. (Fl. Taiwan)

各語言俗名

中

下花細辛、芋葉細辛
日

いもばかんあおい

參考文獻

Yang. 1982. A list of plants in Taiwan. (List Pl. Taiwan)

特徵描述

生活型

herb

形態特徵

Adventitious roots many, narrower than the rhizome, young roots hairy, glabrescent. Rhizomes striate, glabrous; annual vegetative branch with 2 or 3 prophylls on lower part, prophylls 4 mm long, sparsely hairy.
Leaves long petiolate; petioles hairy when young, glabrescent, grooved; blade triangular, hairy along veins beneath when young, glabrescent, glabrous above, green and white spotted above, pale green and with scattered small glandular dots beneath, acuminate to caudate at apex, cordate and 2-lobed at base, 13-19.5 cm long, 6.6-20 cm broad, lobes 3-9 cm long, 2.8-9.5 cm broad.
Flowering branch with prophyll scars at the base of pedicel; upper cataphyll membranous, hyaline, ovate, margin hairy, glandular dotted beneath; flowers glabrous outside; calyx tube reticulate-ridged inside, glabrous, orifice rim large, rugous above ridge, with lamellate appendage between orifice and calyx lobes; lobes 3, glabrous inside, with abundant short glands, rough on surface; stamens 12, shorter than pistil; ovary fused; styles 6, free; stigma terminal, or subterminal, orbicular to slightly oblong.
Seeds ovate, brownish white, glandular dotted, 3.8 mm long.
Asarum hayatanum (=A. grandiflorum) was separated from A. hypogynum by its larger flowers and terminal, decurrent stigma by Hayata in 1915. Maekawa (1978) mentioned that the stigma of A. hayatanum is terminal and orbicular. In this study, no decurrent stigmas were found except the terminal and subterminal ones, and is here treated as conspecific.