生活型

herb

形態特徵

• Perennial wiry herb 0.05-0.35 m, suberect to ascending from a creeping, branching rooting base, unbranched or ± branched above; stems solitary or ± caespitose, 2-4-lined, eglandular.
• Leaves sessile or subsessile; lamina 0.8-2.5 cm long, 0.05-1.2 cm broad, ovate or oblong to elliptic or oblanceolate or linear, base cordate-amplexicaul to cuneate or subangustate, chartaceous to subcoriaceous, paler and glaucous or sometimes papillose beneath, with 3 or 4 ascending lateral veins and fine reticulate venation, lax or obscure, dense or irregular intramarginal dark glands and numerous to few laminar glandular dots, varying in size, only pale or rarely mixed pale and dark.
• Inflorescence 1-11-flowered, subcorymbose, sometimes with 1-5-flowered axillary branches; flowers 15-27 mm in diam., ± plane, in bud ovoid to ellipsoid, obtuse; sepals 3-7.5 mm long, 0.8-2.5 mm broad, oblong or ovate-lanceolate to narrowly oblong, obtuse to acute, entire or rarely with 1-2 stalked marginal glands, with or without regular or irregular intramarginal glands, dark and sometimes pale, with laminar pale streaks or lines and rarely dark dots or lines, spreading or ascending in fruit; petals 8-15 mm long, 4-7 mm broad, obovate or oblong-obovate to oblanceolate, yellow, persistent, with or rarely without small dark, sessile or occasionally stalked marginal glands near apex only or round upper inner margin, with or rarely without laminar glandular lines, streaks and dots, pale and rarely also dark; stamens not or obscurely fascicled, persistent, 40-80; anthers yellow, with black gland; ovary 3-locular, the 3 styles 1.3-3 times as long (3.5-7 mm), free, ± spreading from near base.
• Capsule (5)6-7 mm long, 3.5-5 mm broad, narrowly to broadly ovoid, with longitudinal vittae; seeds ca. 1 mm long, dark brown, finely scalariform-reticulate, scarcely carinate, without terminal appendage.
• The variation from the mainly northern broad-leaved form with obtuse sepals and styles about 1.3 times as long as the ovary (<i>H. nagasawai</i>) to the southern narrow-leaved form with acute sepals and styles 2 or more times as long as the ovary (<i>H. randaiense</i> Hayata) appears to be continuous, and indeed the trends in leaf form, sepal shape and style length are only partially correlated. It is not possible, therefore, to recognize <i>H. randaiense</i> as a distinct species. Similarly, plants described as <i>H. suzukianum</i> Y. Kimura and <i>H. hayatae</i> Y. Kimura, respectively, are more extreme forms of trends within <i>H. nagasawai</i>; and the occasional forms with dark-glandular-ciliate sepal margins (<i>H. taiwanianum</i> Y. Kimura) are linked to the more typical forms by specimens with one or two glandular cilia on each sepal margin.

分布

• 台灣 : central mountains. On stony or rocky slopes, at roadsides, in conifer forests, 2,300-3,960 m.

引證標本

ILAN: Chiliting to Nanhushanchuang, Hsu 5930. HSINCHU: Tapachienshan, Moo 2059. TAICHUNG: Pahsienshan, Liu, Kou, Kao et al. 328. NANTOU: Tienchih to Yunhai, Kao 5870. CHIAYI: Paiyun Hostel to top of Mt. Morrison, Hsu 6283. HUALIEN: Kao 7807.

引用文獻

• ROBSON, NORMAN K. B., Flora of Taiwan, second edition 2: 707. 1996.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)