Satake, J. Fac. Sci. Univ. Tokyo, Sect. 3, Bot. 4(2): 202 (1933)
T: Taiwan, Mt. Nokozan, 1919, Matuda; holo: TI.
Perennial c. (13–) 20–25 (–30) cm long, caespitose. Stem with numerous ±flat or canaliculate basal leaves 2–3 mm wide, with straw-brown to brownish sheath bases. Cauline leaves usually 2, ±canaliculate, 4–6 cm × 1.5–2.0 mm; margins distinctly densely papillose-serrulate, sparsely ciliate; sheath densely hairy above; leaf tip obtuse and slightly swollen in basal and cauline leaves; bracts ±mucronate-acute to acute. Inflorescence erect, usually composed of 5–8 clusters, congested in a lobulate head 1.5–3.0 × 0.8–1.0 cm; basal 1 (–2) clusters ±always remote, 0.3–1.0 cm from the main head. Lower bracts herbaceous 2.0–4.0 cm × c. 1 mm, conspicuously longer than inflorescence, erect, erecto-patent or reflexed, hairy. Bracteoles usually 1.0–1.8 mm long, fimbriate near the apex, shorter than tepals. Tepals ±lanceolate, 2.0–2.3 mm long, acute, entire, dark castaneous brown, pale bordered near apex. Stamens 6; anthers 0.7–0.8 mm long, slightly shorter than 0.8–0.9 mm long filaments; style 0.2–0.3 mm long; stigmas 1.1–1.3 mm long. Capsule obovoid, subacuminate with a short beak, ±exceeding tepals; capsule segments 2.0–2.2 × 1.1–1.2 mm, brownish. Seeds ±ellipsoidal, dark brown, 1.0–1.1 × c. 0.7 mm, with whitish caruncle c. 0.1 mm long.