中华草沙蚕 zhong hua cao sha can

Nardurus filiformis (Salzmann ex Willkomm & Lange) C. Vicioso var. chinensis Franchet, Nouv. Arch. Mus. Hist. Nat., sér. 2, 7: 149. 1884; Tripogon chinensis subsp. coreensis (Hackel) T. Koyama; T. chinensis var. coreensis Hackel; T. coreensis (Hackel) Ohwi.

Culms 10–30 cm tall. Basal leaf sheaths papery, tardily fibrous; leaf blades 5–15 × ca. 0.1 cm, adaxial surface scabrid, sometimes loosely pilose with long scattered hairs, abaxial surface glabrous. Racemes 6–15 cm, slender, spikelets appressed to rachis, slightly imbricate by up to 1/3 their length. Spikelets 4.5–8 mm, gray-green; florets 3–5, loosely imbricate, rachilla usually partially visible; lower glume lanceolate, nearly symmetrical, 1.2–3 mm, acuminate-mucronate; upper glume elliptic-oblong, 2.5–4.5 mm, thickened along midvein, margins broad, scarious, apex sharply acute or subacute and mucronate; lemmas oblong-ovate, 2–3.3 mm to sinus, 2-dentate, central awn clearly shorter than its lemma, 1–2 mm, erect, teeth broad, obliquely truncate to acute, lateral veins extended into 0.2–0.5 mm awns; palea keels very narrowly winged, ciliolate. Anthers 3, 1–1.5 mm. Fl. and fr. Jul–Sep.

Dry stony slopes, among rocks; 200–2200 m. Anhui, Gansu, Hebei, Heilongjiang, Henan, Hubei, Jiangsu, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shandong, Shanxi, Sichuan, Taiwan, Xinjiang, Xizang, Yunnan [Mongolia, Philippines, E Russia].