Carex truncatirostris S.W.Su & S.M.Xu (1989: 45)

Jin, Xiao-Feng, 2017, Taxonomic revision of Carex chungii (Cyperaceae; sect. Mitratae) and allied species, Phytotaxa 317 (1), pp. 29-41 : 39-40

5. Carex truncatirostris S.W.Su & S.M.Xu (1989: 45) . Type:― CHINA, Anhui: Taihu, Lidu, 28 Apr. 1983, S.W. Su

83164 (holotype: ACM!; isotype: PE!). ( Fig. 4F–K , Fig. 5B )

= Carex truncatirostris S.W.Su & S.M.Xu f. erostris S.W.Su & S.M.Xu (1989: 47) . syn. nov. Type:― CHINA, Anhui: Taihu, Shanlong, 1 May 1979, S.W. Su 79051 (holotype, ACM).

= Carex anhuiensis S.W.Su & S.M.Xu (1989: 47) . syn. nov. Type:― CHINA, Anhui: Xiuning, Liukou , 20 Apr. 1981, S.W. Su 81008 (holotype, ACM!; isotype, PE!).

= Carex xuanchengensis S.W.Su & S.M.Xu (1989: 48) . syn. nov. Type:― CHINA, Anhui: Xuancheng, Xikou , 14 Apr. 1985, S.W. Su 85067 (holotype, ACM!; isotype, PE!).

Perennial. Rhizome short, cespitose, woody. Culms 10–40 cm tall, trigonous, filiform, smooth, with brown fibrous sheaths at base. Leaves longer than or equaling to culms, rarely shorter than culms; blades 1.5–2.5 mm wide, flat, scabrous on upper margins. Bracts setaceous, shortly sheathing; sheaths 2–8 mm long. Spikes 3–5, upper 2 or 3 approximate; terminal spike staminate, sometimes with a few pistillate flowers, linear-cylindrical, 1–2 cm long, 0.6–1 mm wide, subsessile, rarely pedunculate; lateral spikes pistillate, with the lowermost arising from the base of culms, narrowly cylindrical, 1–2 cm long, 2–2.5 mm wide, loosely flowered. Staminate scale pale brown, 3.5–4 mm long, obovate-oblong, oblong or elliptic-oblong, with greenish brown 3-veined costa excurrent into a short-mucro or obtuse at apex. Pistillate scales pale brown or yellowish brown, 2–2.5 mm long, obovate or obovate-oblong, with green 3- veined costa excurrent into a short-mucro, or obtuse to marginated at apex. Perigynia rhombic-ovoid, longer than pistillate scales, 3–3.5 mm long, obtusely trigonous, green or yellowish green, sparsely pubescent, distinctly veined, gradually contracted to a 0.5–0.7 mm long beak; orifice 2 lobed with short teeth. Achenes tightly enveloped, rhombic-ovoid, trigonous, 2–2.2 mm long, castaneous, with the 3 angles constricted at middle, lateral sides concave above and below, attenuated into a shortly stipitate base, abruptly contracted and then widened at apex into a discoid-annulate style-base; style thickened at base; stigmas 3.

Distribution and habitat:— Endemic to China. This species is distributed in Anhui, Hunan, Jiangsu and Zhejiang provinces of East China ( Fig. 5B ). It grows in meadows, slopes, bamboo forests, or roadsides at an elevation of 100‒ 1150 m.

Phenology:— Flowers and fruits in mid April to mid May.

Additional specimens examined:― CHINA. Anhui: Qingyang, Mt. Jiuhua, X.F. Jin & W.J. Chen 3391, 3392 (HTC); Taihu, Dashan, X.F. Jin & W.J. Chen 3418, 3419 (HTC), S.W. Su 83098 (ACM); Xiuning, Mt. Qiyun, Y. Zheng & al. 2721, 2722, 2723, 2724 (HTC); Xuancheng, Huayang, S.W. Su 85082 (ACM), Xikou, Y. Zheng & al. 2733, 2734, 2735, 2736, 2737, 2741, 2743, 2744 (HTC); Yuexi, Meili, X.F. Jin & W.J. Chen 3428 (HTC). Hunan: without precise locality, P.Z.Ye 93 (PE). Jiangsu: Nanjing, Mt. Qixia, C.Y. Chiao 2089 (KUN); Yixing, Qianya, S.H. Mao 26 (NAS). Zhejiang: Hangzhou, X.F. Jin 6993 (HTC), X.F. Jin & H. Wang 1465 (HTC); Lin’an, Mt. Tianmu, X.F. Jin 2 (HTC), H. Migo s. n. (NAS, PE); Pan’an, Lingkou, L. Hong 3082 (HTC), Molin, X.F. Jin & W.J Chen 2674 (HTC); Shanghu, X.F. Jin 2657 (HTC).

Figures

FIGURE 4. A–E. Carex chungii Z. P. Wang. (A) habit; (B) staminate scale; (C) pistillate scale; (D) perigynium; (E) achene. F–K. Carex truncatirostris S.W.Su & S.M.Xu. (F) habit; (G) staminate spike; (H) staminate scale; (I) pistillate scale; (J) perigynium; (K) achene. (A–E from X.F. Jin & al. 2748 in HTC; F–K from Y. Zheng & al. 2744 in HTC; drawn by Xiao-feng Jin).

FIGURE 5. Distribution map of Carex chungii and allied species. (A) Carex chungii; (B) Carex truncatirostris; (C) Carex dapanshanica (■) and C. nanpingensis (●); (D) Carex genkaiensis.