Eucosia longirostrata (Hayata) Hsu

Suetsugu, Kenji & Hsu, Tian Chuan, 2021, Taxonomic notes on the genus Eucosia (Orchidaceae) in Japan and Taiwan, Phytotaxa 520 (2), pp. 215-224 : 221

Eucosia longirostrata (Hayata) Hsu in Hsu & Chung (2016: 35). Figs. 1 (I–L) & 5.

≡ Goodyera longirostrata Hayata (1914: 115) .

Type:— TAIWAN. Pingtung County: Mt. Wuwei (“Akocho, Buisan”), 24 March 1910, T. Kawakami & S. Sasaki s.n. (holotype: TI- 00082033!) .

= Goodyera seikoomontana Yamamoto (1932: 187) ; Goodyera viridiflora var. seikoomontana (Yamamoto) Ying (1977: 198) ; Eucosia seikoomontana (Yamamoto) Pace (2020: 263) , [as “seikomontana”], syn. nov.

Type:— TAIWAN. Taitung County: Mt. Chenkuanao (“ad circ. 4000 ped. alt. montis Seikoozan”), May 1932, Yamamoto s.n. (holotype: TAI118722 !) .

= Goodyera youngsayei Hu & Barretto (1976: 10) , syn. nov.

Type :— CHINA. Hong Kong: Pat Sin Range, 12 March 1975, G. Barretto 107 (holotype: K 000942761 !; isotype: AMES00074539 image!) .

Morphological descriptions and illustrations: —See Leou (2000: 909; photo 121), Chen et al. (2009: 49), Barretto et al. (2011: 116; f. 90–92), Huang et al. (2012: 761; pl. I, E) and Lin (2019: 159; f. 64; pl. 8), all as Goodyera seikoomontana ; Hsu & Chung (2016: 35).

Distribution: —This species is confined to Taiwan and S China (Guangdong, Guangxi, Hainan and Hong Kong).

Additional specimens examined: — CHINA. Guangdong: Xinyi, Daping , 25 March 1932, Huang 31882 ( IBSC) . Guangxi: Jingxi, Hurun , 15 June 2010, Xu & Liu 10503 ( IBK) ; Shangsi, Anonymous collectors (“ 十万*山※ẳľ ”) 1742 ( IBK) . Hainan: Ledong, Jianfenglinh , 23 April 2013, Hsu 6525 ( TAIF) . Hong Kong: Pat Sin Ridge , January 1974, Guile 6926 ( K) . TAIWAN. Hualien: Tatong 18 March 2011, Hsu 4262 ( TAIF) ; Kuangfu Logging Road , 14 February 2007, Lii 1518 ( TAIF) . Miaoli: Nanchuang , 25 October 1972, Lin 36 ( TAIF) . Pingtung: Chachayalaishan , 29 February 1992, Liao 196 ( HAST) ; Lilungshan , 1 January 1974, Lin 111 ( TAIF) ; Lilungshan , 14 February 1989, Su 8798 ( HAST) ; Lilungshan , 24 January 1990, Su 9262 ( HAST) ; Mt. Lilung , 3 April 2004, Chung 7054 ( TAIF) ; Puanshan, Wang 19011 ( HAST) . Taitung: Hsinkangshan , 24 February 1987, Su 7737 ( HAST) ; Mt. Tulan , 2 March 2006, Chung 9282 ( PE, TAIF) ; Mt. Tulan , 29 March 2007, Chung et al. 9061 ( TAIF) ; Mt. Tulan , 5 February 2007, Wang 26 ( TAIF) ; Mt. Tulan , 23 February 2007, Wang 38 ( TAIF) ; Mt. Tulan , 1 March 2013, Lu 26518 ( TAIF) .

Taxonomic remarks: —The holotype of Goodyera longirostrata ( Fig. 5G ) contains a single plant with several leaves and two flowers (one had been cut and dissected). The leaves are thick-textured, broadly cuneate to rounded at base and flat in margins, with submarginal main lateral veins and 2–4 cm long stipes ( Fig. 5H ); the flowers are relatively large, with sepals ca. 1.5 cm long and column plus rostellum ca. 9 mm long. All these characteristics indicate that this plant corresponds to the species commonly known as Goodyera seikoomontana (e.g., Barretto et al. 2011; Huang et al. 2012; Lin 2019), rather than a synonym of Eucosia (Goodyera) viridiflora as proposed by some authors (eg. Lin 2019; Pace 2020). The earlier published G. longirostrata should thus take priority against G. seikoomontana .

Figures

FIGURE 1. Morphological comparison of Eucosia species.A–D. E. carnea; A–C from Taiwan (Hsu 8166, TAIF); D from Japan (H. Ueno 364, KAG). E–H. E. cordata; E–G from Taiwan (Hsu 4615, TAIF); H from Vietnam (Hsu 12391, TAIF). I–L. E. longirostrata; I–K from Taiwan (Hsu 4262, TAIF); L from China (Hsu 6525, TAIF). M–P. E. viridiflora; M–O. from the Philippines (Hsu 6994, TAIF); P. from the Solomon Islands (Hsu et al. SITW01587, TNM). Scale bars = 1 cm.

FIGURE 5. Eucosia longirostrata from Taiwan (A–F, Hsu 13339, TAIF).A. Habit. B–D. Flower. E–F. Leaf; dorsal view (E), ventral view (F). G–H. Holotype of Goodyera longirostrata (Kawakami & Sasaki s.n., TI); arrows indicate the positions of main lateral veins. Scale bars:A & G = 5 cm; B–F & H = 1 cm.