Sedum triangulisepalum T.S. Liu & N.J. Chung ex T.C. Hsu & S.W. Chung, 2022

Hsu, Tian-Chuan & Chung, Shih-Wen, 2022, Validation of the name Sedum triangulosepalum (Crassulaceae), Phytotaxa 547 (2), pp. 215-216 : 215

Sedum triangulisepalum T.S. Liu & N.J. Chung ex T.C. Hsu & S.W. Chung , sp. nov.

[“ Sedum triangulisepalum T.S. Liu & N.J. Chung (1977: 21, as triangulosepalum )”, nom. inval.; “ Sedum triangulisepalum T.S. Liu & N.J. Chung ex H.W. Lin (1999: 102 , as triangulosepalum )”, nom. inval.; “ Sedum triangulisepalum T.S. Liu & N.J. Chung ex S.W. Chung ” in Chen et al. (2017: 329, as triangulosepalum ), nom. inval.].

Type: — TAIWAN. Hualien County: Hsiulin Township, Lo-ma-wan Shan , 1800 m elev., 15 June 1973, N.J. Chung 280 (holotype: NTUF!, barcode: F00008307; isotypes: NTUF!, eight sheets, barcodes: F00008308–F00008315) .

Diagnosis: — Sedum triangulisepalum is similar to S. truncatistigmum T.S. Liu & N.J. Chung (1977: 23) in sharing epiphytic life-form, alternate and ±flattened leaves and fused calyx, while the former is readily distinguished in having longer calyx (1.5–2.0 vs. 0.8–1.0 mm) that are only fused at the base (vs. nearly entirely fused).

Morphological descriptions and illustrations: —This species has been described by Liu & Chung (1977: 21) and illustrated by Tang & Huang (1989: 27, pl. 15, as Sedum microsepalum ), Chen et al. (2017: 329) and Ito et al. (2017: 11, fig. 1D).

Distribution and ecology: — Sedum triangulisepalum is endemic in Taiwan, where it occurs in the northern and eastern portions of the main island and usually grows on tree trunks in montane cloud forests at 500–2000 m elev. ( Liu & Chung 1977; Chen et al. 2017; Ito et al. 2017).

Etymology: —The specific epithet is composed of two Latin elements: triangulus, triangular, and sepalum, sepal, referring to its triangular calyx lobes. It should be spelt as “ triangulisepalum ” instead of “ triangulosepalum ” as originally published by Liu & Chung (1977) according to Art. 60.10 of the ICN.

Note: —Two gatherings, “ Suzuki s.n. ” collected from Wulai and “ Chuang 280 ” collected from Lomawanshan, were cited under Sedum triangulisepalum by Liu & Chung (1977), and “ Chuang 280 ” is presumably a typo of “ Chung 280 ” since the “ N.J. Chung 280 ” gathering, collected by the second original author and currently preserved in NTUF, matches well with the data given in the original publication ( Liu & Chung 1977). There are nine duplicates of Chung 280, including one (barcode: F00008307) labelled as “ holotype ” and the others (barcodes: F00008308–F00008315) as “isotype”. Although these labels could not be archived as the legitimate designation of types as they are not effectively published (see Art. 7.10 of the ICN), they supposedly reflect the original author’s intention and are thus adopted here. Images of all type materials are available in the “Plants of Taiwan ” database [http://tai2.ntu.edu.tw].