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Nomenclatural Novelties in Chinese Elymus (Poaceae, Triticeae)

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Nomenclatural Novelties in Chinese Elymus (Poaceae, Triticeae) Nomenclatural Novelties in Chinese Elymus (Poaceae, Triticeae) Guanghua Zhu Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A. Shouliang Chen Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, Jiangsu 210014, People's Republic of China ABSTRACT. In the treatment of the Triticeae (Po- 1990; Baum et al., 1991; Cai, 1997; Yang et al., aceae) for the Flora of China, Roegneria K. Koch 2001). is recognized as a synonym of Elymus L. This de- Linnaeus (1753) included ®ve species within cision led to the following 18 nomenclatural nov- Elymus, which was lectotypi®ed by Hitchcock (in elties: E. abolinii (Drobow) Tzvelev var. nudiusculus Hitchcock & Green, 1929) on E. sibiricus L. Since (L. B. Cai) S. L. Chen & G. Zhu, comb. et stat. 1753, the generic name has been adopted by most nov.; E. angustispiculatus S. L. Chen & G. Zhu, authors, but with very different taxonomic concepts. nom. nov.; E. caianus S. L. Chen & G. Zhu, nom. Traditionally, this genus consists of grass species nov.; E. cheniae (L. B. Cai) G. Zhu, comb. nov.; E. with more than one (often two) spikelets at each curtiaristatus (L. B. Cai) S. L. Chen & G. Zhu, node. Based on such a concept, Hitchcock (1935) comb. nov.; E. debilis (L. B. Cai) S. L. Chen & G. included Leymus Hochstetter and Psathrostachys Zhu, comb. nov.; E. gmelinii (Ledebour) Tzvelev Nevski in his delimitation of Elymus. Nevski (1934) var. macrantherus (Ohwi) S. L. Chen & G. Zhu, placed these traditional Elymus species under Cli- comb. nov.; E. hongyuanensis (L. B. Cai) S. L. Chen nelymus (Grisebach) Nevski, and included some & G. Zhu, comb. nov.; E. kamoji (Ohwi) S. L. Chen unrelated rhizomatous species under Elymus. This var. macerrimus G. Zhu, var. nov.; E. laxinodis (L. treatment was accepted by Keng (1959). In addition B. Cai) S. L. Chen & G. Zhu, comb. nov.; E. mag- to these traditional species, Tzvelev (1976) also in- nipodus (L. B. Cai) S. L. Chen & G. Zhu, comb. cluded in Elymus those self-pollinated species with nov.; E. serpentinus (L. B. Cai) S. L. Chen & G. clustered habit and always one spikelet per node. Zhu, comb. nov.; E. shouliangiae (L. B. Cai) G. The name Roegneria K. Koch was published in Zhu, comb. nov.; E. sinicus (Keng) S. L. Chen var. 1848, based on R. caucasica K. Koch, and was medius (Keng) S. L. Chen & G. Zhu, comb. nov.; mostly ignored for almost a century afterward. Its E. sino¯exuosus S. L. Chen & G. Zhu, nom. nov.; species, characterized by a single spikelet per E. strictus (Keng) AÂ .LoÈve var. crassus (L. B. Cai) node, were mostly treated in Agropyron Gaertner S. L. Chen & G. Zhu, comb. et stat. nov.; E. tri- sensu lato (Bentham & Hooker, 1880; Hitchcock, chospicula (L. B. Cai) S. L. Chen & G. Zhu, comb. 1935; Bor, 1960). When rede®ning the generic lim- nov.; and E. yushuensis (L. B. Cai) S. L. Chen & its within the Triticeae, Nevski (1934) limited the G. Zhu, comb. nov. generic concept of Agropyron to only the typical Key Words: China, Elymus, Poaceae, Roegner- wheatgrass species and revived the name Roegner- ia, Triticeae. ia. Agropyron sensu stricto has been widely ac- cepted since then. The genus Roegneria has been The grass tribe Triticeae is complex for its tax- accepted principally by Chinese and Japanese au- onomy at the generic level mainly because of the thors (Ohwi, 1941, 1942; Keng, 1959; Keng & existence of many natural and arti®cial intergeneric Chen, 1963; Yang, 1980, 1987; Zhu et al., 1990; hybrids (Stebbins, 1956; Dewey, 1982; Barkworth Zhu & Yang, 1990; Zhang et al., 1991; Baum, & Dewey, 1985; Kellogg, 1989). It has been sug- 1991; Cai, 1997), but has been treated in the syn- gested by different authors that the tribe consists onymy of Elymus by others (Melderis, 1980; Dewey, of a single genus or up to 38 genera (LoÈve, 1984). 1982; LoÈve, 1984; Clayton & Renvoize, 1986; The generic limits of Roegneria K. Koch and Ely- Chen, 1997). In the treatment of the Triticeae for mus L. are among the well-known taxonomic prob- the Flora Reipublicae Popularis Sinicae, Yang lems in the tribe (Dewey, 1982, 1983, 1984; LoÈve, (1987) included only those species with two spike- 1984; Kellogg, 1989; Zhu et al., 1990; Zhu & Yang, lets per node under Elymus and included all those NOVON 12: 424±429. 2002. Volume 12, Number 3 Zhu & Chen 425 2002 Chinese Elymus (Poaceae) with one spikelet per node in Roegneria. Yang's 2. Elymus angustispiculatus S. L. Chen & G. concepts are widely accepted in China. The genus Zhu, nom. nov. Replaced synonym: Roegneria Roegneria is recognized in all present Chinese local angusta L. B. Cai, Acta Phytotax. Sin. 34: 332, ¯oras, and new species are continually being de- ®g. 3(1±9). 1996, non Trinius ex Ledebour, Fl. scribed under this name (Zhu et al., 1990; Zhu & Altaic. 1: 119. 1829. TYPE: China. Qinghai: Yang, 1990; Cai, 1994, 1996a, 1996b, 1997; Cai Xunhua, on mountain slope, alt. 2200 m, 8 & Wang, 2001). July 1984, G. X. Lei 841810 (holotype, The aim of this article is not to justify the inclu- HNWP). sion of Roegneria within Elymus. One may argue both ways due to the taxonomic complexity of the A new name for this species is proposed here whole tribe. As coauthors of the treatment of tribe because the epithet ``angustus'' is not available for Triticeae for the English-language Flora of China use in the genus Elymus. Elymus angustispiculatus (Chen & Zhu, in prep.), we have decided to treat is compared in its protologue for unknown reasons Roegneria as a synonym of Elymus. This requires with E. barbicallus (Ohwi) S. L. Chen, which is not closely related. The latter is easily distinguishable the following 18 new names or new combinations by its awnless glumes. Elymus angustispiculatus is to be made available for the Flora. in fact closest to E. tibeticus (Melderis) G. Singh in having spikelets sessile, glumes shortly aristate, lemma with long awns, and palea nearly as long as 1. Elymus abolinii (Drobow) Tzvelev var. nu- the lemma. Elymus angustispiculatus differs from E. tibeticus in having spikes 8±10 cm long (vs. 10± diusculus (L. B. Cai) S. L. Chen & G. Zhu, 16 cm long) and lemma sparsely pubescent (vs. gla- comb. et stat. nov. Basionym: Roegneria nu- brous) with awns strongly recurved (vs. straight or diuscula L. B. Cai, Acta Phytotax. Sin. 35: slightly curved). 171. 1997. TYPE: China. Xinjiang: Nileke, along bank of stream, alt. 1650 m, 6 July 1976, Exped. Xinjiang 1746 (holotype, XJBI). 3. Elymus caianus S. L. Chen & G. Zhu, nom. nov. Replaced synonym: Roegneria gracilis L. Only two collections are known of this variety. A B. Cai, Acta Phytotax. Sin. 34: 328±330, ®g. second specimen cited in the protologue, N. R. Cui 1(9±15). 1996, non Philippi, Linnaea 33: 301. 82987, was collected from Xiyuan County, Xin- 1865. TYPE: China. Xizang [Tibet]: Gongbo- jiang, but was not seen by the present authors. This gyamda, along bank of river, alt. 3970 m, 21 specimen is presumably deposited in Xinjiang Nor- Sep. 1988, J. L. Yang et al. 880788 (holotype, SAUTI). mal University herbarium (XJNU), where the col- lector was employed. The holotype can be easily A new name for this species is proposed here identi®ed as Elymus abolinii and differs only in because the epithet ``gracilis'' is not available for having spikelets with 4 or 5 ¯orets each and an- use in the genus Elymus. It is named in honor of thers ca. 5 mm long. Elymus abolinii is a variable Lianbing Cai, who ®rst described this species. Ely- species. Other characters discussed in the proto- mus caianus was compared with E. puberulus logue of Roegneria nudiuscula, such as spikes rel- (Keng) AÂ .LoÈve in its protologue. However, little atively short, glumes lanceolate and acute, lemma similarity can be found between these two species. densely pubescent, and the length of lemma awns, Elymus caianus is readily distinguishable from the all fall within the range of variation of E. abolinii. sparsely tufted E. puberulus by its single-culmed Therefore, the former taxon can only be accepted habit. In addition, E. caianus has spikelets purple at the varietal level under the latter. with 3 or 4 ¯orets each and the lower glume much The basionym of Elymus abolinii is Agropyron less than half as long as the lemma, whereas E. abolinii Drobow, the epithet of which was spelled puberulus has spikelets green with 2 or 3 ¯orets ``abolini'' in the protologue (Drobow, 1925). The each and the lower glume about half as long as the species was named after the type collector, Robert lemma. Elymus caianus is similar to E. hongyu- Ivanovich Abolin, so according to Article 60.11 of anensis L. B. Cai in the above characters, but dif- the ICBN (Greuter et al., 2000), the epithet was fers in having spikes more or less pendulous, palea correctly changed to ``abolinii'' when Tzvelev made spiny but glabrous between the keels, and anthers the new combination under Elymus. yellow. 426 Novon 4. Elymus cheniae (L. B. Cai) G. Zhu, comb. nov. in the protologue, in the slender appearance of the Basionym: Roegneria cheniae L. B. Cai, Acta culms. Elymus calcicolus is a much larger plant (ca. Phytotax. 34: 333, ®g. 3(10±18). 1996. TYPE: 1 m tall), with spikes 12±20 cm long, whereas E. China. Xinjiang: Zhaosu, alt. 2300 m, 3 Aug. debilis is smaller (up to 60 cm tall) with spikes 9± 1978, K. Tuo 780875 (holotype, XJBI). 11 cm long. Elymus debilis is closest to E.
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