Atraphaxis dahurica var. davurica

Yurtseva, Olga V., Badmaeva, N. K. & Mavrodiev, Evgeny V., 2021, A broadly sampled 3 - loci plastid phylogeny of Atraphaxis (Polygoneae, Polygonoideae, Polygonaceae) reveals new taxa: II. Atraphaxis selengensis spec. nov., and A. davurica Jaub. & Spach from Russian Transbaikalia, Phytotaxa 484 (1), pp. 44-74 : 66-67

a. Atraphaxis dahurica var. davurica

= Tragopyrum pungens var. β. angustifolium Ledebour (1849: 516).

= Tragopyrum pungens var. γ inerme Ledebour (1849: 516).

Distribution:— RUSSIA, Buryatia:Bichursky distr., Dzhidinsky distr.,Ivolginsky distr., Kudarinsky distr., Kyachtinsky distr., Mukhorshibirsky distr., Selenginsky distr., Tarbagataisky distr., Zaigraevsky distr.; Tranbaikal Region: Chita distr., Zabaikalsky distr.

b. Atraphaxis davurica var. chikoensis Yurtseva & Mavrodiev , var. nov.

Type: — Khentei-Chikoy Highlands, rocky outcrops in the vicinity of the village Anagustay, 08.1960, Maximova s.n. (LE!, holotype) ( Fig. 2B ).

Shrub 30–50 cm tall, with erect, straight unarmed shoots covered with dark-gray, almost black bark and bright-green broadly or oblong elliptical leaf blades, ochreas 5–6 mm long.

Etymology:— Named after the river Chikoy.

Note: — Atraphaxis davurica var. chikoensis is possibly a species derived within A. davurica , endemic to Khentei- Chikoy Highlands, but until seeing the ripe fruits we treat it as a variety of A. davurica . It has similar shape and size of the perianth but differs by dark-gray bark and broadly elliptical leaf blades with leaf ratio 3–5.

Ecology: —Rocks, steep cliffs.

Distribution: — RUSSIA, Buryatia: Kyachta distr., valleys of the Kudara and Chikoy rivers and Khentei-Chikoy Highlands; Chita region at the border with Mongolia.

Specimens examined: — RUSSIA, Buryatia: [Kyakhta distr.]: Khentei-Chikoy Highlands, the Chikoy river, Mt. Otson , Maximova s.n. ( LE) ; Gordovy Ridge, the Chikoy , 06.1959, Maximova s.n. ( LE) ; vill. Anagustay , Maximova ( LE) ; vill. Anagustay, Gordovy Ridge, the Chikoy river , 19.07.1965, Maximova s.n. ( ТК) ; the Kudara river, Mt Turginskaya , Maximova s.n. ( LE) ; the Kudara river basin, Khankharnegu , Kursky s.n. ( LE) ; vill. Kudara, Ust-Chelutuy , Peshkova & Tarasova 2492 ( NSK) ; Chita reg.: [Transbaikal Region]: the Argun river, Mts near vill. Abagatuy , 14.09.1963, Peshkova & Martynova s.n. ( TK) .

Figures

FIGURE 2. Atraphaxis davurica (A), A. davurica var. chikoensis (B), A. pungens (C), A. selengensis (D–E) from RUSSIA, and A. frutescens from MONGOLIA (F). A—Buryatia, Mukhorshibirsky d., Podlopatki, Abramova et al. (MW). B—Buryatia, Khentei-Chikoy Highlands, Anagustay, Maximova (LE). C—Khakassia, Askiz d., Kazanovka, Skvortsov (MW). D—Buryatia, Selenginsk, Schukin (LE). E—Buryatia, Selenginsk, Daeva (MHA, Holotype). F—Khovd aimag, Bulgan, Gubanov 7503 (MW).