Elymus praeruptus Tzvelev

Alieva, Kumush B., Peng, Yilong, Usupbaev, Adilet, Tojibaev, Komiljon Sh., Yusupov, Ziyoviddin, Ergashov, Ibrokhimjon, Azimova, Dilnoza & Jiang, Zhilin, 2025, Synopsis of the genus Elymus (Poaceae) in Uzbekistan (Middle Asia) with a description of Elymus uzbekistanicus a new species from Turkestan Mts, PhytoKeys 257, pp. 9-50 : 9-50

7. Elymus praeruptus Tzvelev in Novosti Sist. Vyssh. Rast. 9: 61 (1972)

≡ Agropyron interruptum Nevski in Izv. Bot. Sada Akad. Nauk S. S. S. R. 30: 632 (1931 publ. 1932). ≡ Roegneria interrupta (Nevski) Nevski in Trudy Sredne-Aziatsk. Gosud. Univ., Ser. 8 b, Bot. 17: 68 (1934). ≡ Semeiostachys interrupta (Nevski) Drobow in Fl. Uzbekistan. 1: 282 (1941).

Type.

Uzbekistan • Samarkand region and surroundings, Zimarl on Djidjik-Rute , meadow by the stream, 12 VII 1913, B. Fedtschenko 183 (holotype: LE) .

Description.

Stems 30–150 cm. Leaves 1.2–4 mm wide, often longitudinally folded, grayish green, adaxially with fairly prominent ribs, densely short hairy. Sheaths glabrous or hairy. Ligule to 1.2 mm. Spikes erect. Spikelets solitary along axis of spike. Lower internodes of rather loose spikes smooth or with scattered short spines along ribs. Glumes broadly lanceolate, margins membranous, apex rapidly acuminate. Lemma with scattered spines, often with bluish bloom; awn more or less bent to side, 20–30 mm. Palea linear, nearly equal to lemma. Anthers 3–4.5 mm (Fig. 9 ).

Phenology.

Flowering and fruiting: June-July.

Habitat.

On rocky slopes, cliffs, meadows, and gravelly areas, in middle and upper mountain belts, 1500–3100 m.

General distribution.

Middle Asia (Western Tian Shan, Pamir-Alay: Alay, Hissar, Darvaz mountain ranges): Kyrgyzstan, Tajikistan, Uzbekistan.

Distribution in Uzbekistan.

Jizzakh, Kashkadarya, Namangan, Surkhandarya, Tashkent, and Fergana regions (Fig. 3 G ). I- 1 Western Tian Shan district. I- 1 - a Ugam-Pskem region. PSKEM RANGE (Upper reaches of the Oygaing River. Slopes of the right bank of Tundyk-say, 21. 08. 1956, Granitov 1615 [TASH 040969!]; Oygaing River valley, upper reaches of the Tunduksay gorge. Altitude 2269 m, 10. 08. 2019, Tojibayev, Juramurodov 1008103 [TASH 060161!]; Upper reaches of the Barkraksay gorge. Altitude 2540 m, 11. 08. 2019, Tojibayev, Juramurodov 1108167 [TASH 060160!], [TASH 060159!]); I- 1 - b Western Chatkal region. CHATKAL RANGE (Mik-dzhilke tract. Upper reaches of the Nurek-ata River. Gravelly slopes, 21. 07. 1936, Korotkova, Titov 1602 [TASH 040943!]); I- 1 - c Arashan region. CHATKAL RANGE (Angren Expedition. Syr-Darya region, Tashkent district. Pass Arasan, altitude 2500 m, and the slopes leading to it, 17. 08. 1924, Sovetkina 192 [TASH 040949!, TASH 040952!]); I- 1 - d Kurama region. CHATKAL RANGE (Southern slopes. Pass from Angren to Parkent. Substrate: rocky-gravelly, with pebbles, 22. 07. 1939, Kudryashev 878 [TASH 040937!, TASH 040954!]; Basin of the Angren River. Pass between Bashkutan-say and Aksu-say. On a fine-soil and gravelly slope, 01. 08. 1954, Butkov, Mailun 577 [TASH 040945!, TASH 040955!]). I- 3 Fergana-Alay district. 1-3 - b Eastern-Alay region. ALAY RANGE (Skobelievsky District. Northern slope of the Alay Range. Basin of the Shakhimardan River. Upper reaches of the Shivali River. Rocky slope with juniper tree, 25. 07. 1915, Drobow 271 [TASH 045196!]). I- 5 Kuhistan district. I- 5 - a North Turkestan region. TURKESTAN RANGE (Zaamin Forestry. Gorge of the Kul-su River, 26. 07. 1923, Popov, Androsov 99 [TASH 045189!]; 118 [TASH 045190!]; Zaamin Forestry. Gorge of the Gurulash River, 26. 07. 1923, Popov, Androsov s. n. [TASH 045187!]; 26. 07. 1926, Popov, Androsov s. n. [TASH 045188!]; Gallya-Aral District. Mountain Chumkar-Tau. Ridge between the passes Urmitan and Guralash. (Absolute height 3000–3100 m), 16. 08. 1932, Titov Eliseeva 295 [TASH 045194!, TASH 045195!]; Northern slopes of the Turkestan Range, upper reaches of the Sanzar River. Guralash-Sai Nature Reserve. On the southeast slope, burned areas, 09. 08. 1937, Korotkova, Vasilykovskaya 954 / а [TASH 045191!]; At the head of Guralash. Watershed between the Langar and Kichik-Shibarly ranges, 13. 08. 1937, Korotkova, Vasilykovskaya 1003 [TASH 040939!]; Along the red scree on the left side of Angirly-Sai, 28. 08. 1937, Korotkova, Vasilykovskaya 1187 [TASH 045192!, TASH 045193!]). I- 6 Western Hissar district. I- 6 - a Kashkadarya region. HISSAR RANGE (Northern slopes of the Hissar Range. Basin of the Kashkadarya River. Gorge of the Tamshush River (tributary of Ak-su). Near the Tamshush Pass. Alpine belt. Rocks, 03. 08. 1937, Kudryashev 1373 [TASH 040944!, TASH 040953!]). I- 7 Hissar-Darvaz district. I- 7 - a Sangardak-Tupalang region. HISSAR RANGE (Basin of the Tupalang River. Upper reaches of the Khovat River. Right bank of the Khovat River in the alpine zone, 10. 09. 1947, Pyataeva 631 [TASH 040960!]).

Figures

Figure 3. Distribution maps of Elymus species in Uzbekistan A E. caninus B E. lachnophyllus C E. fedtschenkoi D E. longearistatus E E. macrochaetus F E. nevskii G E. praeruptus H E. transhyrcanus I E. tschimganicus J E. tianschanigenus.

Figure 9. Elymus praeruptus a spike b spikelet c glumes d lemmas and paleas e stem f node g ligule (https://doi.org/10.13140/RG.2.2.11621.41442).