Convolvulus hamadae (Vved.) Petrov, Byull. Moskovsk. Obshch. Isp. Prir., Otd. Biol., n.ser., 44: 132. 1935. (Petrov 1935: 132).

Wood, John R. I., Williams, Bethany R. M., Mitchell, Thomas C., Carine, Mark A., Harris, David J. & Scotland, Robert W., 2015, A foundation monograph of Convolvulus L. (Convolvulaceae), PhytoKeys 51, pp. 1-282 : 144-145

121. Convolvulus hamadae (Vved.) Petrov, Byull. Moskovsk. Obshch. Isp. Prir., Otd. Biol., n.ser., 44: 132. 1935. (Petrov 1935: 132).

Convolvulus subsericeus subsp. hamadae Vved., Byull. Sredne-Aziatsk. Gosud. Univ. 15 (Suppl.): 32. 1927. ( Popov and Vvedensky 1927: 32). Type. KAZAKHSTAN, Kara-tau, Popov 5/6/1926 (holotype TAK; isotypes B, BM!, E!, K!, LE!, P!, W!.)

Type.

Based on Convolvulus subsericeus subsp. hamadae Vved.

Description.

Erect undershrub, intricately branched from the base to at least 40 cm; stems, thinly sericeous. Leaves 1-5 × 0.2 cm, linear-oblong, acute, base tapering into a long pseudopetiole, thinly adpressed pubescent and appearing greenish. Flowers 1 (-2) at the apex of rigid, straight, relatively slender woody peduncles 0.8-1.5 cm long; bracteoles minute, linear, c. 1 mm, pedicels 0.5-1 mm, bent at 90° to peduncle; sepals (3-) 4 (-5) × 1.5 mm, narrowly oblong, acute, densely pubescent; corolla (8-)10 mm, white, unlobed, broadly infundibuliform, midpetaline bands pilose, terminating in a tooth; ovary pilose. Capsule pilose, seeds pubescent.

Distribution.

Kazakhstan (Drobov s.n. [3/8/1996], Krasheninnikov 158); Kyrgyzstan (Knorring 115, Drobov 246); Uzbekistan (Tishchenko 98, Muravliansky 1932, Knorring 60); Tajikistan (Nikitin 167, s.n. [19/6/1936], Knorring 129); Turkmenistan (Litvinow 1647, Sintenis 1285); Afghanistan (Aitchison 731); Iran (Pabot DK 518). Most common in Uzbekistan.

Notes.

The indumentum and corolla size suggests this lies between Convolvulus erinaceus and Convolvulus subsericeus or more probably Convolvulus eremophilus , given the distribution of the three species. It has a laxer, less rigid appearance than Convolvulus erinaceus with branches less divaricate, the corolla is longer and unlobed and the sepals are acute, not obtuse. From Convolvulus subsericeus it is distinguished by the shorter, pungent branches, flowers generally solitary and a little smaller, the sepals acute, not acuminate. From Convolvulus eremophilus it is distinguished by the sparse, adpressed indumentum of the stems and shorter corolla. A few specimens are completely glabrous, such as Botchantzev 468 from Uzbekistan, but seem to fit here best.

Sa’ad treated this species as a synonym of Convolvulus erinaceus but the sepals and corolla are quite different.