Convolvulus calvertii subsp. ruprechtii (Boiss.) J.R.I.Wood & R.W.Scotland, 2015

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 : 163-164

151b. Convolvulus calvertii subsp. ruprechtii (Boiss.) J.R.I.Wood & R.W.Scotland stat. nov.

Convolvulus ruprechtii Boiss., Fl. Orient. [Boissier] 4: 96. 1875. ( Boissier 1875b: 96). Type. RUSSIA, Daghestan, Ruprecht s.n. (lectotype G 00330221!, specimen from "Daghestania prope Kutuschi," designated here; isolectotypes G!, LE).

Type.

Based on Convolvulus ruprechtii Boiss.

Distinguishing features.

Leaves and stem silvery with appressed sericeous hairs; spreading hairs absent or almost so. Leaves broadly oblong to obovate, up to three times as long as broad. Petrov 1935: 144 (plate).

Distribution.

Crimea (Vasak s.n. [29/7/1977]); Russia: Dagestan (Tsvelev et al. 1020, 2850, 3164, Alexeenko 952, 9355, Grossheim s.n. [25/6/1915]); Armenia (Fayvush et al. 04-0424); Azerbaijan (Grossheim et al. s.n. [10/6/1947]); Iran (Miller et al. s.n. [17/5/2005]). Principally in the eastern Caucasus around 1500 m.

Notes.

Convolvulus calvertii is recognised by the near sessile flowers with bracts often overtopping the heads are distinctive. It is easily confused with Convolvulus commutatus and Convolvulus schirazianus but is distinguished by the distinct spreading hairs on the stem. Convolvulus lanuginosus differs in the pilose ovary and Convolvulus sericocephalus in the sparse indumentum of the inflorescence so the sepals are easily visible.