Convolvulus chinensis subsp. triangularis 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 : 52

5 b. Convolvulus chinensis subsp. triangularis J.R.I.Wood & R.W.Scotland subsp. nov.

Diagnosis.

A subsp. typo habitu suberecta et foliis triangularibus.

Convolvulus arvensis var. erectus Ledeb., Fl. Altaic. [Ledebour] 1: 224. 1829. ( Ledebour 1829: 225).

Type. RUSSIA, Altai, Tiuguriuk stream by Katunja River (LE, not seen).

Type.

KAZAKHSTAN, "in rupestribus montium Tarbagatai ad torrentium Dschanybek", Karelin & Kiriloff 328 (holotype LE ex Herb Ledebour!; isotypes BM001035796!, LE ex herb. Fischer!, LE ex herb. Schrenk!, P!).

Distinguishing features.

Distinguished by its suberect habit and triangular leaves, c. 3-5 × 1.5-4 cm.

Distribution.

Russia: Siberia (Salefov 794, 806 (sin data), Mardovkin s.n. ("Siberia altaica"), Kazakhstan (Karelin & Kiriloff 597 ("Tarbagatai ad torrentium Dschanybek"), Roldugin s.n. [12/8/1960] "Dzungarsky Alatai"), Schrenk s.n. ( “Songaria”). Apparently rare.

Notes.

Convolvulus chinensis is most reliably distinguished from Convolvulus arvensis by the longer sepals. Additionally the auricles are often bifid, the central lobe oblong and the corolla usually deep pink and slightly larger than in Convolvulus arvensis . It is often considered to be a form of Convolvulus arvensis but intermediates are uncommon, mainly being found in the Tibet region, and could be of hybrid origin. Molecular studies ( Williams et al. 2014) strongly support the recognition of Convolvulus chinensis as a distinct species.