Convolvulus suendermannii Bornm., Repert. Spec. Nov. Regni Veg. 43: 152. 1938. ( Bornmueller 1938: 152).

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 : 166-167

155. Convolvulus suendermannii Bornm., Repert. Spec. Nov. Regni Veg. 43: 152. 1938. ( Bornmueller 1938: 152).

Convolvulus boissieri subsp. suendermannii (Bornm.) Kuzmanov, Fl. Nar. Republ. Bulgariya 8: 451 (1982). ( Kuzmanov 1982: 451). Type. Based on Convolvulus suendermannii Bornm.

Type.

Plant from Bulgaria, Ali Botush Mountain, cultivated in Berlin, Sündermann s.n. (holotype B!).

Distinguishing features.

Intermediate between Convolvulus boissieri and Convolvulus lineatus . Stems short, ascending; leaves sessile, obovate to oblanceolate, acute, cuneate to a broad base.

Distribution.

Endemic to the area of Ali Botush Mountain, Bulgaria

Notes.

Convolvulus suendermannii is an interesting plant. We agree with Sa’ad (1967) that it has the appearance of Convolvulus lineatus but Bornmüller’s comment that it lies in "apparent midposition" between Convolvulus lineatus and Convolvulus compactus is readily understandable because of its dwarf habit so it is not difficult to see why Kuzmanov (1982) treated it as subsp. suendermannii of Convolvulus boissieri . It might well represent the hybrid Convolvulus lineatus × Convolvulus boissieri subsp. compactus . What adds to the interest is the type locality, which is precisely the same place where Stoïanov 868 was collected. This is the plant whose identity troubled Turrill and Stace (1971: 57). If this is indeed a hybrid or intermediate in some way between Convolvulus lineatus and Convolvulus boissieri subsp. compactus rather than a geographically anomalous population of Convolvulus boissieri subsp. boissieri , the geographical difficulties in Stace’s infraspecific classification of Convolvulus boissieri disappear. Some support for this view is provided by the presence of a distinct peduncle-like stem in the part of Stoïanov 868 preserved in the envelope of the specimen at Kew. While the leaves are clearly those of Convolvulus boissieri the inflorescence is thus atypical of that species and similar to that of the type of Convolvulus suendermannii . Another specimen ( Velčev et al. 711 (W, E) from nearby Slavjanka appears to be the same taxon. Careful field observation is necessary to confirm whether or not Convolvulus suendermannii is a hybrid. [ Strid 1991: 18-20].