A foundation monograph of Convolvulus L. (Convolvulaceae) Author Wood, John R. I. Department of Plant Sciences, South Parks Road, University of Oxford, OX 1 3 RB, UK & Honorary Research Associate, Royal Botanic Gardens, Kew Author Williams, Bethany R. M. Department of Plant Sciences, South Parks Road, University of Oxford, OX 1 3 RB, UK & Department of Life Sciences, Natural History Museum, Cromwell Road, London SW 7 5 BD, UK Author Mitchell, Thomas C. Plant Biodiversity Research, Technische Universitaet Muenchen, Maximus-von-Imhof Forum 2, 85354 Freising, Germany Author Carine, Mark A. Department of Life Sciences, Natural History Museum, Cromwell Road, London SW 7 5 BD, UK Author Harris, David J. https://orcid.org/0000-0002-6801-2484 Royal Botanic Garden Edinburgh, 20 A Inverleith Row, Edinburgh EH 3 5 LR, UK Author Scotland, Robert W. Department of Plant Sciences, South Parks Road, University of Oxford, OX 1 3 RB, UK robert.scotland@plants.ox.ac.uk text PhytoKeys 2015 2015-06-18 51 1 282 http://dx.doi.org/10.3897/phytokeys.51.7104 journal article http://dx.doi.org/10.3897/phytokeys.51.7104 1314-2003-51-1 E76E3938E216FF804849B803C469FE14 576310 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, Suendermann 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 Bornmueller'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 x Convolvulus boissieri subsp. compactus . What adds to the interest is the type locality, which is precisely the same place where Stoianov 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 Stoianov 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 ( Velcev 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].