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 141. Convolvulus argyracanthus Rech.f., Aellen & Esfand., Anz. Oesterr . Akad. Wiss., Math.-Naturwiss. Kl. 87: 303. 1950. (Rechinger et al. 1950: 303). Figure 18, t. 34-41 Type . Iran, K.H. Rechinger et al. 3228 (holotype W!; isotypes E!, G, K!). Description. Grey spiny undershrub to 60 cm, stems grey-sericeous, spinescent, lateral spines formed from dead peduncles present near branch tips. Leaves sessile, 1-1.7 x 0.3-0.6 cm, obtuse, margin entire, base attenuate, grey-sericeous. Flowers solitary (or, fide Sa'ad (1967) , 2-3 in axillary diachasia), axillary, pedunculate; bracts leaf-like; peduncles 3-4 mm, woody; bracteoles c. 1.5 mm, linear, obtuse; pedicels 1.2 mm long, bent at an angle to the peduncle; sepals all similar, 3-6 x 2-4 mm, obovate, mucronulate, abruptly narrowed at base, adpressed-pilose; corolla 1.6-2.2 cm, white with slight bluish flush, weakly lobed, midpetaline bands pilose; ovary pilose, style pubescent, divided c. 7 mm above base, stigmas 3 mm; capsule and seed not known. [ Sa'ad 1967 : 63; Rechinger 1963 : f. 2] Distribution. Iran: Kerman, Fars ( Davis & Bokhari 56223, Grey-Wilson & Hewer 301, Popov 51/75, Foroughi 10731). Notes. Resembles Convolvulus spinosus but most easily distinguished by the obovate leaves and all five sepals equal in size and shape.