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 102 . Convolvulus oppositifolius Alfarhan, Bot. J. Linn. Soc. 106: 259. 1991. (Alfarhan 1991: 259). Figure 14, t. 1-7 Type. OMAN, Gallagher 6763/2 (holotype E00285430!). Description. Low undershrub from a woody base reaching c. 30 cm; stems densely tomentellous with white, spreading hairs, becoming stiff and rather woody when old and said to form a candelabra-shaped plant. Leaves alternate below but mostly opposite upwards, subsessile, 5-13 x 2-5 mm, elliptic or oblong-elliptic, apex acute to rounded, margin entire, base cuneate to truncate, glandular and hirsute with short spreading hairs on both surfaces; petioles 0-1 mm. Flowers 1-2 in small sessile, axillary clusters near the branch tips; peduncles and pedicels absent or nearly so; bracteoles 6 x 2 mm, oblong, acute; outer sepals 7-8 x 1.8-2 mm, lanceolate, acute, green near apex but membranous below, sericeous; inner sepals narrower (1.5-1.8 mm wide) with membranous margin; corolla 11-13 mm long, pinkish or "pale blue", midpetaline bands villous; ovary glabrous; style glabrous, divided c. 6 mm above base, stigmas short, clavate. Capsule glabrous, seeds minutely rugulose. Distribution. Endemic to Oman ( Miller 6492; Miller & Nyberg 9462, McLeish 3263; Hughes & Gallagher 7895/15, Popov 68/35, 68/46). Notes. Very distinct because of the short clavate stigmas and small, tomentose leaves arranged oppositely towards the branch tips. Some plants have very reduced leaves giving the plant a somewhat different facies (e.g., Popov 68/23, BM) and have been confused with Convolvulus hystrix .