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 123 . Convolvulus divaricatus Regel & Schmalh., Trudy Imp. S.-Petersburgsk. Bot. Sada 6: 338. 1879. (Regel 1879: 338). Figure 17, t. 1-7 Convolvulus deserticulus Podlech, Mitt. Bot. Staatssammel. Muenchen 17: 482. 1981. ( Podlech 1981 : 482). Type. AFGHANISTAN, Kandahar, Podlech 30744 (holotype M; isotype W!). Convolvulus afanassievii Luferov, Kumarovia 1: 59. 1999. ( Luferov 1999 : 59). Type. UZBEKISTAN, Kzyl-Kum, Afanassiev 238 (holotype LE!; isotypes LE!). Type. UZBEKISTAN, Chiwa (Khiva), Koralkov s.n. (holotype LE!). Description. Perennial undershrub from a woody rootstock forming a small bush; stems numerous to 50 cm, rigid and woody below, herbaceous above, slightly divaricate, densely grey-pilose. Basal leaves not seen; stem leaves sessile, 0.3-1.5 x 0.3-1.5 cm, very variable in size from plant to plant, oblanceolate, lanceolate, ovate or suborbicular, acute, entire to somewhat undulate, basally cuneate to rounded, pilose. Flowers 1-3 (- 5) in axillary dichasial cymes but often solitary; peduncle 0.5-6 cm, somewhat terete to rigid; bracteoles 3 mm, filiform; pedicels 2-10 mm; outer sepals 5-6 x 2.5 mm, lanceolate, ovate or elliptic, acuminate or caudate, densely lanate; inner sepals broader (c. 3 mm), glabrous; corolla 1.1-1.3 (-1.5) cm long, cream or pinkish, unlobed, midpetaline bands darker, pilose, terminating in a tooth; ovary glabrous or with a few apical hairs; style glabrous, divided c. 2 mm above base, stigmas c. 2 mm; capsule glabrous, 1-seeded (?always); seeds hirsute. [ Sa'ad 1967 : 89] Figure 17. 1-7 Convolvulus divaricatus 1 leaves 2 bracteole 3 outer sepal 4 middle sepal 5 inner sepal 6 stamen 7 ovary and style. From Drabov 287 (B) 8-14 Convolvulus gracillimus 8 flowering branch 9 leaf 10 outer sepal 11 middle sepal 12 inner sepal 13 stamen 14 ovary and style. From Rechinge r 16080 (W) 15-20 Convolvulus sarothrocladus 15 leaves 16 outer sepal 17 middle sepal 18 inner sepal 19 stamen 20 ovary and style 15 from sin coll . (JE) 16-20 from Haussknech t s.n. (W) 21-26 Convolvulus pseudocantabrica subsp. askabadensis 21 leaves 22 outer sepal 23 middle sepal 24 inner sepal 25 stamen 26 ovary and style. From Gauba 1623 (B) 27-33 Convolvulus ammannii 27 leaf 28 outer sepal 29 inner sepal 30 stamen 31 ovary and style 32 sepals and capsule 33 seeds. From Hsia 20/7/1931(K) 34-37 Convolvulus xanthopotamicus 34 shoot showing woody stem and branching 35 leaf 36 outer sepal 37 inner sepal. From Purdom s.n. (K). Distribution. Uzbekistan/Kazakhstan: Kzyl-Kum ( Knorring 155, Rodin & Arkadyev 213, Rodin et al. 634); Turkmenistan ( Dubiansky s.n. [9/5/1925], Petrov s.n. [10/5/1930], Litwinow 1425); Tajikistan ( Korshinsky 7298); Afghanistan ( Hewer 1060, Furse 5574, Rechinger 34194b). Common in sandy deserts. Notes. Distinctive because of the pilose indumentum with spreading hairs combined with the lanceolate to ovate stem leaves but very close to Convolvulus subsericeus and Convolvulus eremophilus . From the latter it is best distinguish by the less rigid, less flexuouse branches arising at around 60° from the stem as well as the broader leaves. Specimens intermediate between Convolvulus divaricatus and Convolvulus eremophilus exist ( Grigoriev 1953 : 19) and have been called Convolvulus michelsonii (V. Petrov) V. Petrov ex Grigoriev (1953 : 19) or Convolvulus korolkowii var. michelsonii V. Petrov (1935 :136), the type being Michelson s.n. [29/5/1914] (holotype LE) from the Kyzyl-Kum desert in Uzbekistan. However, their status is uncertain and they may be hybrids. Examples include Litwinow 873a (LE) from Turkmemistan.