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Published In: Species Plantarum 1: 153. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Contributor Institution: National Herbarium, Agricultural Research Council, Islamabad. ( Now at Newnham College, Cambridge, England.)
General/Distribution: A cosmopolitan genus of c. 250 species, mostly temperate and subtropical in distribution, rare in the tropics. Represented in Pakistan by 21 wild and cultivated species.


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Shrubs, subshrubs or herbs, erect, prostrate or twining, spinous or not. Leaves simple, alternate, entire or lobed, often pubescent. Flowers bracteate, in terminal or axillary cymes, involucrate heads or solitary. Sepals free, equal or subequal. Corolla usually campanulate. Filaments epipetalous, usually unequal, gradually subulate. Ovary 2-4-locular, style single, stigmas 2, filiform, linear, or cylindrical. Fruit a capsule, glabrous or pubescent. Seeds 1-4, smooth or tuberculate, glabrous or pubescent.

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1 Stems and usually the branches spiny. Shrubs and undershruhs (2)
+ Stems and branches not spiny. Herbs, shrubs and undershruhs (5)
2 (1) Leaves sessile. Stigma linear or filiform. Sepals hairy. Seeds pubescent (3)
+ Leaves petiolate. Stigma cylindrical. Sepals glabrous to sparsely pubescent. Seeds glabrous 2 Convolvulus leiocalycinus
3 (2) Branching not divaricate. Flowers solitary or in cymes, the pedicel not flanked by spines. Leaves often plicate (4)
+ Branching divaricate. Flower 1, the pedicel flanked by spines on either side in the axils of bracteoles. Leaves not plicate 4 Convolvulus fruticosus
4 (3) Outer sepals 9-10 mm long, with long sericeous, spreading hairs. Corolla pink. Stems and branches densely sericeous, greyish-green
+ Outer sepals 3 mm long, pubescent. Corolla white. Stems and branches appressed pubescent 3 Convolvulus spinosus
5 (1) Leaf base rounded, cordate or hastate (6)
+ Leaf base cuneate or attenuate (sometimes a few leaves auriculate in C. glomeratus and C. virgatus) (10)
6 (5) Stems not prostrate or twining. Leaves sessile to subsessile. Seeds not tuberculate (7)
+ Stems prostrate and twining. Leaves long petioled, glabrous to sparsely pubescent. Seeds tuberculate 20 Convolvulus arvensis
7 (6) Flowers 1-many, in heads. Ovary glabrous. Perennials, not cultivated (8)
+ Flowers solitary. Ovary hairy. Cultivated annuals 21 Convolvulus tricolor
8 (7) Leaves oblanceolate, lanceolate or ovate-elliptic, margin entire. Peduncles up to 20 mm long. Seeds pubescent. Branches not rigid (9)
+ Leaves obovate to suborbicular, margin undulate. Flower heads subsessile. Seeds glabrous. Branches rigid 8 Convolvulus scindicus
9 (8) Flowers 3-6, sepals 10-14 mm long, tomentose. Plant densely pale tomentose
+ Flowers 1-3(-5), sepals 4-7 mm long, villous. Plant pubescent 15 Convolvulus prostratus
10 (5) Stem base not woody. Erect, diffuse, creeping or sometimes twining herbs, (17)
+ Stem base woody. Usually erect herbs, shrubs and undershrubs (11)
11 (10) Flowers 1(-2), axillary (12)
+ Flowers 1-many, in compact cymes or heads, axillary, or terminal (13)
12 (11) Branching divaricate. Ovary and style hairy. Sepals acute to subacute, appressed sericeous Leaves mostly in the lower part of the plant 5 Convolvulus erinaceus
+ Branching broom-l ike, not divaricate. Ovary and style glabrous. Sepals obtuse, mucronate, glabrous. Leaves present throughout the length of the plant 6 Convolvulus pseudocantabricus
13 (11) Leaves basally congested. Flowers in subsessile cymes (14)
+ Leaves not basally congested. Flowers in pedunculate cymes (16)
14 (13) Ovary and fruit pubescent. Stem and leaves densely hirsute, hairs yellow-white, patent and appressed
+ Ovary and fruit glabrous. Stem and leaves appressed sericeous, tomentose (15)
15 (14) Leaves not wide nor scarious at the base. Bracts shorter than the inflorescence. Seeds glabrous
+ Basal leaves wide and scarious at the base. Bracts longer than the inflorescence. Seeds puberulous 9 Convolvulus lineatus
16 (13) Ovary glabrous, stigma cylindrical. Seeds glabrous, tuberculate. Leaves and branches glabrous to sparsely pubescent
+ Ovary hairy at top, stigma filiform. Seeds minutely pubescent. Leaves and branches to-mentellous
17 (10) Heads long pedunculate. Corolla with hairy plaits on the outside, tube glabrous (18)
+ Flowers in subsessile or shortly pedunculate heads. Entire corolla glabrous 19 Convolvulus rhyniospermus
18 (17) Sepals tomentose to pilose, not membranous (19)
+ Sepals semi-membranous, glabrous 18 Convolvulus stocksii
19 (18) Flowers 1-3, bracts 5-8 mm long, lanceolate to oblanceolate. Stigma filiform. Leaves sessile, attenuate (20)
+ Flowers 4-10, bracts 12 mm long, ovate. Stigma cylindrical. Leaves sub-petiolate, the upper auriculate, lower attenuate 16 Convolvulus glomeratus
20 (19) Inner sepals obovate, caudate. Style 1.5-2 times the length of stigma
+ Inner sepals ovate to ovate-lanceolate, acuminate. Style as long as the stigma 14 Convolvulus pilosellifolius

Lower Taxa
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