1	"Stems, and usually branches, spiny; plants shrubs and undershrubs"	2
1	"Stems and branches not spiny; plants herbs, shrubs, and undershrubs"	5
2	"Leaves petiolate; stigmas cylindrical; sepals glabrous or sparsely pubescent; seeds glabrous"	"Convolvulus leiocalycinus"
2	"Leaves sessile; stigmas linear or filiform; sepals hairy; seeds pubescent"	3
3	"Branching divaricate; flowers solitary, in the axils of bracteoles; pedicel bases flanked by spines on both sides; leaves not plicate"	"Convolvulus fruticosus"
3	"Branching not divaricate; flowers solitary or in cymes; pedicel bases not flanked by spines; leaves often plicate"	4
4	"Outer sepals 9-10 mm lonh, with long, sericeous, spreading hairs; corollas pink; stems and branches desnely sericeous, greyish green"	"Convolvulus acanthocladus"
4	"Outer sepals about 4 mm long, pubescent; corollas white; stems and branches appressed pubescent"	"Convolvulus spinosus"
5	"Leaf bases rounded, cordate, or hastate"	6
5	"Leaf bases usually cuneate or attenuate, sometimes a few auriculate"	10
6	"Stems twining or prostrate; leaves long-petiolate, glabrous or sparsely pubescent; seeds tuberculate"	"Convolvulus arvensis"
6	"Stems neither twining nor prostrate; leaves sessile to subsessile; seeds not tuberculate"	7
7	"Flowers solitary; ovaries hairy; plants annuals, cultivated"	"Convolvulus tricolor"
7	"Flowers 1 to many, in heads; ovaries glabrous; plants perennials, not cultivated"	8
8	"Leaves ovate to suborbicular; leaf margins undulate; inflorescences subsessile; branches rigid; seeds glabrous"	"Convolvulus scindicus"
8	"Leaves oblanceolate, lanceolate, or ovate-elliptic; leaf margins not undulate; peduncles up to 20 mm long; branches not rigid; seeds pubescent"	9
9	"Inflorescences with 3-6 flowers; sepals 10-14 mm long, tomentose; plants densely pale tomentose"	"Convolvulus pyrrotrichus"
9	"Inflorescences with 1-3(-5) flowers; sepals 4-7 mm long, villous; plants pubescent"	"Convolvulus prostratus"
10	"Stem bases not woody; plants, erect, diffuse, creeping, or sometimes twining herbs"	11
10	"Stem bases woody; plants usually erect, herbs, shrubs, and undershrubs"	15
11	"Inflorescences subsessile or shortly pedunculate heads; corollas completely glabrous"	"Convolvulus rhyniospermus"
11	"Inflorescences long pedunculate; corollas with pleats hairy on the outside, corolla tubes glabrous"	12
12	"Sepals glabrous, semi-membranous"	"Convolvulus stocksii"
12	"Sepals tomentoase to pilose, not membranous"	13
13	"Inflorescences with 4-10 flowers; bracts about 12 mm long, ovate; stigmas cylindrical; leaves sub-petiolate, the lower with attenuate bases, the upper with auriculate bases"	"Convolvulus glomeratus"
13	"Inflorescences with 1-3 flowers; bracts 5-8 mm long, lanceolate to oblanceolate; stugmas filiform; leaves sessile, with attenuate bases"	14
14	"Inner sepals ovate to ovate-lanceolate, acuminate; styles as long as the stigmas"	"Convolvulus piloselllifolius"
14	"Inner sepals obovate, caudate; styles 1.5-2 times as long as the stigmas"	"Convolvulus rottierianus"
15	"Flowers 1(-2) axillary"	16
15	"Flowers 1-many, in compact cymes or heads, axilllary or terminal"	17
16	"Branching divaricate; ovaries and styles hairy; sepals acute to subacute, appressed sericeous; leaves concentrated on the lower part of the plants"	"Convolvulus erinaceus"
16	"Branching broomlike, not divaricate; ovaries and styles glabrous; sepals obtuse, mucronate, glabrous; leaves present throughout the plants"	"Convolvulus pseudocantabricus"
17	"Leaves basally congested; flowers in subsessile cymes"	18
17	"Leaves not basally congested; flowers in pedunculate cymes"	20
18	"Ovaries and fruits pubescentl stems and leaves densely hairy, hairs yellow-white, patent and apprecced"	"Convolvulus aitchisonii"
18	"Ovaries and fruits glabrous; stems and leaves appressed sericeous, tomentose"	19
19	"Basal leaves wide and scarious at the base; bracts longer than the inflorescences; seeds puberulous"	"Convolvulus lineatus"
19	"No leaves wide and scarious at the base; bracts shorter than the inflorescences; seeds glabrous"	"Convolvulus kotschyanus"
20	"Ovaries glabrous; stigmas cylindrical seeds glabrous, tuberculate; leaves and branches glabrous or sparsely pubescent"	"Convolvulus virgatus"
20	"Ovaries hairy at the top; stigms filiforml seeds minutely pubescent; leaves and branches tomentellous"	"Convolvulus cephalopodus"