1	"Plants with spinescent branches"	2
1	"Plants not spiny"	3
2	"Bracts 3-8 mm ling, 1-5 mm wide, more or less hiding the calyces"	"Convovulus hystrix"
2	"Bracts about 0.5 mm long, 0.3 mm wide, not hiding the calyces"	"Convolvulus verdcourtianus"
3	"Flowers on 2-10 mm long pedicels, in open to head-like cymes, the calyces not covered by the bracts"	4
3	"Flowers sessile in head-like cymes, the calyces more or less covered by the bracts"	8
4	"Plants shrubs or subshrubs, slender, erect, 0,5-3 m tall"	"Convolvulus sericophyllus"
4	"Plants annual or perennial herbs of various sizes, prostrate, ascending or erect or sometimes twining"	5
5	"Stems erect, with 2-3 mm long spreading hairs towards their bases"	"Convolvulus hildebrandtii"
5	"Stems prostrate, ascending or twinging, with shorter hairs"	6
6	"Plants annual; corollas about 6 mm long, more or less blue"	"Convolvulus siculus"
6	"Plants perennial; corollas 8-13 mm long, white or pale pink"	7
7	"Leaves with more or less sagittate bases and distinct petioles; plants twining"	"Convolvulus sagittatus"
7	"Leaves with cuneate bases; subsessile; plants not twining"	"Convolvulus prostratus"
8	"Plants shrubs or subshrubs"	9
8	"Plants annual or perennial herbs"	10
9	"Inflorescences sssile; leaves many"	"Convolvulus hystrix"
9	"Inflorescences on 0.5-6 mm long peduncles; leaves few and scattered"	"Convolvulus scopulatus"
10	"Inflorescences sessile or on peduncles up to 5 mm long or, if peduncles longer than 5 mm, leaves oblong-lanceolate and bracts up to 8 mm long"	"Convolvulus rhyniospermus"
10	"At least some inflorescences with peduncles longer than 10 m; leaves not oblong-lanceolate and/or bracts longer than 8 mm"	11
11	"Leaves 1-3 mm wide, more or less linear, with cuneate bases"	"Convolvulus stenocladus"
11	"Leaves 4-20 mm wide, lanceolate-oblong to suborbicular, with more or less truncate to cordate or hastate bases"	12
12	"Inflorescences with long, spreading hairs"	"Convolvulus glomeratus"
12	"Inflorescences with appressed, silvery or yellowish hairs"	"Convolvulus subspathulatus"