This is the Convolvulus minor of gardens.
Pharbitis hispida: hardy, 6 ft., various; the many-coloured twining Convolvulus major.
The large showy flowers are visited by insects for the honey which is secreted by a ring-like disk below the ovary; large Convolvulus sepium, slightly reduced.
Among the nine hundred species of Solanum less than a dozen have this property of forming tubers, but similar growths are formed at the ends of the shoots of the common bramble, of Convolvulus sepium, of Helianthus tuberoses, the so-called Jerusalem artichoke, of Sagittaria, and other plants.
Species of Ipomaea (morning glory), Convolvulus and Calystegia are cultivated as ornamental plants.
Several members of the order are used medicinally for the strong purging properties of the milky juice (latex) which they contain; scammony is the dried latex from the underground stem of Convolvulus Scarnmonia, a native of the Levant, while jalap is the product of the tubercles of Exogonium Purga, a native of Mexico.
Stachys, sp. not identified Anagallis collina, Schousb Convolvulus tricolor, L.