Ehretia pranomiana sp. nov. (Boraginales: Ehretiaceae), a new scrambler from Thailand

Ehretia pranomiana sp. nov. is illustrated and described from northern and south-western Thailand. The new species is similar to E. macrophylla and E. acuminata by having elliptic leaves with a serrate margin, but can be distinguished by being a scrambling shrub with densely hispid leaf blades, corymbose inflorescence with 4-10 flowers, corolla with erect lobes and calyx longer than fruit at maturity. An updated identification key to the species of Ehretia known from Thailand is provided.