Herbs annual or perennial, aromatic, often rhizomatous or stoloniferous. Upper leaves sessile or subsessile; blade margin dentate, serrate, or crenate. Verticillasters (2-6)- to many flowered; floral leaves similar to stem leaves or reduced; bracts lanceolate to linear, ± distinct. Flowers bisexual or pistillate. Calyx funnelform to campanulate, 10-13-veined, throat glabrous or hairy, limb equally 5-toothed or 2-lipped, upper lip 3-toothed, lower lip 2-toothed. Corolla funnelform, ± regular or slightly irregular; tube generally included, throat slightly dilated or saccate in front, limb 4-lobed; lobes equal, entire, upper lobe slightly wider, emarginate or 2-lobulate. Stamens 4, subequal, divaricate, erect, exserted in bisexual flowers, included and often rudimentary in pistillate flowers, posterior 2 slightly longer than anterior 2; filaments glabrous; anther cells 2, parallel. Style exserted, apex equally 2-cleft. Nutlets ovoid, dry, smooth or slightly tuberculate, apex rounded, rarely hairy. Cal 10–13-nerved, regular or weakly 2-lipped, the broadly triangular to subulate teeth equal or unequal; cor with short tube and nearly regularly 4-lobed limb, the upper lobe formed by fusion of 2, tending to be broader than the others and often apically emarginate, rarely and casually the cor equally 5-lobed; stamens 4, straight, somewhat divergent, exsert, about alike, the pollen-sacs parallel; rhizomatous perennial herbs with toothed, wholly cauline lvs and small, blue to lavender or white fls in the axils of lvs or in terminal "spikes" or heads. Many spp. produce small-fld pistillate plants as well as normal perfect-fld ones. Ca 25 spp., mainly of Eurasia and Australia, 1 circumboreal. The European spp., long in cultivation, have given rise through hybridization, polyploidy, and other kinds of chromosomal aberration to numerous ± stabilized additional populations that have become established in the wild as well as being retained in cult. Herbs annual or perennial, aromatic, often rhizomatous or stoloniferous. Upper leaves sessile or subsessile; blade margin dentate, serrate, or crenate. Verticillasters (2-6)- to many flowered; floral leaves similar to stem leaves or reduced; bracts lanceolate to linear, ± distinct. Flowers bisexual or pistillate. Calyx funnelform to campanulate, 10-13-veined, throat glabrous or hairy, limb equally 5-toothed or 2-lipped, upper lip 3-toothed, lower lip 2-toothed. Corolla funnelform, ± regular or slightly irregular; tube generally included, throat slightly dilated or saccate in front, limb 4-lobed; lobes equal, entire, upper lobe slightly wider, emarginate or 2-lobulate. Stamens 4, subequal, divaricate, erect, exserted in bisexual flowers, included and often rudimentary in pistillate flowers, posterior 2 slightly longer than anterior 2; filaments glabrous; anther cells 2, parallel. Style exserted, apex equally 2-cleft. Nutlets ovoid, dry, smooth or slightly tuberculate, apex rounded, rarely hairy. Cal 10–13-nerved, regular or weakly 2-lipped, the broadly triangular to subulate teeth equal or unequal; cor with short tube and nearly regularly 4-lobed limb, the upper lobe formed by fusion of 2, tending to be broader than the others and often apically emarginate, rarely and casually the cor equally 5-lobed; stamens 4, straight, somewhat divergent, exsert, about alike, the pollen-sacs parallel; rhizomatous perennial herbs with toothed, wholly cauline lvs and small, blue to lavender or white fls in the axils of lvs or in terminal "spikes" or heads. Many spp. produce small-fld pistillate plants as well as normal perfect-fld ones. Ca 25 spp., mainly of Eurasia and Australia, 1 circumboreal. The European spp., long in cultivation, have given rise through hybridization, polyploidy, and other kinds of chromosomal aberration to numerous ± stabilized additional populations that have become established in the wild as well as being retained in cult.General Information
Source: [
Source: [
Flora of China @ efloras.org
General InformationManual of Vascular Plants of Northeastern US and Canada
General Information
