Common name: white horehound
Marrubium vulgare L. APNI*
Description: Perennial shrub to 60 cm high; branches erect, many-branched from near base; indumentum greyish to white, dense.
Leaves with lamina rhombic-ovate to circular, 1–3.5 cm long, 0.8–3 cm wide; apex rounded; base truncate to ± cordate; margins ± deeply toothed, teeth rounded; upper surface reticulate-wrinkled; indumentum greyish to white, dense; petiole 14–20 mm long.
Inflorescence with dense clusters of > 12 flowers per leaf axil; peduncle distinct. Calyx tube 4–7 mm long, hairy; lobes reduced to 10 hooked spines, glabrous. Corolla 6–12 mm long, white.
Flowering: throughout year.
Distribution and occurrence: Grows in disturbed sites, common along roadsides, on farms and in waste areas in towns. Native of Eur. & northern Afr.
NSW subdivisions: *NC, *CC, *SC, *NT, *CT, *ST, *NWS, *CWS, *SWS, *NWP, *SWP, *NFWP, *SFWP
Other Australian states: *Qld *Vic. *Tas. *S.A.
Declared Noxious Weed
Text by B. J. Conn
Taxon concept: Flora of NSW 3 (1992)
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.