Cover illustration: The inset cover image shows plants of Tecticornia medusa at Fortescue Marsh, north-western Australia (photograph by Louis Moir-Barnetson). The genus Tecticornia contains perennial, halophytic stem-succulent (i.e. reduced and fused leaves) species and many grow at ephemeral inland salt lakes; environments characterized by high soil salinity and episodic flooding punctuated by periods of drought. The high submergence tolerance of T. medusa is not associated with good internal aeration of stems, and in fact when submerged in water at air-equilibrium, the stems are severely hypoxic (close to anoxic) when in darkness. See Konnerup et al. (pp. 409–418).