Akkadian

mallaḫtu - a plant (CAD M₁ 169, AHw. 596)

Even if it is identical to Hbr. mallūaḥ, of uncertain meaning (let alone botanical identification), cf. Arb. malūḫiyyat-, with ḫ rather than ḥ. both rare and late and may well be a WS loanword if at all related to *milḥ- - salt

PWS
*milḥ- - salt (Fronzaroli 1971: 621, 634, 641; Kogan 2011: 239)
primary noun *milḥ- ‘salt’ is only marginally attested in EthS, cf. perhaps Gez. məlḥ(ā) ‘sapor, judicium, scientia’, extensively discussed in Bulakh 2005c:333‒334