Abstract. The most frequently used concepts from AGROVOC, CABT, and NALT -three major thesauri in the area of food and agriculture -have been merged into a Global Agricultural Concept Scheme, with 15,000 concepts and over 350,000 terms in 28 languages in its beta release of May 2016. This set of core concepts ("GACS Core") is seen as the first step towards a more comprehensive Global Agricultural Concept Scheme. In the context of a new Agrisemantics initiative, GACS is intended to serve as hub linking user-oriented thesauri with semantically more precise and specialized domain ontologies linked, in turn, to quantitative datasets. The goal is to improve the discoverability and semantic interoperability of agricultural information and data for the benefit of researchers, policy-makers, and farmers in support of innovative responses to the challenges of food security under conditions of climate change.

The genus Killickia is described to accommodate the South African endemic species formerly placed in Micromeria sect. Hesperothymus. Morphological data, as well as results from unpublished phylogenetic studies support its separation from the genera Micromeria and Clinopodium. A new species Killickia lutea Bräuchler is described and three new combinations are made. Killickia is characterised as comprising solitary-or few-flowered cymes, a campanulate to subcampanulate (obconical) calyx with similar teeth, a corolla tube with two pubescent ridges and nutlets with scattered minute hairs. A thickened marginal vein in the leaves as typical for Micromeria is absent. As currently understood all species are restricted to the Drakensberg mountains and KwaZulu-Natal Midlands in eastern South Africa. A key to the species, brief notes on anatomy and ecology are provided.

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