Chia belongs to the Labiatae or Lamiaceae family (mint family). It is an annual herb, normally about 1 m high, having branched quadrangular stems, and opposite leaves with a 40-mm petiole. The leaves are oval to oblong, almost smooth, with few pubescens that are whitish and very short. The leaves have serrated edges, and are 80—100 mm long by 40—60 mm wide. The flowers are produced in terminal or axillary spikes; the seeds are present in groups of four, and are a smooth, shiny, grayish-black color with irregular spots measuring 2 mm by 1.5 mm.
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