One more Stephen R Donaldsonism.

char·lock /ˈtʃɑrlək/

noun
a wild mustard, Brassica kaber, having lobed, ovate leaves and clusters of small, yellow flowers, often troublesome as a weed in grainfields.

[Origin: bef. 1000; ME cherlok, OE cerlic < ?]

Source: Dictionary.com.

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