土筆・つくし・どひつ・field horsetail
 土筆・つくし has two meanings, based on the same idea. 土筆 refers to field horsetail or equisetum arvense, a herbaceous perennial plant which looks  like a 筆・ ふで writing brush upside down or coming out of the 土・つち ground. 筆 shows a 手・て holding a brush and drawing a 一・いち line on paper. The lines on top 竹・たけ represent bamboo, which writing brushes were traditionally made of in China (compare with 書く to write).

The other meaning is a wooden stick with a burned tip, which comes from the practice of burning field horsetail or dipping it in watered ash and using it as a brush for sketches or drawing. When the horsetail is fertile it creates a nice little bushy tail that acts as a brush.

As far as readings go, it can be read as つくし or どひつ, つくし being from an older archaic version of つくづくし. The つくし reading is derived from 狂言・きょうげん a form of Japanese comic theatre, hence the special reading. 

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