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Bright yellow flowers along Tiburon Boulevard signal spring

Oxalis can be spotted all along Tiburon Boulevard. The plant grows from 4 inches to a foot tall and has five sepals and five-petaled flowers that bloom from spring to summer. (Joan Linn Bekins / For The Ark)

Mother Nature has been busy with her paintbrush along Tiburon Boulevard the past couple of weeks. Yellow is her color of choice. Perhaps you have noticed the patches of vividly bright yellow flowers growing in the disturbed soil along the roadside and above on the steep banks. This is Oxalis pes-caprae, affectionately called “sour grass” by children who like to chew the stem for its tangy flavor. Its leaves and stems are edible in small quantities, but like raw spinach and broccoli, it contains oxalic acid and can be harmful if too much is ingested. Cooks add a little to salads, soups, stews and desserts for a citrus, lemony flavor.

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