Chorizanthe biloba is a species of flowering plant in the buckwheat family known by the common name twolobe spineflower. It is endemic to California, where it is known only from the Central Coast Ranges. There are two varieties, both of which are uncommon to rare. The rare C. b. var. immemora, the Hernandez spineflower, is known from only about five occurrences near the border between San Benito and Monterey Counties. It is similar to var. biloba but has more shallow notches in its tepals.