The fruit, when dry, usually splits open forcefully, effectively scattering the seeds. I have heard stories of walking along the trails on Montara Mountain while the Lupine are popping, but have yet to experience this. On Montara Mountain, particularly bothersome invasives include Bird's Foot Lotus and the infamous French Broom , species that are so aggressive they inhibit any native vegetation from re-establishing in disturbed areas.
Elimination is advised.
Fabaceae is well represented on Montara Mountain. Three petaled, clover like but wthout any distinct markings. Grassy areas, disturbed sites at lower elevations. Also, observed along Highway 1 along the San Mateo County MidCoast area. April - June.