Rancho San Joaquin G.C., 9-12-13. © Ron Vanderhoff

Common Knotgrass

Polygonum aviculare

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O'Neil Reg Park, W ridge, 3-4-12. © Ron Vanderhoff
Maple Springs Rd., 8-26-12. © Ron Vanderhoff

Maple Springs Rd., 8-26-12. © Ron Vanderhoff
Maple Springs Rd., 8-26-12. © Ron Vanderhoff