This sort of growth has been popping up near landscape-imported small oaks
Two.
Third and fourth of four. Note two in one photograph.
RX10_42950, RX10_42951, RX10_42952, RX10_42953, RX10_42954, RX10_42955, RX10_42956, RX10_42957. Flowering.
Red Rock Canyon overlook area near Las Vegas, NV. Common today.