A group of these plants were growing on an embankment along an edge of parking lot.
The embankment had patches of bare soil, without a lot of other plants present.
Growing on edge of Alameda Creek , downstream from park HQ .
Equisetum arvense, the field horsetail or common horsetail, is a herbaceous perennial plant, native throughout the arctic and temperate regions of the northern hemisphere. It has separate sterile non-reproductive and fertile spore-bearing stems, growing from a perennial underground rhizomatous stem system. The fertile stems are produced in early spring and are non-photosynthetic, while the green sterile stems start to grow after the fertile stems have wilted, and persist through the summer until the first autumn frosts.