Small, densely tufted Eleocharis looking plant, no vegetative stems. Culms up to 40cm tall, most smaller. Very shallow root system.
growing at the edge of a pond and would be in the pond if water levels were higher. I've seen this before but cannot identify.
BNP Soup bowl common. Not sure on species, but this is how it keyed for me with immature seeds (lenticular seed, cap and seed pale, cap a different texture with pretty distinct line).
Eleocharis obtusa is a species of spikesedge known by the common name blunt spikerush. This plant is widely distributed across Canada and the United States, where it grows in wet areas such as riverbanks and moist forest floors. It is also a weed of rice paddies, especially when the rice plants are young sprouts. This is an annual spikesedge approaching half a meter in maximum height. It has many green cylindrical stems which are erect but...