Second from left.
To left is S. faberi. To right is S. viridis, S. pumila.
This set of photos compares Carex bushii (left), C. caroliniana (middle), and C. hirsutella (right). This is the sequence from left to right for each photo.
herb; the last 6 photos contrast this species with the similar-looking C. grisea which was growing in the same field (C. grisea to the left, C. amphibola to the right)
Carex viridula featured on the right. This photo is a convenient comparison of three members of section Ceratocystis, all growing in association with one another on the mineral sand shorelines of an alkaline lake. Carex cryptolepis is in the middle; C. flava on the left.
L-R: Andropogon ternarius, Schizachyrium scoparium, A. gyrans, A. gerardii, A. virginicus
Comparison of Carex cephalophora (left) and Carex leavenworthii (right). The spikes are very similar, but the plants are different sizes and the perigynia are shaped differently.
A somewhat blurry but nonetheless useful side-by-side comparison of fruits between T. perfoliata and T. biflora. ID is for plant on the top (T. perfoliata).