Blue Sedge vs Tarheel Sedge

Although these species have little range overlap, they do overlap in eastern Virginia. They are closely-related and visually similar, and can be hard to tell apart. They can be reliably distinguished by the ratio of spike length to the number of seeds in each spike. C. pigra is less restricted to acidic soils and more likely to occur on moister sites, whereas C. glaucodea is restricted to acidic soils and occurs on sites that are drier on average.

References & External Resources

These short lists show only links helpful for ID. For a complete list of references and resources also covering other aspects of ecology, visit the links section of the full article on each plant, which is the first entry here.