Images

USGS employee showing the rhizosphere (root zone) of a wetland plant, which is a critical zone for microbiological and biogeochemical processes.

USGS researcher, Dr. Windham-Myers, collecting a white rice sample after 2 months of growth.

Cliff dwelling known as Square Tower House in Mesa Verde National Park. (Scanned From Negative)

A diversity of birds forage for small fish and invertebrates on fallow fields throughout the year.

The leaves, buds, tendrils, and flowers of a passion flower vine (Passiflora). (Scanned From Negative)

The leaves, buds, tendrils, and flowers of a passion flower vine (Passiflora). (Scanned From Negative)

The leaves, buds, tendrils, and flowers of a passion flower vine (Passiflora). (Scanned From Negative)

The leaves, buds, tendrils, and flowers of a passion flower vine (Passiflora). (Scanned From Negative)

The leaves, buds, tendrils, and flowers of a passion flower vine (Passiflora). (Scanned From Negative)

Snake cactus that has wrapped itself about the trunk of a Sabal palm on the Gulf coast of Florida. (Scanned From Negative)

The leaves, buds, tendrils, and flowers of a passion flower vine (Passiflora). (Scanned From Negative)

Leaves and purple flowers of a railroad vine (beach morning-glory) as it colonizes the sands of a coastal dune on a Gulf coast barrier island.

Leaves and purple flowers of a Morning-glory as it colonizes the sands of a coastal dune on a Gulf coast barrier island. (Scanned From Negative)

Leaves and purple flowers of a railroad vine (beach morning-glory) as it colonizes the sands of a coastal dune on a Gulf coast barrier island.

Leaves and purple flowers of a railroad vine (beach morning-glory) as it colonizes the sands of a coastal dune on a Gulf coast barrier island. (Scanned From Negative)

Leaves and purple flowers of a railroad vine (beach morning-glory) as it colonizes the sands of a coastal dune on a Gulf coast barrier island

Leaves and purple flowers of a railroad vine (beach morning-glory) as it colonizes the sands of a coastal dune on a Gulf coast barrier island. (Scanned From Negative)

The leaves and flowers of the popular tropical tree, Plumeria. This specimen in Florida has been employed as a landscape ornamental. (Scanned From Negative)

Decorative stand of the Pampas grass Cortaderia. (Scanned From Negative)

One of the largest living gumbo limbo trees (Bursera simaruba).

Subalpine meadow near Deer Park campground on the Olympic Peninsula in Washington.