Images

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)

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)

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. (Scanned From Negative)

Decorative stand of the Pampas grass Cortaderia. (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)

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

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.

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)

USGS researchers collect samples of dust from a sealcoated parking lot for analysis of polycyclic aromatic hydrocarbons (PAHs).  PAH concentrations in dust swept from coal-tar-sealcoated parking lots are 100s to 1000s of times higher than those swept from parking lots with other types of surfaces.

Cory Emerson taking dissolved oxygen, temperature, and salinity readings from a potential relocation site for tidewater gobies in the Point Reyes National Seashore, CA.

The flower, leaves, and seed pods of a tiny but aggressive vine (Centrosema virginianum) growing beside a path in a central Florida woodland. (Scanned From Negative)

The flower, leaves, and seed pods of a tiny but aggressive vine (Centrosema virginianum) growing beside a path in a central Florida woodland. (Scanned From Negative)

Erythrina shows a cluster of its black seed pods with bright scarlet mature seeds lined up within. (Scanned From Negative)