Last weekend, I floated down the Green River, from Little Hole to the mouth of Little Swallow Canyon, with the BLM and various other state and federal agencies on a Bio-Blitz. There were two reasons for the trip: to eradicate teasel, and to map populations of Ute Ladies’-Tresses.

Teasel is an invasive species, introduced to North America from Europe as early as the 1700s. The plants are rather attractive in a prickly way, and are sometimes used in flower bouquets. The stems were previously used in fabric production, the thorns being used to raise a nap on wool. A single plant can produce over 2,000 seeds with up to 80% viability, so the plants quickly overwhelm other species, creating a monoculture. There are still relatively few of the plants along the Green River. An attempt is being made to remove them before they become a serious problem. Mostly, we removed the flower-heads from the plants so that they could not produce seeds. Some of the younger plants were dug out and pulled. There are plans to continue removing seed-heads, and a possibility of spraying the plants.

The Ute Ladies’-Tress is a native orchid. As a threatened species, attempts are being made to determine the full size of its population and range. It is not an especially showy flower, particularly when compared to other orchids. They blend easily into the grasses and sedges around them. However, like most things, these flowers reward closer inspection. Rooted in sodden, sometimes submerged soil on the edge of the river, the plants we charted had a spike of white, waxy flowers, rarely over six inches tall. The shape of the flowers reminded me of dragon heads on Viking ships.

Many of the people I worked with were botanists. They told me the stretch of river we were working on was in relatively good shape, considering all that had happened there. Flaming Gorge Dam altered the flow of the river and amount of silt in the water from 1958 through the present. This adversely affected the Cottonwoods, who do not reproduce as well as they once did. Tamarisk, Teasel, Russian Olive, Phragmites Bull Thistle and a non-native vetch are common, but still controllable. On the other-hand there are also healthy numbers of Buffalo Berry, American Licorice, and willows. Along the portion we floated, there was only a short stretch of private property that was overgrazed. All that grew there were Tamarisks

One of the biologists mentioned that it is sometimes nice to go places that are completely unknown to him, so that he can look at the landscape and see the beauty of the place, instead of the number of invasive, non-native weeds.

While on the trip I saw many Prong-horn, Mule Deer, Ravens, Turkey Vultures, Mergansers, Leopard Frogs, Horned Larks and Gray Jays. Also I saw Osprey, a Golden Eagle, a Coyote, Canadian Geese, Sand-hill Cranes, big Rainbow and Brown Trout swimming beneath our raft through the clear water, and a Great Blue Heron who I startled on the edge of the river in the dark. Other members of the trip saw a family of seven river otters.