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Dowe Flats Supplemental Vegetation Studies
<br />June 1990
<br />ESCO ASSOCIATES INC.
<br />• delineation is being concurrently conducted by Aquatic end Wetland Consultants. Species present
<br />include Nebraska sedge (Carex nebrascensis), broom sedge (Carex scooarie), Baltic rush
<br />(Juncus arcticus ssp. halticus), interior rush (,Juncus interior), foxtail barley, tall fescue
<br />(Festuca arundinacea), and curly dock (Rumex crisous).
<br />Ri -Riparian forest. This type is confined to the immediate proximity of South St. Vrain
<br />Creek where the proposed transportaion corridor crosses. Dominant trees present include
<br />peachleaf willow (Selix emvodaloides), crack willow (Salix freoilis), boxelder (Acer neaundo),
<br />plains cottonwood (Pooulus deltoides), end narrowleaf cottonwood (Pooulus anaustifolie). Other
<br />tree species present include Russian olive (Eleaonus anaustifolie), sandbar willow (Selix
<br />exiaua), and New Mexico locust (Robinia neomexicana). Shrub species present include prickly
<br />rose (Rosa acicularis), Wood's rose (Rosa woodsii ), chokecherry (Pedus virainiane var.
<br />melanocarpa), wild plum (Prunus emericena), and snowberry (Svmohoricaroos cf.
<br />occidenialis). Perennial grasses and gresslikes present include mennagrass (Olvceria striata),
<br />Kentucky bluegrass (Poa agassizensis), reed canarygrass (Phalaris arundincaea), Nebraska
<br />sedge, broom sedge, and foxtail (Alooecurus oratensis). Perennial forbs present include spotted
<br />knapweed (Centaurea meculata), American speedwell (Veronica americena), willowherb
<br />(Eoilobium adenocaulon), bouncing bet (Seoonaria officinelis), field mint (Menthe arvensis),
<br />Canada thistle (Cirsium arvense), and cress (Rorioaa oalustrts ssp. hisoida). Annual (and
<br />biennial) forbs present include ragweed (Ambrosia sp.), musk thistle, and burdock (Arctium
<br />minus). Vines present include western virgin's bower (Clematis liausticifolia) and wild hops
<br />(Humulus luoulus).
<br />• WL -Wetland delineated during previous studies by Aquatic end Weiland Consultants (1987).
<br />LAND USE-DRIVEN VEGETATION TYPES
<br />DP -Dry Livestock Pasture. This unit consists of areas with various histories, united by the
<br />presence of dry, well-drained soils and periodic heavy livestock grazing disturbance. The
<br />dominant species reflect these conditions; they include the perennial grasses end gresslikes
<br />smooth brome (Bromoosis inermis ssp. inermis), Kentucky bluegrass, and sun sedge (Carex
<br />heliophila),the annual Braes cheatgress, perennial forbs hairy goldenasier (Heierotheca
<br />villasa), gumweed (Orindelie souerrosa), alfalfa (Mediceao saliva), spotted knapweed, and
<br />common bindweed, the annual (or biennial) forbs mullein and musk thistle, the shrubs rubber
<br />rahbiibrush (Chrvsothamnus neuseosus) and Wood's rose, end the succulent pricklypear cactus.
<br />IP -Improved Pasture. These areas have been planted to intermediate wheatgrass ( ro ron
<br />intermedium), orchardgrass (Dactvlis olomerata), and tall fescue in the recent pest. These
<br />species presently comprise a very productive vegetation cover, and may, on occasion, be mowed
<br />for hey, but otherwise provide livestock pasture.
<br />Hey -Lends Used for Hey Production. These areas, es indicated in ESCO (1987) may be
<br />dominated by smooth brome or by alfalfa, and are irrigatted for maximum forage production.
<br />C -Cultivated Lands. (see ESCO 1987).
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