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IM <br /> 999 <br /> William F . Jennings <br /> 360 Martin Dr . RECEIVED <br /> Boulder , Colorado 80303 <br /> 303-494-5159 <br /> JUN 13 1991 <br /> July 22, 1986 <br /> Division of Minerals 8 Geology <br /> Dick Antonio <br /> Open Space Agricultural Manager <br /> Real Estate Services/Open Space <br /> 1405 S . Foothills Hwy <br /> Boulder , Colorado 80303 <br /> Dear Dick : <br /> At our last meeting, you requested information on the species of <br /> rare plants , of which I am aware, that are present in the city and <br /> county open space areas . I have personal knowledge of 11 rare species , <br /> but 1 am sure this is not an exhaustive list , and you should contact <br /> others who are informed of the botany of the area. <br /> Green Mountain : <br /> Malaxis brachypoda (Malaxis monophyllos var. brachypoda) . <br /> Observed several times since 1978 in the "Twin Springs" area <br /> of the Greenman Trail , north slope, Green Mountain. There <br /> are specimens at the University of Colorado, Denver Botanic <br /> Gardens , and University of Missouri from this locality. <br /> There are only two other locations in Colorado where this <br /> rare orchid has been found. In addition, in western North <br /> America, the only other known locations are in southern <br /> California, northern Canada, and Alaska. Undoubtedly the <br /> rarest orchid in Colorado. <br /> Listera convallarioides . Observed several times also in the <br /> "Twin Springs" area of the Greenman Trail , north slope, Green <br /> Mountain, often alongside the Malaxis . There are specimens <br /> from this locality at CU. Known in Colorado from only 3 <br /> other- sites , many specimens in the local herbaria were <br /> misidentifications of the similar orchid Listera borealis , <br /> formerly considered extremely rare. Listera convallarioides <br /> is more common in Canada, but in the western US, known from <br /> only a few scattered localities . Only two other orchids <br /> (Malaxis brachypoda and Spiranthes diluvialis) are rarer in <br /> Colorado. <br /> Corallorhiza striata. Observed regularly since 1974 along <br /> the Mesa Trail near Woods Quarry and occassionally elsewhere <br /> on Green Mountain. Not as rare as the above orchids , but <br /> still quite unusual (only 9 sites in Colorado) . There are <br /> specimens from this locality at CU. <br /> Piperia unalaschensis . Observed near the Woods Quarry along <br /> the Mesa Trail and near Green Mountain shelter house , north <br /> slope, Green Mountain . Also not extremely rare as orchids <br /> go, but very inconspicuous (only 12 sites in Colorado) and <br />