the specimen seems no different from many others of the species. 
Usually the flowers of this species are yellowish-green and may 
well contain both yellow and green pigments. A yellow-flowered 
form may thus have lost some or all of its green pigment in the 
floral parts, but in the present case the extent of the loss is 
impossible to determine. The plants we saw at the site were the 
normal form. Unfortunately, a storm sewer outlet had already 
destroyed much of the colony, and what was left has since 
disappeared. 
In closing, we would like to thank all the people named 
above who brought these fascinating plants to our attention. We 
would be interested to hear of other examples of distinct colour 
variation in Ottawa District orchids and in other species as 
well. We thank Paul Catling for his critical reading of the 
manuscript which helped us to clarify a number of points. Col¬ 
our photographs of the forms described have been deposited in 
the Agriculture Canada herbarium (DAO). 
Li terature Ci ted 
Brunton, D.F. 1985. Recent significant plant records from the 
Ottawa District Part II. Trail & Landscape 19(2): 99. 
Catling, P.M. 1982. New combinations for forms and varieties 
of some North American orchids. Naturaliste canadien 109: 
277-278. 
Dore, W.G. 1969. Pink Ladyslippers. Trail & Landscape 3(4): 
112-113. 
Fletcher, J. , H.B. Small and G. Baptie. 1888. Report of the 
Botanical Branch for the season of 1887. Ottawa Naturalist 
2(2): 23-25. 
Petrie, W. 1981. Guide to orchids of North America. Hancock 
House, North Vancouver, B.C. 128 pp. 
Reddoch, J. 1976. Large Purple Fringed-orchid: a new-old 
species. Trail & Landscape 10(5): 130-135. 
Reddoch, J. 1979. Favourite OFNC excursion places. Trail & 
Landscape 13(3): 71-96. 
Reddoch, J. 1980. Farewell to Niven's Woods. Trail & Land¬ 
scape 14(1): 6-7. 
Reddoch, J.M. and A.H. Reddoch. 1987. Notes on three Ottawa 
District orchids. Trail & Landscape 21(1): 18-26. 
Whiting, R.E. and P.M. Catling. 1986. Orchids of Ontario. The 
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79 
