. The Canadian field-naturalist. Natural history. 1997 Reddoch and Reddoch: The Orchids in the Ottawa District 119 Platanthera grandiflora (Bigelow) Lindley Large Purple Fringed-orchid Synonym: Habenaria fimbriata (Dryander) R. Brown Platanthere grandiflore Platanthera grandiflora is one of our most spectacular orchids, being both large and colourful. It is similar to the more common P. psycodes (Stoutamire 1974) with which it sometimes grows. These two species can be easily recognized by their numerous purple fringed flowers on a leafy stem. Platanthera grandiflora is distin- guished from P.
. The Canadian field-naturalist. Natural history. 1997 Reddoch and Reddoch: The Orchids in the Ottawa District 119 Platanthera grandiflora (Bigelow) Lindley Large Purple Fringed-orchid Synonym: Habenaria fimbriata (Dryander) R. Brown Platanthere grandiflore Platanthera grandiflora is one of our most spectacular orchids, being both large and colourful. It is similar to the more common P. psycodes (Stoutamire 1974) with which it sometimes grows. These two species can be easily recognized by their numerous purple fringed flowers on a leafy stem. Platanthera grandiflora is distin- guished from P. psycodes by having a large round entrance to the spur rather than a somewhat flattened one and by having anther sacs that diverge downward instead of being close and parallel. The former species also tends to have flowers nearly twice as large as the latter. Description Height: 33 (44 - 73) 97 cm [71 plants]. Flowers: 1 (12 - 34) 55 [87 plants], on average about three-quarters as many as on P. psycodes; gen- erally light lilac, pale violet or purple, occasionally deep violet or so pale as to be almost indistinguish- able from white (Petrie (1981) illustrates the latter colour on an Ottawa District plant), with white at base of lip and on column; spur translucent, often becoming pale violet sometimes with a trace of green toward tip; in a fairly dense, regular inflores- cence; fragrance light, sweet, daisy-like. Leaves: 3-5, with 2 - 5 bracts, 1 - 3 on non-flow- ering plants. Overwintering State: a greyish green, broadly to narrowly conical shoot, 1 - 4 cm above ground beside the current year's stem, appearing there in late September; herbarium specimens show the new shoot and partially elongated roots present at anthesis. Capsules: light brown, ellipsoid to oblong, typi- cally X cm, ascending to erect (see Figure Ic); yield highly variable, averaging 50% [10 plants]. Seeds: dark brown, released in mid to late September. 46°. 45° 76° 30 Platanthera grandiflora:
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