. The Canadian field-naturalist. Natural history. 1997 Reddoch and Reddoch: The ORCfflDS in the Ottawa District 123 Platanthera hookeri (Torrey) Lindley Hooker's Orchid Synonym: Habenaria hookeri Torrey Platanthere de Hooker Platanthera hookeri is widely but thinly distributed in the forests of the District. Although it is one of the green orchids, its spiky, open inflorescence is often conspicuous above the bare forest floor. Like P. orbiculata and P. macrophylla, it has two conspicuous, round, basal leaves. It can be distinguished from these two species by its flowers, which are green or yel
. The Canadian field-naturalist. Natural history. 1997 Reddoch and Reddoch: The ORCfflDS in the Ottawa District 123 Platanthera hookeri (Torrey) Lindley Hooker's Orchid Synonym: Habenaria hookeri Torrey Platanthere de Hooker Platanthera hookeri is widely but thinly distributed in the forests of the District. Although it is one of the green orchids, its spiky, open inflorescence is often conspicuous above the bare forest floor. Like P. orbiculata and P. macrophylla, it has two conspicuous, round, basal leaves. It can be distinguished from these two species by its flowers, which are green or yellowish green instead of whitish. Its spurs taper to points and its lips are upturned. In addition, with rare exceptions, P. hookeri lacks cauline bracts. Description Height: 14 (22 - 33) 44 cm [129 plants]. Flowers: 2 (8 - 16) 25 [138 plants]; sepals deep green, petals, lip and spur greyish green or yellowish green sometimes tending to greenish yellow; fra- grance light, floral, by day. Leaves: 2, basal; 1 - 2 on non-flowering plants; either ascending or lying on the ground at anthesis, plants apparently maintaining the same orientation from year to year; dull to slightly lustrous; rarely 1 cauline bract, seen twice in the small colony at Mud Pond (see below) but nowhere else in the District. Overwintering State: a greyish green, broadly conical shoot, 1 - 2 cm above ground beside the cur- rent year's stem, appearing there in late September; herbarium specimens show the new shoot and par- tially elongated root usually present at anthesis. Capsules: greyish orange, brownish orange or dark brown, ellipsoid to obovoid, typically x cm, erect; yield usually less than 60%, averaging 30% [30 plants]; pollinators not known (Catling and Catling 1991) and often not very effective, especially in the Gatineau Park colony that we have monitored (see below); on two occasions we have found similar lepidopteran bristles and scales on the stigmatic sur- faces of flowers at different sit
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