Wildflowers of North America…29 April 2011
695 views/ 25 January 2012
Location: Taken during a spring rain, in the marsh on the back porperty at the FortWhyte Nature Center, on the southwest edge of Winnipeg, Manitoba, Canada
Model: Canon EOS DIGITAL REBEL XTi Sigma APO 150mm Macro Lens, F stop: F/7.1 Exposure: 1/160 sec. Focal length: 150.0 mm Flash: flash did not fire, compulsory flash mode (16) Dimensions: 2400×1994 Shutter speed (Tv): 7.3 .
Yellow Lady’s Slipper, cypripedium calceo-lus L. var.pubescens, of the orchid family;
Flowers – one per stem or two, each subtended by an erect leaf like bract, sepals and lateral petals greenish-yellow to purplish brown. The lower yellow petal of flower is inflated to form a 2-6 cm (1 to 1.5 inch) pouch; (allowing insects to enter, but to exit out the rear where they collect pollen in the process), spirally twisted petals, 1.5-4 cm (5/8 to 1 1/2 inch) long, purple-veined and purplish dotted around the orifice. Flowering June-July.
Fruit: – dry, dark brown capsule with many seeds.
Leaves: Light green, ovate to lanceolate with sharp points, prominently veined, with few hairs, 5-15 cm (2 to 6 inches) long, up to 5 cm (2 inches) across.
Growing pattern – perennial, herb forb, nearly smooth, stem is about 12 cm (5 inches) long, reaching 15-40 cm (6 to 16 inches) tall.
Growth environment – edge of open spaces in aspen poplar woods or upper margins of sloughs, marshes, ditches and railway grades.
Information obtained from the book Wild flowers of Manitoba, by Ben W. Holyk.