Yellow lady's-slipper
General poisoning notes:
Yellow
lady's-slipper (Cypripedium calceolus) is a native perennial wild flower
found across Canada. The plant causes a type of dermatitis that resembles the
dermatitis caused by poison-ivy (Rhus
spp.). See additional information under general notes for Cypripediumacaule.
Description:
Plants 20-45 cm
tall, with a somewhat stout rhizome. Stem erect, with glandular hairs, with
several sheaths at base and 3 or 4 leaves above middle. Leaf blade elliptic or
ovate-elliptic, rarely ovate-lanceolate, 7-16 × 4-7 cm, abaxially sparsely
pubescent especially on veins and toward base, minutely ciliate, apex acute or
shortly acuminate. Inflorescence terminal, usually 1- or 2-flowered; floral
bracts foliaceous, elliptic-lanceolate or ovate-lanceolate, 4-6(-10) × 1.5-4
cm; pedicel and ovary ca. 3 cm, with short glandular hairs. Flowers with maroon
sepals and petals and yellow lip. Dorsal sepal ovate or ovate-lanceolate, 2.5-5
× 0.8-1.5 cm, abaxial midvein sparsely pubescent, apex acuminate or
cuspidate-acuminate; synsepal similar to dorsal sepal, apex shallowly 2-lobed.
Petals twisted, linear or linear-lanceolate, 3-5 × 0.4-0.6 cm, pubescent toward
adaxial base and on abaxial veins; lip deeply pouched, ellipsoid, 3-4 × 2-3 cm,
outside glabrous, inner bottom hairy; incurved lateral lobes 3-4 mm wide.
Staminode suboblong-elliptic, 7-10 × 5-7 mm, abaxially carinate, base with a
stalk ca. 1 mm, apex obtuse. Fl. Jun-Jul. 2n = 20.
Nomenclature:
Scientific Name: Cypripedium calceolus L.
Vernacular
name(s): yellow lady's-slipper, 杓兰
shao lan
Scientific family
name: Orchidaceae
Vernacular family
name: orchid
Geographic Information:
Alberta, British
Columbia, Labrador, Manitoba, New Brunswick, Newfoundland, Northwest
Territories, Nova Scotia, Quebec, Ontario, Saskatchewan.
Toxic parts:
Leaves, stems.
Toxic plant chemicals:
Cypripedin.
Animals/Human Poisoning:
Note: When an
animal is listed without additional information, the literature (as of 1993)
contained no detailed explanation.
Humans
General symptoms of
poisoning:
Blisters, weeping.
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