Pl. 113 c, d; Map 463
E.
latifolia (L.) All.
Plants
with short rhizomes. Flowering stems 30–80 cm tall, pubescent with short,
crinkly hairs, with a usually 1‑sided raceme of 6–30 flowers. Leaves 3–7,
alternate on the flowering stems, grading into the reduced leaflike bracts
subtending the flowers, 3–10 cm long, ovate to lanceolate, green, glabrous or
nearly so. Sepals 6–10 mm long, ovate, green variously tinged with pink or
purple, the lateral sepals curved slightly downward. Lateral petals 6–10 mm
long, ovate, purple to pink or green. Lip 6–11 mm long, ovate, the basal half
pouchlike (holding nectar) and purple to brown, the apical half triangular and
somewhat recurved, green and tinged variously with pink or purple. Column 4–5
mm long, white. Stamen 1, staminodes lacking. Capsules pendant to spreading
downward, 10–16 mm long, broadly elliptic in outline, strongly ribbed. 2n=36–44.
June–September.
Introduced
in Jasper and St. Louis Counties (native to Europe, Asia, and northern Africa,
escaped from cultivation sporadically in North America, mostly in the
northeastern U.S.). Moist, shaded stream banks along limestone bluffs, and
disturbed, mesic, wooded areas near homes.
This
species is the only introduced orchid in Missouri. It has spread widely and
sporadically in the United State and adjacent Canada, becoming invasive in
forests around the Great Lakes. In Missouri it was first collected in 1928, and
a second population was only found in 1983 (Summers, 1981). The flowers are
pollinated by wasps and show relatively great variation in the degree of pink
to purple tinging.