north american native orchid journal - at The Culture Sheet

More documents

Recommendations

Info

Brown & Folsom: WILD ORCHIDS OF THE WHITE MOUNTAINS OF NEW HAMPSHIRE AND MAINE Listera convallarioides (Swartz) Nuttall broad-lipped twayblade forma trifolia P.M. Brown–3-leaved form Range: southwestern Alaska; British Columbia east to Newfoundland, south to California and Wyoming, east to northern Michigan and Maine In the White Mountains region: local in cool mountain wetlands Plant: terrestrial; 10 to 30 cm tall Leaves: 2; opposite, midway on the stem or, in the forma trifolia, 3 in a whorl, green, ovate-oblong 1-3 cm wide × 2.0-6 cm long Flowers: 5-15; in a terminal raceme; sepals and petals waterygreen, reflexed ; lip pale yellow-green, oblong, broadening to a shallowly notched at the apex; pedicles and ovary pubescent; individual flower size 0.6-1.5 cm Habitat: damp to wet cold, mossy woodlands, thickets, and river shores Flowering period: July The broad-lipped twayblade is the largest of the twayblades (Listera sp.) that we have in northeastern North America. The plants are almost always colonial and may form large patches usually in open damp woods, mossy glades, and on isolated little islets in flowing streams. When Listera auriculata is nearby the hybrid Listera ×veltmanii is almost always present. Listera convallarioides is often mistakenly called the broad-leaved twayblade when the correct common name is the broad-lipped twayblade referring to the decidedly broadened apex of the lip, unlike any other Listera in our region. These orchids required a rugged uphill climb over slipper rocks and boulders to reach their chosen niche on the steep sides of the mountain trail. The site was wet with streamlets and the little orchids hid easily amongst the grasses and water plants that were abundant in the area. 230
Brown & Folsom: WILD ORCHIDS OF THE WHITE MOUNTAINS OF NEW HAMPSHIRE AND MAINE Listera cordata (Linnaeus) R. Brown var. cordata heart-leaved twayblade forma viridens P.M. Brown–green-flowered form Range: Alaska east to Newfoundland and Greenland, south to California, and the Rocky Mts. in New Mexico; south to North Carolina in Appalachian Mts.; Eurasia In the White Mountains region: local and scattered Plant: terrestrial, 10-40 cm tall Leaves: 2 or, in the forma trifolia, 3 in a whorl or, in the forma tetraphylla, 4 in a whorl; opposite, mid-way on the stem, or, in the forma disjuncta, with an additional leaf above; green, or forma variegata, with white variegations; ovate 2.0 cm wide × 3.5 cm long with a somewhat cordate base Flowers: 5-40; in a terminal raceme; sepals purple, ovate, reflexed; petals purple, narrowly spatulate, strongly recurved; lip purple, linear, split beyond the middle into 2 slender filaments or, in the forma viridens, flowers entirely green; individual flower size 6-10 mm Habitat: damp, often dark, coniferous woodlands, trailsides, heaths, and sphagnum bogs Flowering period: June to August The heart-leaved twayblade is the most frequently encountered twayblade throughout the northern portion of our region. It often grows in great numbers and the variability in both leaf placement and flower color is usually evident. Although individual plants may be easy to overlook, these large colonies, when struck by the sun, seem to dance in the woodland floor. The individual flowers, like all of those in the genus Listera, are all lip with the petals and sepals pulled back around the ovary, well out of the way. 231
Page 1 and 2: NORTH AMERICAN NATIVE ORCHID JOURNA
Page 3 and 4: NORTH AMERICAN NATIVE ORCHID JOURNA
Page 5 and 6: Brown & Folsom: WILD ORCHIDS OF THE
Page 21 and 22: alba Brown & Folsom: WILD ORCHIDS O
Page 31: Brown & Folsom: WILD ORCHIDS OF THE
Page 69 and 70: 267
Page 71 and 72: from the swamps of SOUTH FLORIDA to
Page 73 and 74: 271

north american native orchid journal - at The Culture Sheet

Create successful ePaper yourself

Delete template?

Save as template?