Listera cordata (L.) R. Br.
heart-leaved twayblade (heartleaf twayblade)
Orchidaceae (Orchid family)

Introduction to Vascular Plants

Photograph

© Rod Innes     (Photo ID #6654)


Map

E-Flora BC Static Map

Distribution of Listera cordata
Click here to view the full interactive map and legend

Species Information

General:
Perennial herb from slender rhizomes, with fibrous roots; stems 7-25 cm tall, with 2 leaves, smooth or slightly hairy above.
Leaves:
Two, usually below middle of stem, opposite, broadly egg- to kidney-shaped, 1-4 cm long, 1-4 cm wide, smooth, heart-shaped at base, abruptly pointed at tip.
Flowers:
Inflorescence a few- to several-flowered, terminal raceme, the flowers yellowish-green to pur plish or maroon; sepals 2-3 mm long, egg-shaped; petals similar to sepals, 1.5-2.5 mm long; lip 3-6 mm long, linear to oblong, deeply cleft into 2 linear-lanceolate lobes, with 2 awl-like teeth at base; column 0.5-1.5 mm long.
Fruits:
Capsules, spreading, egg-shaped, 4-6 mm long.
Notes:
Some authors have recognized two varieties, the northwest cordilleran var. nephrophylla and the widespread, circumboreal var. cordata, based on leaf size and flower colour and size. But we concur with Calder & Taylor (1968) that there is significant overlap in these characters and in the range of the forms, thus distinct taxa are not warranted.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Ecology

Ecological Framework for Listera cordata

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Avg

Min

Max

Elevation (metres)
943 0 2500
Slope Gradient (%)
22 0 350

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

350 0 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 0 8
Modal Nutrient Regime
Class
C
# of field plots
 species was recorded in:
4758
Modal BEC Zone Class
CWH

All BEC Zones (# of stations/zone) species was recorded in

BWBS(88), CDF(2), CWH(1497), ESSF(1399), ICH(536), IDF(20), MH(213), MS(151), SBPS(17), SBS(625), SWB(18)

Habitat and Range

Moist forests, bogs and thickets in the lowland to subalpine zones; common throughout BC, except infrequent north of 56 degrees N; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, PA, NC, MI, WI, MN, NM, UT, NV and CA; Eurasia.

SourceThe Illustrated Flora of British Columbia