ORCHID FAMILY. 473 
1. Listera convallarioides (Sw.) Torr. Broad-lipped Twayblade. 
(Fig. 1128.) 
Epipactis convallarioides Sw. Kongl. Vet. Acad. Handl, 
(II.) 21: 232. 1800. 
Listera convallarioides Torr. Comp. 320. 1826. 
Stem 4/-10’ high, glandular-pubescent above the 
leaves. Leaves smooth, round-oval or ovate, obtuse 
or cuspidate at the apex, sometimes slightly cordate 
or reniform at the base, 3-9-nerved. Raceme 114/—3/ 
long, loosely 3-12-flowered; flowers greenish yellow, 
pedicels filiform, bracted, 3/’-4’’ long; petals and 
. sepals linear-lanceolate, much shorter than the lip; 
lip broadly wedge shaped, with 2 obtuse lobes at the 
dilated apex, generally with a tooth on each side at 
base; column elongated, but shorter than the lip, a 
little incurved, with 2 short projecting wings above 
the anther; capsule obovoid, about 3/’ long. 
In woods, Nova Scotia to Alaska and California, south 
to Vermont, along the mountains to North Carolina. 
Ascends to 4500 ft. in North Carolina. June—Aug. 
AIS 
2. Listera cordata (L.) R. Br. Heart- 
leaved Twayblade. (Fig. 1129.) 
Ophrys cordata Y,. Sp. Pl. 946. 1753. 
Listera cordata R. Br. in Ait. Hort. Kew. Ed. 2, 5: 201. 
1813. 
Stem very slender, glabrous or nearly so, 3/—10’ 
high. Leaves sessile, cordate, ovate, mucronate, 
14/-1/ long; racemes rather loose, 14/—2’ long, 4-20- 
flowered; flowers purplish, minute; pedicels bracted, 
about 1/f long; sepals and petals oblong-linear, 
scarcely 1/ long; lip narrow, often with a subulate 
tooth on each side at the base, twice as long as the 
petals, 2-cleft, the segments setaceous and ciliolate; 
column very small, the clinandrium just appearing 
above the anther; capsule ovoid, 2’’ long. 
In moist woods, Nova Scotia to Alaska, New Jersey 
and Oregon. Also in Europe and Asia. June—Aug. 
3. Listera australis Lindl. Southern 
Twayblade. (Fig. 1130.) 
Listera australis Lindl. Gen. & Sp. Orch. 456. 1840. 
Stem slender, 4-10’ high, more or less pubes- 
cent above. Leaves ovate, acutish, mucronate, 
glabrous, shining, 8’/-10’” long, 3~-7-nerved; ra- 
ceme 2/—3/ long, loosely $-15-flowered; flowers 
yellowish green with purplish stripes; sepals and 
petals minute; lip 1¢’-%4’ long, 2-parted, split 
nearly to the base, 4-8 times as long as the petals, 
its segments linear-setaceous; column very small; 
capsule ovoid. 
In bogs, New York and New Jersey to Florida 
and Alabama and Louisiana. A third leaf is rarely 
borne below the flowers. 
