ORCHID FAMILY. 



i. Listera convallarioides (S\v.) Torr. 



(Fig. 1128.) 



vpipaclis convallarioides Sw. Kongl. Vet Acad. Handl 



(II.) 21 : 232. 1800. 

 '.istera convallarioides Torr. Comp. 320. 1826. 



Stem 4 / -io / high, glandular-pubescent above the 

 leaves. Leaves smooth, round-oval or ovate, obtuse 

 cuspidate at the apex, sometimes slightly cordate 

 reniform at the base, 3-o.-nerved. Raceme i %'-$' 

 jng, loosely 3-i2-flowered; flowers greenish yellnw. 

 licels filiform, bracted, $"-4" long; petals and 

 als 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. 





Broad-lipped TwaybUde. 



2. Listera cordata ( L. R Br Heart* 

 leaved Twayblade. (Fig. 1129.) 



Ophrys cordata L. Sp. PI. 



i 



Listera cordata R. Br. in Ait Hurt. Kcw Kd i 5 



1813. 



Stem VITV slender, glabrous or nearly so, j'-K/ 

 high. Leaves sessile, cordate, orate, uimmnaH, 

 %'-\' long; racemes rather loose, tf'-a' loaf. 4 

 flowered; flowers purplish, minute; pedicels bractad. 

 about i" long; sepals and petals oblong-linear. 

 scarcely i" long; lip narrow, often with a snbolat* 

 tooth on each side at the base, twice as loaf m the 

 petals, 2-cleft, the segments setaceous and rilioiaU; 

 column vi-ry sm.ill, tin- clinandriun just apprahnf 

 above the anther; capsule ovoid, t" loaf. 



In moist woods. Nova Scotia to AUka. N> ] 

 and Oregon. Also in Europe and Aa. Jane \u 



3. Listera australis Lindl. Southern 



Twayblade. (Fig. 1130.) 



r 



Listera australis Lindl. Gen. & Sp. Orch. 456. 1840. 



Stem slender, 4 / -io / high, more or less pubes- 

 cent above. Leaves ovate, acutish, mucronate, 

 glabrous, shining, 8"-io" long, 3-7-nerved; ra- 

 ceme 2 / -3 / long, loosely 8-i5-flowered; flowers 

 yellowish green with purplish stripes; sepals and 

 petals minute; lip %'-& 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 n 

 borne below the flowers. 



