568 



ORCHIDACEAE. 



VOL. I. 



3. Ophrys auriculata (Wiegand) House, 

 ricled Twayblade. Fig. 1399. 



Au- 



Listera auriculata Wiegand, Bull. Torr. Club 26: 166. 1899. 

 O. auriculata House, Bull. Torr. Club 32: 379. 1905. 



Stem slender, 4'-/' high, glabrous below, glandu- 

 lar above the leaves. Leaves large, i|'-2' long, oval 

 or elliptic-ovate, borne above the middle of the stem; 

 raceme many-flowered; rachis pubescent; pedicels and 

 ovaries glabrous; sepals lance-ovate; petals oblong- 

 linear, longer than the ovary, spreading, obtuse; lip 

 slightly ciliate, oblong, broadest at the auricled base, 

 cleft i-4 its length; column rather stout, a little over 

 i" long. 



Cedar swamps and wet banks, Quebec, Maine, New Hamp- 

 shire and Vermont. July. 



4. Ophrys cordata L. Heart-leaved Tway- 

 blade. Double-leaf. Fig. 1400. 



Ophrys cordata L. Sp. PI. 946. 1/53. 



Listera cordata R. Br. in Ait. Hort. Kew. Ed. 2, 5 : 201. 

 1813. 



Stem very slender, glabrous or nearly so, 3'-io' 

 high. Leaves sessile, cordate, ovate, mucronate, i'-i' 

 long; racemes rather loose, \'-z' long, 4-2O-flo\vered ; 

 flowers purplish, minute; pedicels bracted, about i" 

 long; sepals and petals oblong-linear, scarcely i" 

 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, Labrador to Alaska, New Jersey, 

 Michigan, Colorado and Oregon. Also in Europe and 

 Asia. Twi-foil. June-Aug. 



5. Ophrys australis (Lindl.) House. South- 

 ern Twayblade. Fig. 1401. 



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

 O. australis House, Bull. Torr. Club 32 : 379. 1905. 



Stem slender, 4'-io' high, more or less pubescent 

 above. Leaves ovate, acutish, mucronate, glabrous, 

 shining, 8"-io" long, 3-7-nerved; raceme 2'-$' long, 

 loosely 8-i5-flowered ; flowers yellowish green with 

 purplish stripes ; sepals and petals minute ; lip i'-i' 

 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, Ontario, New York and New Jersey to 

 Florida, Alabama and Louisiana. A third leaf is rarely 

 borne below the flowers. 



