162 WiEGAND : A Revisiox of the Genus Listera 



V 



The following IS a brief synopsis of the species followed by a 

 detailed description of each. Thanks are due Dr. Robinson, of 

 the Gray Herbarium, and Dr. Small, of Columbia University Her- 

 barium, through whose kindness in loaning specimens this work 

 was made possible. Professor Piper and Mr. Fernald have also 

 very kindly loaned a large quantity of material. 



SytiopsiH of tlie Species. 



Column very short (.5 mm. or less); flowers mostly small; lip not dilated above; 



leaves, except in one species, deltoid-ovate or reniform. 

 T.ip not 2-cleft, auriculate, acute or acuminate. 



Lip weakly bidentate at the base, scarcely longer than the sepals ; leaves 



basal, India. 



I. Z. niicraiitha. 



Lip not bidentate at the base, much longer than the sepals and very narrow ; 

 leaves near the middle of the stem. Japan. 2. L, Japonica. 



Lip 2-cleft or lobed. 



Lateral teeth strongly developed, between them a transverse fold ; lip no 

 auriculatej lobes linear; raceme glabrous. Europe, Asia, Xorth America. 



3' ^' cordata. 



Lateral teeth none ; raceme more or less glandular ; pedicels glandular ; 



ovaries glabrous. 

 Leaves ovate ; plant small (l2-22cm.); sepals minute ; petals recoiled ; 

 lip nuriculate, lobes almost setaceous, near the base a short transverse 

 and longitudinal fold. Eastern United States. 4. L. australis. 



J 



Leaves oval ; plant large (30-55 cm.); sepals ^ length of lip, latter not 

 auriculate, lobes oblong, a longitudinal fold on the midrib. Europe. 



5- ^' ovata. 

 Column of medium length or long (2-3 mm.); flowers larger. 



Lip auriculate, oblong, more or less ciliate, a fold between the lateial nerves 



near the base, no lateral teeth, ovary and pedicels glabrous. 



Auricles very small, clasping ; leaves large (35-50 mm. ), broadly ovate or 



oval, often acutish ; plant of medium size. N. New England and Quebec. 



6. L,. am imlafn. 

 Auricles large (1.5 mm.), divergent; leaves small (12-25 i^^ii-)' "''iii'^^vly 



ovate, obtuse; plant small (7-15 cm.). Rocky j\L)unlains. 



7. Z. borealis. 

 Lip not auriculate, dilated above. 



Leaves oval, mostly obtuse ; pedicels glandular. 



Lip sessile, bidentate at the base, small (5 mm.), a papilla at the base of 

 each tooth, abruptly dilated above and retuse, not ciliate ; ovary 

 glabrous. Oregon to Dritisli Columbia. 8. L. caur'uia. 



Lip unguiculate, lateral teeth almost obsolete, larger (9 mm.), papillae 

 none, evenly cuneate, shallowly lobed, ciliate ; ovary glandular. North 

 America, trans, cont. 9. L. convallarioides. 



Leaves ovate -reniform, often acute; pedicels glabrous except in No. ii ; 



ovaries glabrous or nearly so ; lip not ciliate, nnd without folds. 

 Lip bidentate near the base, sessile, large (9 mm.), very much dilated 

 and deeply lobed. Alleghany ^lountains and Japan. 



10. Z. Smallii. 



