WiEGAXD : A Revision of the Genus Listera 167 



long-linear petals, both large, obtuse (34 length of the lip), longer 

 than the ovary, spreading : lip short (7 mm. long), broadly oblong, 

 deeply retuse at the apex, the sinus open, its tooth unusually 

 large, lobes very obtuse but scarcely dilated, base sessile, expanded 

 on each side into a large oblong divergent auricle (the latter 

 mm, long, i i^ mm. wide), a fold extending between the lateral 

 veins near the base, lip strongly ciliate and cellular-papillose 

 toward the apex : column long (3 mm.), and rather stout, arcuate. 



The long white hairs mentioned in the original description as 

 borne in the inflorescence, although abundant on the type speci- 

 men, are almost entirely wanting on the other specimens, which 

 suggests that they may be foreign bodies. 



Rocky Mountains of Colorado, and northward to the Slave 

 River British America. 



Specimens examined: Colorado, Sawatch Range ("alpine") 

 Brandegee. Rocky Mts., Drummond. Ft. Smith, Slave River, 

 N. W. Ten, Miss E. Taylor (Columbia Herb., type). Ft. Simpson, 

 Brit. Am. (Columbia Herb.). 



8. LiSTER.\ CAURiNA Piper, Erythea, 6: 33. 1898. 



Listera couvallarioidcs Hooker Fl. Bor. Am. pi. 20j. 1840. 



Stem .slender (12-30 cm. high), glabrous below, densely glan- 

 dular-pubescent above the leaves, rarely a bract below the raceme, 

 basal sheaths loose; leaves rather large (35-70 mm. long), oval to 

 elliptic-ovate, thin, slightly apiculate or often acute, borne near 

 the middle of the stem, bright green : raceme many-flowered, open: 

 rachis pubescent : bracts 2-5 mm. long, rhombic-ovate, acumi- 

 nate, often slightly glandular, the lower sometimes two-flowered 

 and bifurcate : flowers small, the long slender glandular pedicels 

 (4-6 mm. long) longer than the bracts and exceeding the ovaries; 

 the latter glabrous : sepals and petals both lanceolate or linear- 

 lanceolate, acutish, 2^ the length of the lip, slightly longer than 



the ovary, spreading : 



) 



clined, narrowly oblong, abruptly dilated and rounded above, not 

 ciliate, retuse, mucron in the sinus blunt, provided at the sessile 

 base with a very slender, almost filiform, ascending glabrous ner\'e- 

 less tooth on each side (i mm. long), a papilla at the base of each 

 tooth : column relatively short, not .stout (1.5 mm. long) . 



Damp mossy woods, Oregon and Idaho to British Columbia. 

 (Hooker). Occasionally one or two bracts are borne below the 

 raceme. 



Specimens examined : Oregon, near Mt. Hood, Howell (1875); 



