ORCHID ACE^E. (ORCHIS FAMILY.) 343 



- - Scape or stem naked above, one-leaved at the base. 



4. H. Obtusata, Richardson. Leaf obovate or spatulate-oblong : upper 

 sepal very broad and rounded : lip deflexed, about the length of the tapering 

 and curving spur : anther-cells arcuate and widely separated. Colorado and 

 northward, thence eastward across the continent. 



5. SPIRANTHES, Richard. LADIES' TRESSES 



Dilated summit of the lip spreading and undulate. Column very short, 

 oblique, terminating in a stout terete stipe. Flowers small, white. 



1. S. Romanzoffiana, Cham. Glabrous, rather stout, 4 to 18 inches 

 high : leaves oblong-lanceolate to linear : spike dense, 3-ranked, conspicuously 

 bracteate, 1 to 4 inches long : perianth curved ; lip recurved, contracted below 

 the rounded wavy-crenulate summit ; callosities smooth, often obscure. 

 From Colorado northward and ranging across the continent. 



6. GOO DYER A, R. Br. RATTLESNAKE PLANTAIN. 



Scapes few-bracteate : leaves thickish, rosulate at the base, petioled : root 

 stock creeping, with fibrous fleshy rootlets. 



1. G. Menziesii, Lindl. Scape and inflorescence pubescent: leaves 

 smooth, ovate-oblong to oblong-lanceolate, reticulated with light greenish 

 markings : spike many-flowered, rather dense, secund : perianth white, puberu- 

 lent : column short and straight : gland and bifid beak very narrow and elon- 

 gated. From Colorado northward, thence eastward along the northern 

 border to W. New York ; also in the Pacific States. 



7. LISTER A, R. Br. TWAYBLADE. 



Sepals and petals similar : lip free, longer than the sepals. Column free 

 and naked. Stems from fibrous and creeping roots : flowers small, in a loose 

 raceme. 



1. L. COnvallarioides, Nutt. Stem slender, 3 inches to a foot high, 

 naked excepting one or two sheaths at base and the pair of orbicular or ovate 

 leaves just below the raceme : inflorescence pubescent : sepals and petals linear; 

 lip oblontj-ovate and cuneate, with a small tooth on each side near the base. 

 From the Sierra Nevada eastward across the continent. 



2. Ii. cordata, R. Br. Leaves smaller, triangular-ovate and somewhat cor- 

 date : flowers minute, on short pedicels in a smooth raceme : sepals ovate ; Up 

 linear. Same range as last. 



8. EPIPACTIS, Haller. 



Sepals and petals nearly equal: lip narrowly constricted in the middle. 

 Column short, erect. Stem from creeping rootstocks : flowers few and pedi- 

 celled, with conspicuous bracts divergent, and the ovaries at right angles to 

 the stem. 



1. E. gigantea, Dougl. One to four feet high, nearly smooth : leaves 

 from ovate below to narrowly lanceolate above, somewhat scabrous on the 



