ORCHIDACEJ]:. (orchis FATillLT.) 109 



* Antlier one {but distinctly 2-cdled.) 



Anther adnate to the face of the stigma Habenaria. 1 



Anther aJnate to the back of the stigma. 



Lip free from the cohimn Epipactis. 2 



Lip adherent to the base of the column Spiranthes. 3 



Anther like a lid over the stigma. 



Lip with a spur adliercnt to the ovary Corallorhiza. 4 



* * Antlitrs two, one on each side of the column. 

 Lip a conspicuous inflated sac Cypripedium. 5 



1. HABENARIA, Willd., R. Br. Rein Orchis. 

 Flowers ringent; the sepals and petals similar; lip spur-like; ovary twisted. Swamps. 

 L H. elegans, Lindl. The white flowers in a dense spike; spur filiform. 

 2. H. dilatata, Gr. Stems 1 to 3 ft. high; spikes 4 to 18 inches long; flowers small, 

 greenish, the spur about equaling the entire lip, 3 or 4 lines long. 



2. EPIPACTIS, Hall. 



Petals and sepals similar, spreading, nearly equal. Lip oblong, the upper portion con- 

 cave and fleshy, the lower i^etaloid, undivided. Stigma square, j^rojecting downward. 



\. E. Americana, Lindl. Leaves plicate; flowers brownish or purplish, pediceled 

 in a spicate raceme, pubescent. Borders of streams. 



3. SPIRANTHES, Richard. Ladies' Tresses. 



Flower oblique on the ovaiy, the 3 upper segments erect, and more or less cohering, 

 the bases of the lip covered by the remaining two segments, and bearing a pair of callosi- 

 ties. Flowers in a twisted spike, small, green or greenish-white. 



\. S. gracilis, Bigelow. Leaves all radical or nearly so, soon withering; flowers on 

 a slender smooth scape; bracts small; lip green, with a thin white margin. Hillsides. 



2. S. decipiens, Hook. Redwoods. (Bolander's Catalogue. ) 



4. CORALLORHIZA, Haller. Coral-Root. 



Perianth-segments nearly equal, the lower one (lip) bearing at the base a pair of pro- 

 jecting ridges. Brownish or yellowish, leafless herbs with sheathing bracts; flowers in 

 spiked racemes. 



1. C. striata, Lindl. Plant purplish, simple stems 12 to 18 inches high, bearing 20 

 or 30 flowers in a crowded spike, on very short i:)edicels; perianth-segments 4 to G lines 

 long, marked with 3 dark stripes; capsules reflexed. 



5. CYPRIPEDIUM, L. Lady's Slipper. 

 Sepals spreading, distinct, or two lower united. Petals resembling the sepals. Lip a 

 large inflated sac. Style bearing on each side a short stamen, the stigma covered by a 

 triangular petal-like sterile stamen, which bends down over it, 



