GENUS 14. 



ORCHID FAMILY. 



561 



Lip crested along a narrow line down the face ; peduncle as long as the capsule or longer. 



i. /. verticillata. 

 Lip crested over the whole face and lobes ; peduncle shorter than the capsule. 2. I. affinis. 



i. Isotria verticillata 



Whorled Pogonia. 



(Willd.) Raf. 

 Fig. 1383. 



Arethusa verticillata Willd. Sp. PI. 4: 81. 1805. 

 Pogonia verticillata Nutt. Gen. 2: 192. 1818. 

 /. verticillata Raf. Med. Rep. II. 5: 357. 1808. 



Stem io'-i2' high, from long fleshy roots, bear- 

 ing a whorl of 5 leaves at the summit. Leaves 

 obovate, abruptly pointed at the apex, sessile, i'-3' 

 long; flower solitary, erect or declined; peduncle 

 6"-8" long, in fruit usually equalling or exceed- 

 ing the capsule; sepals linear, \\'-2 r long, about 

 i" wide, spreading, dark purple ; petals linear, 

 erect, obtuse, greenish yellow, about 10" long; lip 

 3-lobed, crested along a narrow band, the upper 

 part expanded, undulate; capsule erect, i' or 

 more long. 



In moist woods, Ontario to Massachusetts, Indiana, 

 Michigan and Florida. Ascends to 4500 ft. in Vir- 

 ginia. Whorled snake-mouth. May-June. 



2. Isotria affinis (Austin) Rydb. Smaller 

 Whorled Pogonia. Fig. 1384. 



Pogonia affinis Austin ; A. Gray, Man. Ed. 5, 507. 

 1867. 



7. affinis Rydb. in Britton, Man. 297. 1901. 



Smaller than the preceding species, stem 8'-io' 

 high. Leaves in a whorl of 5 at the summit, 

 i '-2' long; flowers 2 or solitary, greenish yellow; 

 peduncle 2"-^" long, much shorter than the ovary 

 and capsule; sepals equalling the petals, or but 

 little longer, somewhat narrowed at the base ; lip 

 crested over nearly the whole face and lobes; 

 capsule erect, i' long or less. 



In moist woods, Vermont and Massachusetts to 

 southern New York and Pennsylvania. Rare and 

 local. Our figure is taken from Mr. Austin's original 

 sketches. June. 



15. TRIPHORA Nutt. Gen. 2: 192. 1818. 



Low herbs, with fleshy tubers and few axillary flowers. Sepals and petals separate, 

 nearly equal. Lip erect, slightly clawed, somewhat 3-lobed, crestless and spurless. Column 

 club-shaped above. Anther terminal, stalked, attached to the back of the column, its sacs 

 parallel; pollinia i in each anther-sac, powdery-granular, without caudicles. Stigma a 

 flattened disk below the anther. Capsule oval, drooping. [Greek, bearing 3 flowers.] 



About 10 species, natives of America, only the following, the generic type, found in the United 

 States. 



