OttCH 1 DACE.E. 349 



ones toothed ; lip oblong, pinnately ciliate ; spur shorter than the ovary. 

 Habenaria cristata Drown. Orchis cristata Mick. 



Swamps. Penn. to Car. June, July. ^. Stem 1 2 feet high. Flowers 

 vellow, in a somewhat crowded terminal spike. Distinguished from the former 

 by its smaller flowers and more dense spike. Cristate Platanthera. 



IV. ARETHUSEJE. Pollen powdery, granular or seclile. Anther 

 terminal, opercular. 



10. POGONIA. Brown. Pogonia. 

 (From the Greek wwywi', a beard ; in allusion to the bearded lip of the flower.) 



Perianth with the segments distinct and nearly equal. Lip 

 sessile or unguiculate, cucullate, mostly with a beard-like crest 

 on the inner or upper side. Column wingless. Pollen powdery. 



1. P. ophioglossoides Drown. : scape mostly 1-flowered, with an oval-lan- 

 ceolate leaf near the middle and a foliaceous bract near the flower ; lip 

 spatulate-oblong, crested and fimbriate. Arethusa optiioglossoides Linn. 



Sphagnous swamps. Can. to Car. and Ala. June, July. Root fasciculate. 

 Scape 9 12 inches high. Flower mos.tly solitary, large, pale-purple, somewhat 

 nodding. Single-leaved Pogonia. 



2. P. xeriicillaia Nutt. : scape with a whorl of 5 elliptic-obovate leaves 

 at the summit, 1 2-flowered ; segments of the perianth unequal, the 3 

 outer ones very long and nearly linear ; the 2 inner small, lanceolate, ob- 

 tuse ; lip 3-lobed, the middle lobe dilated and undulate. Arethusa verticil- 

 lata Willd. 



Swamps. N. Y. to Geor. June, July. 1\.. Root fasciculate. Scape about 

 a foot high. Leaves 5 in a whorl at the top of the stem. Flower mostly solitary ; 

 outer segments brown, 2 inches long ; inner ones short, paler and obtuse. 



Whorled Pogonia. 



11. TRIPHORA. AfaW. Triphora. 



(Abbreviated from the Greek rpia, avQos, and 0cpw, literally, bearing three 

 flowers.) 



Perianth with the segments distinct equal and connivent. 

 Lip unguiculate, not crested. Column spatulate, flat, without 

 wings. Pollen powdery. 



T. pendula Nutt. Arethusa pendula Willd. Pogonia pendula L/ind. 



Fertile woods, about roots of trees. N. Y. to Flor. and Ala. Sept. ^. 

 Root bearing tubers. Stems 6 3 inches high, angular, often in clusters, mostly 

 purplish. Leaves 3 7, remote, very short, ovate and rather acute. Flowers 

 1 4, pale- purple, on axillary pedicels, pendulous. Lip about as long as the 

 segments of the perianth, a little rough but not crested. 



Pendulous Triphora 



12. ARETHUSA. Linn. Arethusa. 

 (From Arethusa, a nymph of Diana.) 



Perianth somewhat ringent ; the segments cohering at base, 

 connivent and cucullate above. Lip united at the base with 



