ORCHIDACE^. 349 



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

 Habenaria cristata B?-020?i. Orchis cristata Mich. 



Swamps. Penn. to Car. June, July. %.. — Stem 1 — 2 feet liigh. Flowers 

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

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



IV. Arethuse-e. Pollen powdery, granular or seciile. Anther 

 terminal, opercular. 



10. POGONIA. Broion.—'PogomsL. 



(From the Greek Trwywi/, a leard ; in allusion to the bearded Up 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 Brown. : scape mostly 1-flowered, with an oval-lan- 

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

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



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

 Scape 9 — 12 inches high. Flovjer mostly solitary, large, pale-purple, somevyhat 

 nodding. • Single-leaved Pogonia. 



2. P.verticillaia Nutl. : 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- 

 lota Willd. 



Swamps. N. Y. to Geor. June, July. %. — Root fasciculate. Scape about 

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

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



Whorled Pogonia. 



11. TRIPHORA. iVti^^.— Triphora. 



(Abbreviated from the Greek rpia, avdui, and (bepo), literally, bearing three 

 flowers,) 



Perianth with the segments distinct equal and connivent. 

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

 wings. Pollen powdery. 



7\ pendula Nutt. Arethusa pendula Willd. Pogonia pendula hind. 



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

 Root bearing tubers. Stems 6 — 8 inches high, angular, often in clusters, mostly 

 purplish. Leaver 3 — 7, remote, very short, ovate and rather acute. Flotoera 

 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 



