246 



ORCHIDACEAE 



Glands naked. 



Beak of the stigma with 2 or 3 



appendages. 

 Beak of the stigma without 

 appendages. 

 Stem scapiform; leaves 1-2, basal; anther 

 sacs divergent. 

 Lip fringed or parted or cut-toothed. 

 Pollinia not produced into a caudicle (except apparently in 

 No. 23). 

 Pollinia granulose or powdery. 



Flowers comparatively large, solitary or few; 

 anthers incumbent on a long column. 

 Leaves not grass-like; lip free. 



Flowers terminal, the lip crested. 

 Leaves alternate. 

 Stem leaves whorled. 

 Flowers axillary, the lip not crested. 

 Leaves grass-like. 



Flower solitary, terminal. 

 Flowers racemose, lip free. 

 Flowers small, numerous, in spikes or racemes. 

 Anther operculate; leaves broad, alternate. 

 Anther not operculate. 



Leaves green, borne on the stem. 



Leaves alternate; spike mostly 



twisted. 

 Leaves 2, opposite; spike not 

 twisted. 

 Leaves white-reticulate, basal. 

 Pollinia smooth or waxy. 



Plants with corms or bulbs; leaves basal or 

 cauline. 

 Leaves unfolding before or with the flowers. 

 Leaf cauline; lip smooth or auricled at 



base. 

 Leaf or leaves basal. 

 Leaf 1, basal, unfolding before the flowers. 

 Flowers long-spurred; lip 3-lobed. 

 Flowers not spurred; lip 3-ridged. 

 Plants with coralloid roots, bulbless, the leaves 

 reduced to scales. 



6. Gymnadeniopsis. 



7. LlMNORCHIS. 



8. Lysias. 



9. Blephariglottis. 



10. POGONIA. 



ii. isotria. 



12. Triphora. 



13. Arethusa. 



14. LlMODORUM. 



15. Serapias. 



16. Iridium. 



17. Ophrys. 



18. Peramium. 



19. Malaxis. 



20. LlPARIS. 



21. TlPULARIA. 



22. APLECTRUM. 



23. CORALLORHIZA. 



i. Fissipes Small. 

 F. acaulis (Ait.) Small {Cypripedium acaide Ait.). In sandy 

 or rocky woods: Newf. to Ont., N. Car., Tenn., Ky. and 

 Minn. 



Throughout the range, locally absent. Albino forms are not 

 infrequent. 



