OBCHIDACEME. 107 



Order 7. OROHIDALES. 

 Family 1. ORCHIDAOEAE Lindl. Orchid Family. 



Anthers 2; lip a large inflated sac. 1. Cyprvpeilium. 



Anther solitary. _ •<.'■<.. 



Pollinia with a caudiele, which is attached at the base to a viscid disk 

 or gland. 

 Glands enclosed in a pouch. 2. Galeofchis. 



Glands not enclosed in a pouch. 



Lip not fringed nor cut-toothed. 



Valves of the anthers dilated at the base enclosing the 



glands below. 3. Perutaria. 



Valves not dilated at the base. 4. Gymnandeniop&is. 



. Lip fringed or parted and out-toothed. 5. Blephwiglottis. 

 Pollinia not produced into » caudiele (except apparently in No. 16). 

 Pollinia granulose and powdery. 



Flowers comparatively large, solitary or few; anthers incum- 

 bent on a long column. * 

 Leaves not grassdike; lip free. : 

 Flowers terminal; .lip crested.. 



, Leaves alternate. 6. Pogonia. 



Stem-leaves whdrled. V. Isotria. 



Flowers axillary ; lip not crested. . ,8. Triphora. 

 Leaves grass-like. 



Flowers solitary, terminal; lip adherent to the base 



of the column. 9. Arethusa. 



Flowers racemose; lip free. 10. Lvniodorum. 



Flowers small, numerous, in spikes' or racemes ; anthers erect, 

 jointed to a short column. 

 Leaves green, borne on the stem. 



Leaves alternate ; spike mostly twisted. 



\r, ..:,: . . : 11. Gh/rostaehys. 



Leaves 2, opposite; spike not twisted. 



12. Listera. 

 Leaves white-reticulated, basal. 13. Peramium. 



Pollinia smooth and waxy. ' 



Plants with ' coring or solid, bulbs, rarely with cpralloid roots; 

 leaves basal or cauline. 

 Leaves unfolding before or with the flowers. 



Leaf cauline ; lip ovate or auricled at the base. 



14. Achrounthes. 

 Leaf or leaves basal. 15. Leptorcliis.. 



Leaf 1, basal, unfolding after the flowering time. 

 Flowers long-spurred; lip 3-lobed. 



16. Tipularia. 

 Flowers not spurred; lip 3-ridged. 



'•■'■■ i ' '' 17. Aplectrum. 



Plants with coralloid roots, bulbless ; the leaves reduced to 

 scales. 18. Cordllorhiza. 



1. CYPRIPEDITJM L. Lady's Slipper, 



Plant 2-leaved; scape 1 -flowered. 1. C. acaule. 



Stem leafy to the top, 1-several-flowered. 



Lip 3-;5 cm. long, vertically flattened, pale yellow. 2. C. hirsutum. 



Lip 1.5-3 cm. long, laterally flattened, bright yellow. 



3. C. parviflorum. 



1. Ctpripbdium acaule Ait. Moccasin Flower. M. p. 291. Sandy or rocky 

 woods. Spring. 

 Bucks— Tullytown (Br.), Durham, Buckingham Valley (Fr.). Mont- 



