Dec, 1909.] The Orchids of Ohio. 25 



larger and of different form than the others, often spurred, and 



called the lip; fertile stamens one or two, variously united with 



the style into an unsymmetrical column; seeds numerous and 



minute. 



KEY TO THE OHIO GENERA. 



1. Anthers 2, one on each side of the style, with a trowel-shaped body 

 on the upper side ; lip a large inflated sac Cypripedium 



1 . Anthers 1 , lip not a large inflated sac 2 



2. Leaves 5, whorled, on a long stalk, flowers terminal; lip spurless; 



pollen mass powdery-granular Isotria 



2. Leaves not whorled though they may be opposite 3 



3. Leaves broad in a basal rosette white reticulated, the flowering stems 



with bracts, the flowers in bracted spikes Peramium 



3. Flowering stem with one well developed leaf (not grass-like) at about 

 the middle 4 



3. Stems with several leaves, or leafless; if with basal leaves, then not 



in a rosette 5 



4. Flowers large, 1 or 2 Pogonia 



4. Flowers small, numerous, in a terminal raceme Achroanthes 



5. Flowers single, rose-purple, the lip crested with hairs; leaves linear 



or reduced to bracts Arethusa 



5. Flowers several or numerous 6 



6. With 1 or 2 prominent basal leaves, the stem leaves reduced to 



bracts, or with all the leaves bract-like 7 



6. With normal leaves on the stem 12 



7. With 1 or 2 basal foliage leaves 8 



7. Leaves all reduced to bracts 11 



8. With 2 basal leaves 9 



8. With 1 basal leaf 10 



9. Flowers in a short loose spike with large leaf-like bracts surpassing 



them, violet-purple mixed with lighter purple and white; lip 



entire, produced below into a spur Galeorchis 



9. Flowers in a long loose spike, greenish or white, bracts large, nearly 



equalling the flower; lip linear, or nearly so, spur long and slender 



Lysias 



9. Flowers in terminal racemes, brownish-purple or yellowish-green, the 



subtending bracts minute and scale-like; lip flat, entire, not spurred. 



Leptorchis 



10. Flowers in a terminal raceme, the pedicels subtended by small bracts; 



flowers not spurred Aplectrum 



10. Flowers in a long loose raceme, nodding, bractless; flowers long- 



spurred Tipularia 



11. Flowers in a spike, without spurs, white, greenish, or yellowish. 



Gyrostachys 



1 1 . Flowers in a raceme, with short spurs, dull ptirplish, or whitish mottled 



with crimson Corallorhiza 



12. Flowering stem with a single large grass-like leaf; flowers large, 4-10. 



Limodorum 



12. Flowering stem with several prominent leaves 13 



13. Leaves not much longer than broad; flowers few, axillary, pale purple, 



the lip spurless Triphora 



13. Leaves all much longer than broad 14 



14. Flowers spiked, small, greenish, without a spur, leaves mostly narrow 



or bract-like Gyrostachys 



1 4. Flowers with a spur 1 o 



15. Lip of the corolla fringed or parted and cut-toothed; spike with 



foliaceous bracts , Blephariglottis 



