460 ORCHIDACEAE. 



2. Orchis rotundifolia Pursh. Small Round-leaved Orchis. (Fig. 1095.) 



Orchis spectabilis Pursh. Fl. Am. Sept. 588 1814. 



Platanthera rotundifolia Lindl. Gen. & Sp. Orch. 292. 

 1835- 



Stem slender, S'-io' high, i-leaved near the base. 

 Leaf varying from nearly orbicular to oval, i'_ 

 long, i '-2' wide, with I or 2 sheathing scales below it; 

 spike 2-6-flowered; flowers 6 // -8 // long, subtended by 

 small bracts; lateral sepals spreading, sometimes 

 longer than the petals; sepals and petals oval, rose- 

 color; lip white, purple spotted, longer than the 

 petals, 3-lobed, the middle lobe larger, dilated, 2-lobed 

 or notched at the apex; spur slender, shorter than the 

 lip. 



In damp woods, Greenland to the Rocky Mountains. 

 Maine, New York and Minnesota. ' June-July. 



3. HABENARIA \Villd. Sp. PL 4: 44. 1805. 



Herbs, with thick fibrous or tuberous roots, our species with leafy stems. Flowers 

 greenish, white, purple or yellow, mostly in spikes or racemes. Sepals equal or nearly so, 

 separate, or coherent at the base, the lateral ones usually spreading. Petals mostly smaller 

 than the sepals; lip spreading, or drooping, with a spur at its base, entire, or 3-5-cleft, or 

 lacerate. Column very short. Anther-sacs elevated, more or less divergent. Pollinia 

 coarsely granular; caudicles short; glands naked. [Latin; a rein or strap.] 



About 400 species, widely distributed. Besides the following, some 20 others occur in the 

 southern and western parts of North America. 



Leaves only 2, basal. 

 Scape bracted. 

 Scape naked. 

 Leaf solitary. 



Leaves several or numerous. 

 Lip not 3-parted. 

 Lip entire. 



Ovary not twisted. 



Ovary more or less twisted. 



Lip lanceolate; flowers greenish yellow. 

 Lip rhombic, dilated at the base; flowers white. 

 Lip crenulate or erose-dentate ; flowers orange-yellow. 

 Lip 2-^3-toothed. 



Lip toothed at the apex. 



Spur sac-like, shorter than the ovary. 

 Spur slender, longer than the ovary. 

 Lip with an obtuse tooth on each side at the base, and a central 



Lip pectinately fringed. 



Spur half as long as the ovary; flowers yellow. 

 Spur longer than the ovary. 

 Flowers bright yellow. 

 Flowers white. 

 Lip 3-parted. 



Segments of the lip deeply^ fringed. 



Segments narrow ; fringe of a few threads. 

 Segments broadly fan-shaped; fringe copious. 



Segments fringed to the middle; flowers white. 

 Segments fringed to about one-third or less; flowers lilac. 

 Raceme 2'-2*A' thick; lip H'-i' broad. 

 Raceme I'-i'A' thick; lip 4" -6" broad. 

 Segments of the lip cut-toothed; flowers violet-purple. 



1. H. orbicnlata. 



2. H. Hooker i ana. 



3. H. oblusala. 



4. H. nii-ea. 



5. H. hvperborea. 



6. H. dilatata. 



~. H. Integra. 



8. H. bracteata. 



9. H. clavellata. 

 tubercle. 



10. H.flara. 



1 1. H. crisiala. 



12. H. cilia ris. 



13. H. blephariglottis. 



14. H. lacera. 



15. H. leucophaea. 



16. H. grand (flora. 

 17- H- Psycodts. 



18. H. peramoena. 





