ORCHIS FAMILY 59 



8. PIPERIA Rydb. Wood Orchid. 



Spur slightly exceeding the lip. 1. P. unalaschensis. 



Spur 2-3 times as long as the lip, flUform. 



Lip linear to lanceolate, about 6 mm. long; spike dense; spur 15-lS mm. long. 



2. P. multiflora. 



lip ovate or ovate-lanceolate; spike looser; spur 10-12 mm. long. 3. P. elegans. 



9. SERAPIAS L. Hellebobine. l. S. gigantea. 



10. EBUROPHYTON Heller. i. E. Austinae. 



11. IBIDITTM Salisb. Ladies' Tresses. 



Callosities at the base of the lip obsolete; lower sepals coherent with the petals and upper 



sepals. 1. G. strictum. 



Callosities nipple-shaped, directed downwards; lower sepals free. 2. G. porrifolium. 



12. OPHRYS (Toum.) L. Twat-blade, Twipole. 



Lip broad, slightly 2-cleft at the apex, with or without a mucro in the sinus. 

 Lip with distinct rounded auricles, slightly cleft at the apex; no mucro. 



1. O. borealis. 



Lip with no auricles, but in their place two divergent small teeth at the base; mucro 

 present. 

 Lip imguiculate; lateral teeth small, without a papilla at the base. 



2. O. convallarioides. 

 Lip not unguiculate; lateral teeth prominent, with a papilla at the base. 



3. O. caurina. 



Lip narrow, 2-cleft for about half its length into linear-lanceolate lobes, without a mucro. 

 with narrow teeth at the base. 4. O. nephrophylla. 



13. PERAMIUM Salisb. Rattlesnake Plantain. 



Lip evidently saccate, with recurved margins. 1. P. ophioides. 



Lip scarcely saccate, with incurved margins. 2. P. decipiens. 



14. MALAXIS Soland. Adder's Mouth. 



Lip ovate, acuminate. 1. M. monophylla. 



Lip broadly obcordate, with a tooth in the sinus 2. M. unifolia. 



15. LIPARIS L. C. Rich. Twayblade. l. L. LoeselU. 



16. CYTHEREA Salisb. Calypso, Venus' Slipper. 



Beard of the Up yellow. 1. C. bulbosa. 



Beard of the Up white. 2. C. occidentalis. 



17. APLECTRUM Nutt. Adam and Eve, PuTTY-ROor. l. A. spicatum. 



18. CORALLORRHIZA R. Br. Coral-root. 



Spur small, adnate to the ovary. 



Lip entire, ovate, sinuate; whole plant yeUow. 1. C. ochroleuca. 

 Lip with 2 lobes or teeth below the middle; plant brownish, rarely yeUowish. 

 Column about half as long as the petals; sepals erect. 



Lip unspotted; teeth or lobes smaU; spur very smaU. 2. C. Corallorrhiza. 



Lip spotted; lobes prominent; spur manifest. 3. C. multiflora. 



Column almost ecLualling the petals; sepals reflexed. 4. C. Meriensiana. 

 Spur lacking. 



Petals and sepals 12-14 mm. long, elliptic. 5. C. striata. 



Petals and sepals 7-8 mm. long, oblong. 6. C. Vreelandii. 



