ORCHIDACEAE 



Amitostigma 



Perularia 



Habenaria 



Herminium 



Goodyera 

 Spiranthes 



BB. 



D. Gland of the caudicles of the pollinia conspicuously 

 enclosed in a little sac or bursicle. 

 E. Leaf solitary; lateral lobes of lip well-developed; 



plant small, rarely up to 24 cm. tall 2. 



EE. Leaves 2 or 3; lateral lobes of the lip abbreviated, 

 at most dentiform to shortly subquadrate; plant 



larger, 23-47 cm. high 3. 



DD. Gland of the caudicles of the pollinia naked, i.e. not or 

 only partly enclosed in a sac (including Coelog- 



lossum, Gymnadenia, Platanthera) 4. 



CC. Lip without a distinct or elongate spur, although sometimes 

 concave-saccate at the base. 



F. Lateral lobes of the lip linear, much surpassing 



the minute mid-lobe 5. 



FF. Lateral lobes of the lip, if present, short and 

 broad. 

 G. Flowers in a spiral or secund raceme; lip 

 simple when expanded. 

 H. Roots solitary at the nodes of a creeping 

 stem-like rhizome ; leaves with whitish 

 reticulations; flowers few to several, 

 relatively large (about 1cm. long).. 6. 

 HH. Roots fascicled at the base of the stem; 

 leaves wholly green; flowers numer- 

 ous, very small (about 5 mm. long) 7. 

 GG. Flowers not in a spiral or secund raceme. 

 I. Lip sharply 3-lobed. 



J. Leaves scattered along the stem 

 up to the in florescence ; flowers 

 usually yellow; lip with a 



triangular-saccate basal portion 8. Cephalanthera 

 JJ. Leaves congested on the lower 

 (rarely middle) portion of the 

 stem; flowers usually red to 

 purple; lip without a saccate 



basal portion 9. 



II. Lip simple; plants with a pair of broad 



opposite leaves near the base.... 10. 



Inflorescence lateral, racemes on leafless, sheathed scapes borne 



in the axils of leaves or sheaths or from the side of a corm. 



K. Plants forming a sympodium, i.e. with stems caes- 



pitose, manifestly terminated by apical, usually 



smaller, leaves (Sympodiales). 



L. Leaves convolute in the bud, lamina commonly 



plicate; flowers relatively small, sepals 1cm. 



long; lateral lobes of the lip linear 11. 



LL. Leaves conduplicate; flowers large, sepals 2 cm. 

 or more long; lateral lobes of the lip short, 



broad, rounded 12. 



KK. Plants forming a monopodium, i.e. with unlimited 

 growth at the apex and growing on from year 

 to year (Monopodiales) 13. 



Bletilla 

 Liparis 



Oreorch is 



Cymbidium 



Luisia 



531 



