KEY TO 



THE NORTH AMERICAN SPECIES OF 



HABENARIAi 



I. Plants essentially northern in their distribution. Stigviatic 

 processes wanting or much reduced and inconspicuous (cf. H. 

 clavellata, H. Integra^ H. nivea). Petals simple, not bipartite. 

 Labellum never divided into three filamentous or linear divisions. 

 In this section belong Gymnadenia, Perularia, Piperia, Lim- 

 norchis and Coeloglossum, often recognized as distinct genera. 



* Labellum not fi'inged, if crenate not tripartite (cf. H. peramcena) 

 f Stem usually leafy. Leaves not basal, or if basal linear (cf. H. nivea) 

 Lip 2-3-toothed or lobed at the apex, not 

 hastate, flowers greenish 

 Spur shorter than the lip 1. H. viridis 



var. bracteata 

 Spur longer than the lip 2. H. clavellata 



Lip 3-lobed or trifid, flowers white 3. H. albida 



Lip hastate with a tubercle at base, flowers 



green 4. H.fava 



Lip crenate on the margin, flowers yellow 5. H. Integra 

 Lip narrowly oblong, flowers white 6. H. nivea 



Lip rhombic-lanceolate, dilated at base, acu- 

 minate, flowers white or yellowish green 

 Spur about equalling the lip 7. H. dilatata 



var. media 

 Spur longer than the lip var. leucostachys 



Lip lanceolate, not conspicuously dilated at 

 base, flowers greenish,^ spur not con- 



1 In strict accordance with priority Satyrium would become the valid name for this genus. 

 I have not adopted it, as to do so would be an indirect violation of the spirit of the Vienna 

 Rules. Harms's List retains Platanthera, which is clearly referable to Satyrium. 

 ^H. hyperhorea passes by insensible gradations into the section characterized by a Unear 

 labellum. The key is based on normal conditions of the flower. In H. hyperhorea the flow- 

 ers are usually in a dense cylindrical spicate raceme. In H. saccata and H. sparsiflora the 

 flowers are in an elongated, slender raceme. 



[15] 



