LlMXORCHIS AND PlPERIA NORTH OF MEXICO 613 



Synopsis of Species 



Lip more or less lanceolate, i. e., somewhat dilated near the base. 

 Flowers greenish or purplish. 



Spur not twice as long as the lip. (Hvperhorkak. ) 



Spur decidedly clavate, thickened and obtuse at the apex, shorter than 



the lip. 



Petals purplish ; spur only one half to two thirds the length of the 



lip, very saccate. 

 Lip linear or nearly so^ 5-7 mm. long ; ovary slightly curved ; 



spike usually elongated. I . Z. stricta. 



Lip lanceolate, fleshy, 4-5 mm. long ; ovary strongly curved ; 

 spike usually short. 2. Z. pitrpttrascens. 



Petals greenish ; spur almost equalling the lip* 



Petals ovate, three fourths as long as the upper sepal ; spur very 



saccate. 3. Z. brachypetala. 



Petals lanceolate, only slightly shorter than the upper sepal ; 



spur less saccate. 

 Lips less than 5 mm. long, lanceolate. 



4. Z. liridi flora. 



Lip over 5 mm. long, ovate-lanceolate. 



5. Z. //tajor. 



Spur slender, scarcely thickened at all towards the apex, often acutish, 



equalling or slightly exceeding the lip. 

 Plant tall and stout ; flowers comparatively large ; sepals 4-6 mm. 



long. 



6. Z. media. 



Plant slender ; flowers small ; sepals 2.5-4 mm. long. 

 Flowers almost erect in a rather lax spike. 



7. Z. Huronemis. 

 Flowers lateral in a dense spike. 8. Z. kyperhorea. 



Spur about twice as long as the lip. (Behrivgianae. ) 9. Z. Behringiana. 

 Flowers white or nearly so. 



Spur about equalling or only slightly exceeding the lip. (Dilatatak. ) 

 Spur usually shorter than the lip and clavate. 10. Z. borealis. 

 Spur equalling or slightly exceeding the lip, slightly or not at all clavate. 

 Plant over 3 dm. high. 



Bracts all longer than the flowers, the lower three times as long ; 



lips about I cm. long, the dilated part oval. 



11. /.. folios a. 



^ 



Upper bracts shorter than the flowers, the lower at most twice a 



long ; lips 5-7 mm. long, decidedly rhombic at the base. 

 Petals broadly lanceolate ; flowers inodorous or nearly so. 



12. L. dilatata. 



Petals narrowly linear-lanceolate ; flower very fragrant. 



13. Z. fragrans. 



Plant less than 3 dm. high ; petals narrowly linear-lanceolate. 



14. L. leptoceratitis. 



Spur from % to % longer than the lip. ( Leucostach y ae. ) 



Spur filiform, mostly acutish. 



Plant 3 dm. or less high ; spur 7-8 mm. long ; lip 5-6 mm. 



14. L. leptoceratitis. 



