614 Rydberg : The American Species of 



Plant S-8 dm. high; spur 10-14 mm. long ; lip 7-9 mm. 



Dilated portion '• f the lip oval ; spur almost % longer than the 



lip. 15. L. Thurberi. 



Dilated portion of the lip decidedly rhombic ; spur scarcely y, 

 longer than the lip. 16. L. leucostachys. 



Spur clavate at the apex. 



Leaves lanceolate or oblanceolate ; stem tall and stout; lip decid- 

 edly rhombic at the base. 16. L. leucostachys robmta. 

 Leaves narrowly linear ; stem slender ; lip not rhombic at the base. 



17. L. ^rominifolia. 

 Lip linear, /. e., not at all dilated at the base. 

 Spur usually shorter than the lip. 



Flowers purplish or greenish ; spur very short and decidedly saccate. 



I. Z. strict a. 

 Flowers white ; spur almost equalling the lip. (Convallariaefoliae. ) 

 Spur clavate. 18. L. gracilis. 



Spur filiform. 19. L. convallaria;folia. 



Spur much exceeding the lip ; flowers greenish or purplish. 



Connective narrow; spur almost twice as long as the lip. (Arizon- 



ICAE. ) 20. L. Arizonica. 



Connective broad. 



Leaves elongated, lanceolate or linear; spur 8-IO mm. long. 

 (Sparsiflorae. ) 

 Spike comparatively dense. 21. L. ensifolia. 



Spike very lax. 



Lip about 6 mm. long; spur about 8 mm., somewhat 



clavate. 22. L. laxijiora. 



Lip about 8 mm. long; spur over 10 mm., filiform. 



23. L. sparsiflora. 

 Leaves very short, ovate ; spur almost 1.5 cm. long. (Brevi- 

 FOLIAE. ) 24. L. brevifolia. 



§HvPERBOREAE : Ustially small or middle sized species, spike 

 usually dense, except in the first species ; flowers small, greenish 

 or tinged with purple, especially the petals ; spur less than twice 

 as long as the lip ; lip except in L. stricta lanceolate, /. c, some- 

 what dilated at the base but not at all rhombic ; connective nar- 

 row and anther-sacs close together. 



I. LiMNORCHis STRICTA (Lindl.) Rydb. Mem. N. Y. Bot. 



Garden i : 105. 1900 

 Platantliera stricta Lindl. Gen. & Sp. Orchid. PI. 288. 1835-9 ; 

 Habenaria gracilis Wats. Proc. Am. Acad. 11 : 277. 1876 ; Habc- 

 naria hyperborca Rothrock, Wheeler's Rep. 4 : 265. 1878 ; Habe- 

 naria saccata Greene, Erythea, 3 : 49. 1 895 ; Habenaria stricta 

 Ryd. Bull. Torr. Club, 24: 189. 1897; PlatantJicra gracilis 

 Kraenzlin, Orch. Gen. et Spec, i : 639. 1899. Not Lindl. 



