210 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



Habenaria thurberi from south of Babocomari, Cochise County 

 (Thurber 925), type of Limnorchis arizonica from the Rincon Moun- 

 tains, Pima County (Nealley 78). New Mexico and Arizona, south 

 to Oaxaca. 



3. Habenaria hyperborea (L.) R. Br. in Ait. f., Hort. Kew. ed. 2, 5: 



193. 1813. 



Orchis hyperborea L., Mant. 121. 1767. 



Lukachukai and White Mountains, Apache and Greenlee Counties, 

 7,500 to 9,500 feet, in rich moist woods, July to August. Newfound- 

 land to Alaska, south to New Jersey, Arizona, and Oregon. 



4. Habenaria sparsiflora S. Wats., Amer. Acad. Arts and Sci. Proc. 12: 



276. 1877. 



Limnorchis sparsiflora Rydb., Torrey Bot. Club Bui. 28: 631. 



1901. 



Apache, Navajo, and Coconino Counties, 7,000 feet and doubtless 

 higher, June to October. Colorado and New Mexico to Washington, 

 northern Arizona, and southern California. 



3. EPIPACTIS. Helleborine 



Flowering stem tall, leafy, from a creeping rootstock; inflorescence 

 a few-flowered bracted raceme; flowers greenish or purplish, the lip 

 saccate only near the base, the larger terminal portion deltoid-ovate, 

 inconspicuously crested. 



1. Epipactis gigantea Dougl. ex Hook., Fl. Bor. Amer. 2: 202. 1839. 



Serapias gigantea A. A. Eaton, Biol. Soc. Wash. Proc. 21: 67. 



1908. 

 Amesia gigantea Nels. and Macbr., Bot. Gaz. 56: 472. 1913. 



Navajo and Coconino Counties to Cochise and Pima Counties, 

 5,000 to 7,500 feet, rich woods, June to July. Montana to British 

 Columbia, south to western Tex"as, Arizona, and California. 



4. SPIRANTHES. Ladies-tresses 



Plants leafy -stemmed from a cluster of tuberous-thickened roots; 

 leaves with well-developed blades or reduced to sheathing scales; in- 

 florescence a twisted spike with yellowish white flowers in 1 to 3 ranks; 

 lip concave toward the base, the distal portion expanded, erose. 



Key to the species 



1. Leaves reduced to thin sheathing scales; scapes slender, glandular-pubescent 

 above; spike slender, few-flowered, the flowers in 1 rank; lip dentate. 



1. S. PARASITICA. 



1. Leaves with well-developed, lanceolate or oblanceolate, green blades; scapes 

 stout (2). 

 2. Inflorescence glabrous or nearly so; flowers crowded, commonly in 3 ranks, 

 less than 1 cm. long; leaf blades seldom more than 1 cm. wide. 



2. S. ROMANZOFFIANA. 



2. Inflorescence villous; flowers not crowded, commonly in 1 rank, 1 cm. long 

 or longer; leaf blades 2 to 3 cm. wide 3. S. michuacana. 



