ORCHIDACEiE 



H.volcanica ser. 3, 3: 30 (1845). — G. prasina A. Rich., in hb. — (Cf. Pla- 

 tanthera sparsiflora Schltr., in Bull. Herb. Boiss. 7: 539.) 



*' Platanthera (§l.a.) volcanica; caule folioso, foliis ensi- 

 formibus erectis trinerviis, spica elongata cylindracea, bracteis 

 herbaceis acuminatissimis floribus longioribus, petalis ovatis 

 sepalisque obtusis, labello lanceolate obtuso medio subcalloso 

 calcare filiformi triplo breviore, anthera subhorizontali, rostello 

 piano 3-lobo. — Mexico: Real del Monte, in agro volcanico prope 

 Guajolote, Oct. H art weg. 



"The stem of this plant is from 1 to 3 feet high, or even more. 

 Its nearest affinity is with P. leucostachya. The sepals are her- 

 baceous; the petals and lip purple." Lindl. loc. cit. 



Furthur studies on more material may prove that Habenaria 

 volcanica and H. limosa are conspecific, in which case H. limosa 

 should become the name of the species. The difference in the 

 outline of the lip appears to be the only satisfactory means of 

 separating H. volcanica from H. limosa. In the former the lip is 

 lanceolate, in the latter oblong-linear. (Plate 62.) 



MEXICO, Lower California 



La Chuparosa, October 17, 1893, T. S. Brandegee (1, 3). 

 Chihuahua : In the SieiTa Madre, June 21-July 29, 1899, E. W. Nelson 

 (no. 6151) (2); August 1-20, 1899, Nelson (no. 6197) (2).— Sierra Madre, 

 near Colonia Garcia, 7500 ft., August 16, 1899, C. H. Townsend <^ C. M. 

 Barber (no. 262) (4). 



Coahuila: Carneros Pass, Picacho Mts., September 15, 1889, Priiigle (no. 

 2828) (3, 7). 



Zacatecas: In the Sierra Madre, August 18, 1897, J. N. Rose (no. 

 2386) (2). 



Federal Dist. : Serrania de Ajusco, 10,000 ft., August 18, 1896, Pringle 

 (no. 11,858) (7). 



O AX AC a; F1. vertes, aout, sur les roches trachytiques a 11,500 pd., 1840, 

 H. Galeotti (no. 5191) {91\{Gymnadenia prasina A. Rich.). — Fl. vertes, 

 Cerro San Felipe, 8000 ft., November, 1840, Galeotti (no. 5053) (21) (type 



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