ORCHIDACEiE 



tusus; discus muriculis sparsis ornatus. Columna omnino 6 ram. 

 longa, clavata, section! propria. Anthera rigida, erecta, apiculata, 

 1.75 mm. longa. Massae polliniae ut in T. trianthophora. 



The new species of Triphora described above was collected 

 in Yucatan by G. F. Gaumer. The type preserved in the her- 

 barium of the Field Museum of Natural History is composed 

 of two plants, one in fruit, the other in flower. Originally this 

 material was identified as Pogonia mexicana Wats. var. (a spe- 

 cies now referred to Triphora), on the authority of Dr. Rudolf 

 Schlechter of Berlin. From T. mexicana (Wats.) Schltr. the 

 Yucatan species is widely separated by the oblong, denticulate 

 middle lobe of the labellum and by the complanate-muriciform 

 appendages that occur sparsely on the three middle nerves above 

 the basal keels. The type of T. mexicana has a differently formed 

 labellum, the middle lobe being cordate or subdeltoid rather 

 than oblong and the claw more cuneate, while the ecarinate part 

 of the disc-nerves lacks muriciform appendages. It is true that 

 T. mexicana closely resembles T. yucatanensis and might readily 

 be mistaken for it in the absence of flowers. (Plate 109.) 

 Yucatan, sine loco exactiore, Gaumer 1008. Floret Novembri. 



Triphora mexicana {Wats.) Schltr. in Fedde Repert. 17 

 (1921) 139. Pogonia mexicana Wats, in Proc. Am. Acad. 26 

 (1891)154. 



Pogonia mexicana Wats., now referred to Triphora by Schlech- 

 ter, was originally described from very poor material gathered 

 by Pringle in the State of San Luis Potosi, Mexico. The type 

 consists of four plants, none of which is satisfactory for critical 

 examination. Indeed, it would seem that Pringle collected his 

 specimens at a time when the flowers were passing their prime. 

 The only clue to the floral characters is contained in a carefully 



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