84 Rhodora [April 



As Schlechter's treatment of the Spiranthea* necessitates changes 

 in the nomenclature of several American species that are natives of 

 the United States it may he of interest to tabulate them here. 



1. Mesadenus lucayanus (Britton) Schltr. 

 Ibidium lucayanum Britton. 

 Spiranthes lucayana Cogn. Florida. 



2. Cyclopogon cranichoides (Griescb.) Cogn. 

 Pdexia cranichoides Grieseb 

 Spiranthes Storcri Chapm. 



Beadlea Storcri Small. 



Sauroglossiun cranichoides Ames. Florida. 



3. Centrogenium setaceum (Lindl.) Schltr. 

 Collca caicarata Lindl. 



Ncottia caicarata Hook. f. 



Pel ex ia sctacea Lindl. 



(t) KHroplectris aevminata Rafmesque. Florida. 

 The genus Stenorrhynchus is retained in the original conception 

 of that genus. Representatives are found in the southern United 

 States. 



PLATE 127. 

 Spiranthes cernua L. C. Rich. 



Figs. 1 it. 2. General habit, natural size. 



Fig. 3. Lateral sepal X4. 



Fig. 4. Petal X4. 



Fig. 5. Upper sepal X4. 



Fig. 6. Labellum X3. Spread out to exhibit outline. 



Fig. 7. Column X8. The heart-shaped area represents the stigmatie sur- 

 face; the disc of the Polhnia is indicated by the shaded area above. 



Fig. 8. Pollinia X10. 



Fig. 9. Pollen tetrad highly magnified. 



Fig. 10. Seed much enlarged, showing polyembryony. 



Fig. 11. Section through perianth, column and ovary X4, to show position 

 of anther, Pollinia and honey gland. 



Spiranthes cernua var. ochroleuca Ames 



Fig. 12. General habit, leaves and roots removed, natural size. 

 Fig. 13. Labellum X3. Spread out to exhibit outline. 



PLATE 128. 

 Spiranthes cernua X gracilis. 



Fig. 1. General habit, natural size. 



Figs. 2 & 3. Flower X4. Showing wide-spreading lateral sepals. 



Fig. 4. Labellum X4. 



Fig. 5. Column X4. 



Fig. 6. Pollen tetrad highly magnified. 



Fig. 7. Lateral sepal X4. 



Fig. 8. Petal X4. 



