BILLINGS. — PLANTS. 13 



AKACE-tf:. 



Arisocoia triphyllum, Torr May 22. 



Acorus calamus, L June 15. 



Calla palustris June 22. 



TYPHACE.E. 



Typha latifolia, L July 21. 



NAIADACE^I. 



PotamogetOD pectinatus, L July 21. 



" hybridus, Michx do 



" perfoliatus, L do 



u comprcssus, L July 31. 



ALISMACEiE. 



Sagittaria variabilis, Engelm July 14. 



Alisma plantago, L., var Americanum July 28. 



ORCIIIDACE.E. 



Orchis spectabilis, L June 5. 



Cypripedium pubescens, Willd June 15* 



Platanthera hyperborca, Lindley June 22. 



" dilatata, do do 



Cypripedium spectabile, Swartz do 



Plathanthera psycodes, Gray July 14. 



Calopogon pulcbellus, R. Br do 



IRIDACE.3E. 



Iris versicolor, L June 15. 



Sisyrinchium Bermudiana, L June 22. 



SMILACE.E. 



Trillium ercctum, L May 1 



" grandiflorum, Salisb May 1 



crytbrocarpum, Michx May 16 



Medeola Virginica, L , June 15 



Smilax herbacea, L ; June 22 



