FLORA OF BURLINGTON AND VICINITY 27 



IRIDACEAE. IRIS FAMILY 



IRIS (Tourn.) L. Flelr-de-lis 



I. PSEUDACORus L. Yellow Iris. A garden escape, bank of WinooskI 

 River, Essex, (Ross). June. 



I. Ycrsicolor L. Wild Iris. Blue Flag. Wet meadows; common. June, 

 July. 



SISYRINCHIUM L. Blie-eve» Gk.vss 



S. aiigustifoliuiii Mill. Meadows, fields and damp sandy soil; common. 

 May, June. 



ORCHIDACEAE. ORCHIS FAMILY 



ARETHUSA (Gronov.) L. 



A. Imlbosa L. Sphagnum bogs; occasional. June. A white-flowered 

 form occurs, South Burlington, (Howe). 



CALOPOGON R. Br. 



C. pulchellus (Sw.) R. Br. Grass Pink. Bogs; occasional. June, 

 July. 



CORALLORRHIZA (Haller) Chat. Cor.\i, Root 



C. niaculata Raf. Large Coral Root. Woods; occasional. July, Aug. 

 C. trifida Chat. Early Coral Root. Swamps and damp woods; occa- 

 sional. May, June. 



CYPRIPEDIUM L. L.vdy's Slipper. Mocc.vsin Flower 



C. acaule Ait. Stemless or Pink Lady's Slipper. Dry woods; frequent. 



May, June. 

 C. arietmuni R. Br. Ram's Head Lady's Slipper. Occasional In rocky 



woods where it reaches great perfection, colonies of thirty-nine to 



fifty blossoms having been seen. May, June. 

 C. liirsntum Mill. Showy Lady's Slipper. Cold swamps; occasional. 



June, July. 

 C. parTiflonim Salisb. Smaller Yellow Lady's Slipper. Bogs and low 



woods; rare. May, June. South Burlington, (Torrey) ; Colchea- 



ter, (Griffin). 

 C. paryiflorum Salisb., var. pubesceiis (Willd.) Knight. Large Yellow 



Lady's Slipper. Rich moist woods; frequent. May, June. 



