34 FLORA OF BURLINGTON AND VICINITY 



PILEA Lindl. Richweed. ClEarweed 



P. pumila (L.) Gray. Cool and moist shaded places; frequent. July, 

 Aug. 



ULMUS (Tourn.) L. Elm 



U. araericaiia L. American or White Elm. Moist soil; common. Apr. 



U. CAMPESTRis L. English Elm. Commonly planted and escaped to 

 roadside, Colchester, (N. F. F.). Apr. 



U. fulva Michx. Slippery or Red Elm. Rich rocky woods; occasional. 

 Apr. 



U. raceniosa Thomas. Cork or Rock Elm. Occurs as a shade tree in 

 Burlington and search will probably reveal it on the river banks 

 or calcareous ridges in this vicinity. Apr., May. 



URTICA (Tourn.) L. Nettle 



U. gracilis Ait. Slender or Tall Wild Nettle. Fence rows and moist 

 ground; common. July, Aug. 



IT. Lyallii Wats. Alluvial thickets and waste places; frequent. July, 

 Aug. Has hitherto been confused with V. gracilis. 



SANTALACEAE. SANDALWOOD FAMILY 



COMANDRA Nutt. Bastard Toad-flax 



C. Eicliardsiaiia Fern. Dry sandy or gravelly soil : common. May, 

 June. 



C. umbellata (L.) Nutt. Dry ground; rare. May, June. Colchester, 

 (Griffin). 



LORANTHACEAE. MISTLETOE FAMILY 



ARCEUTHOBIUM Bieb. 



A. pnsllliiiii Peck. Dwarf Mistletoe. Parasitic on spruce and tama- 

 rack. May. Colchester, (Jones). 



ARISTOLOCHIACEAE. BIRTHWORT FAMILY 



ASARUM (Tourn.) L. Asarabacca. Wild Ginger 

 A. canadense L. Rich woods; common. Apr., May. 



