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. americana 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. fulra Michx. Slippery or Red Elm. Rich rocky woods; occasional. 



Apr. 

 U. racemosa 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. 



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

 Aug. Has hitherto been confused with U. gracilis. 



SANTALACEAE. SANDALWOOD FAMILY 



COMANDRA Nutt. Bastard Toad-flax 



C. Ricliardsiaiia 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. pnsiUnm 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. 



