22 NATURAL HISTORY AND TOPOGRAPHY OF GROTON, MASS. 



Ailanthus. Tree of Heaven. Ailanthus glandulosa. Cultivated. 

 Mr. G. Shattuck's. June i. 



Holly. Ilex opaca. Cultivated. Mr. Huebner's. June i. 



Horse Chestnut. Aesculus Hippocastanum. Has become native. 

 Roadsides. Main Street. May 20. 



Striped Maple. Moosewood. Acer Pennsylvanicum. Roadsides. 

 Native. June. 



Sugar Maple. Rock Maple. Acer saccharum. Long Hill. 

 Main Street. Native. April 2. 



Silver Maple. Soft Maple. White Maple. Acer saccharinum. 

 River bank. Red Bridge. Native. April 1 . 



Red Maple. Swamp Maple. Soft Maple. Acer rubrum. Main 

 Street. Native. April. 



Norway Maple. Acer platanoides. Long Hill. Cultivated. 

 April. 



Sycamore Maple. Acer pseudoplatanus. Cultivated. May. 



Box Elder. Ash-Leaved Maple. Acer negundo. Cultivated. 

 Groton School. April. 



Staghorn Sumach. Rhus typhina. Rocky hills. Native. June 10. 



Smooth Sumach. Rhus glabra. Roadsides. June 20. 



Dwarf Sumach. Rhus capallina. Roadsides. July 10. 



Poison Sumach. Poison Dogwood. Rhus venenata. Our woods. 

 June 1. 



Poison Ivy. Poison Oak. Rhus toxicodendron. Main Street. 

 River banks. Roadsides. The leaves of this plant closely resemble 

 the Woodbine. There need be no confusion if the following rhyme 

 is remembered. " Leaves three quickly flee. Berries red, have no 

 dread. Berries white, poisonous sight." W. H. Gibson. June. 



Round-Leaved Cornel or Dogwood. Comus circinata. Elm 

 Avenue. June 2. 



Silky Cornel. Kinnikinnik. Comus sericea. Frog Pond. June 5. 



Red-osier. Dogwood. Comus stolonifera. Elm Avenue. 

 May 30. 



Panicled Cornel. Cornus paniculata. Long Hill. June 1. 



Alternate-Leaved Dogwood. Cornus alternifolia. Elm Avenue. 

 May 30. 



Flowering Dogwood. Cornus florida. Lower Ayer road. May. 



Common Elder. Sambucus Canadensis. Red Bridge. June 1. 



Hobble Bush. American Wayfaring Tree. Viburnum lantanoides. 

 Chicopee Row. Native. May 10. 



