102 CATALOG OF PLANTS. 



542. Rhus vernix L. Poison sumach; poison dogwood. — Frequent 



in swampy places. 



543. Rhus toxicodendron L. Poison ivy; poison oak. — Abundant 



on sand dunes and generally in dry sandy or rich damp 

 ground. 



544. Ilex verticillata (L.) Gray. Black alder; winterberry. — Common 



in low damp ground. 



545. Nemopanthus mucronata (L.) Trel. Mountain holly. — In 



swampy places near Caseville and Rush Lake. Apparently 

 infrecjuent. 



546. Evonymus obovatus Nutt. Running strawberry bush. — In 



damp shaded places at Caseville, Port Austin, and Stony 

 Island. 



547. Colastrus scandens L. Bittersweet. — Common along streams, 



in open woods and thickets. 



548. Acer spicatum Lam. Mountain maple. — Frec[uent in damp 



woods. Also on the islands. 



549. Acer saccharum Marsh. Sugar maple. — Frequent on rich 



ground with other trees. Charity Island. 



550. Acer saccharinum L. Silver maple. — Frequent on rich ground 



along streams with other trees. 

 55L Acer rubrum L. Red maple. — Common on rich damp ground 

 with other trees. 



552. Acer negundo L. Box elder. — Cultivated as an ornamental tree 



and spreading. 



553. Aesculus hippocastanum L. Common horsechestnut. — An orna- 



mental street tree but apparently not spreading. 



554. Impatiens biflora "Walt. Spotted touch-me-not. — Common on 



damp shaded ground. 



555. Ceanothus americanus L. New^ Jersey tea. — Frequent on sand 



dunes and flat sandy ground. 



556. Ceanothus ovatus Desf. Smaller red-root. — Common on sand 



dunes and flat sandy ground. 



557. Psedera vitacea (Kneer.) Greene. Virginia creeper. American 



ivy. — Common in woods and thickets and along streams. 



558. Vitis bicolor Le Conte. Summer grape.— On dry ground near 



Rush Lake and Bayport. Apparently rare. 



559. Vitis vulpina L. River-bank grape; frost grape. — Common 



along streams and on sides of sand dunes, often acting as a 

 sand binder. 



560. Tilia americana L. Basswood. — Common on rich ground with 



other trees. 



