184 
THIRTEENTH REPORT. 
Print us cerasus L. Common cherry. Sour cherry. — Spreading near 
an old garden at the north end. Charity Island. 
Primus americana Marsh. Wild plum. — Occasional on the west side. 
Charity Island. 
Trifolium repens L. White clover. — About the lighthouse and occa- 
sional in other places. Charity and Little Charity Islands. 
Desmodium canadense (L.) DC. Showy tick-trefoil. — Occasional on 
and near the beach. Charity Island. 
Lespedeza capitata Michx. Round-headed bush clover. — Occasional 
on sand ridges. Charity Island. 
Lathyrus maritimus (L.) Bigel. Beach pea. — Frequent on Charity 
Island in sand on the beach, a good sand binder. Abundant on Little 
Charity Island. 
Latlu/rus palustris L. Marsh vetchling. — Frequent in low grassy 
places. Charity and Little Charity Islands. 
Lathy ru s palustris myrtifolius (Mulil.) Gray. Myrtle-leaved marsh 
pea. — Occasional in damp places. Charity Island. 
Apios tuberosa Moench. Wild bean. Groundnut. — Frequent through- 
out. Charity Island. 
Amphicarpa monoica (L.) Ell. Hog peanut. — Frequent in thickets. 
Charity Island. 
Geranium macula turn L. Wild cranesbill. — Common in rich woods. 
Charity Island. 
Geranium robertiamim L. Herb Robert. — Abundant in rich woods on 
the east side. Charity Island. 
Euphorbia preslii Guss. Upright spotted spurge. — Occasional in dry 
ground. Charity Island. 
Euphorbia cyparissias L. Cypress spurge. — In sand about the light- 
house. Charity Island. 
Bhus typhina L. Staghorn sumach. — Frequent in dry or damp ground. 
Charity and Little Charity Islands. 
Rhus toxicodendron L. Poison ivy. Poison oak. — Very abundant 
over the islands. Stems upright, often 2 or 3 feet and more high with 
leaves and fruit at the top. Although the islands are mostly covered 
with a dense forest, not even one case of climbing trees was noticed. 
Perhaps it will be interesting to note that at Point Pelee on the north 
shore of Liake Erie, Essex Co., Ontario, about 150 miles farther south 
poison ivy often takes complete possession of trees 50 feet and more 
liiah and the vine is often more than three inches in diameter. Some 
authors recognize the tree climbing form as Blurs toxicodendron radicans 
(L.) Farr. Climbing poison ivy. Charity and little Charity Islands. 
flex verticillata (L.) Gray. Winterberry. Black alder. — Common es- 
pecially about the pond. Charity Island. 
Gelastrus scandens L. Climbing bittersweet. — Known in Michigan and 
western Ontario as bittersweet. Common in woods and thickets. Char- 
ity Island. 
Acer spicatum Lam. Mountain maple. — Occasional in woods. Charity 
Island. 
Acer saccharum Marsh. Sugar maple. — Frequent especially on the 
east side. Charity Island. 
Acer saccharin-urn L. Silver maple. — Occasional in woods with other 
trees. Charity and Little Charity Islands. 
