CATALOG OF PLANTS. 101 



523. Oxalis stricta L. Yellow wood-sorrel. — Common on damp or 



dry ground. 



524. Geranium maculatum L. Wild craneslsill. — Common in rich 



open woods and in open places. 



525. Geranium robertianum L. Herb robert. — Abundant in shade 



on North Island and near Harbor Beach. ''Along the 

 beach near Grindstone City, also in rocky soil inland." 

 Davis. 



526. Geranium carolinianum L. Carolina cranesbill. — Occasional on 



dry ground in the villages. 



527. Geranium bicknellii Ikitton. Bicknell's cranesl^ill. — On the edge 



of overhanging rocks at Pointe aux Barques. 



528. Geranium pusillum Burra. f. Small-flowered cranesbill. — 



Noticed as an occasional lawn weed in the villages. 



529. Zanthoxylum americanum Mill. Northern prickly ash. — 



Common on rich damp ground throughout the sand region. 

 Specimens over three inches in diameter and 15 feet high 

 were observed. 



530. Polygala paucifolia Willd. Fringed polygala. — On poor and 



sandy ground east of Bayport, near Rush Lake, and on 

 Charity Island. 



531. Polygala polygama Walt. Racemed milkwort. — On sandy 



ground on Sand Point. 



532. Polygala senega L. Seneca snakeroot. — On poor ground west 



of Caseville. Apparently rare. 



533. Euphorbia polygonifolia L. Seaside spurge. — Observed only in 



drifting sand on the lake shore where it is often abundant. 



534. Euphorbia preslii Guss. Upright spotted spurge. — On dry open 



ground near Sebewaing. 



535. Euphorbia maculata Engelm. Milk purslane. — Frecjuent in 



villages, about country dwellings and fishery buildings. 



536. Euphorbia hirsuta (Torr.) Wiegand. Hairy spurge. — Frequent 



along railroad near Caseville and Port Austin. 



537. Euphorbia corollata L. Flowering spurge. — On poor dry ground 



at Port Austin and Bayport. Not common. 



538. Euphorbia cyparissias L. Cypress spurge. — Common, especi- 



ally on sand\' ground, in and near villages, about country 

 dwellings and in cemeteries. 



539. CalUtriche palustris L. Water fennel. — "Dry bed of branch of 



Pinnebog River, Hume Township." Davis. 



540. Rhus typhina P. Staghorn sumach. — Very abuntlant on damp 



ground and on sand dunes. 



541. Rhus copallina L. Dwarf sumach. — "Sand dunes." Davis. 



