ADDENDA. 
To the Mackinaw Island, list of plants on page 218, the following 
observations, corrections, and additions should be made. 
Equisetum pratense Ehrh. Thicket horsetail. Abundant at foot of 
rocky cliffs. 
lycopodium annotinum L. Occasional in woods. 
Carex crawfordii Fernald, should be omitted and the following in- 
serted. 
Carex bebbii Olney. Bebb’s sedge. Occasional in damp open ground. 
Allium tricoccum Ait. Wild leek. In rich woods. Apparently in- 
frequent. 
Ulmus americana L. Three large native trees and a number of small 
ones noticed at the foot of the bluff near the Marquette monument. 
Rumex mexicanus Meisn. Willow-leaved dock. In damp sand on and 
near the lake shore. Apparently infrequent. 
Salsola kali tenuifolia G. F. W. Mey. Russian thistle. As a weed in 
the village. 
Amaranthus graecizans L. Tumble weed. As a weed in gardens and 
about the streets of the village. 
Amaranthus blitoides Wats. Prostrate amaranth. Streets of the vil- 
lage. 
Stellaria longipes Goldie. (?). Long-stalked stitchwort. Thickly 
matted in one place on the east side of the island. 
Claytonia virginica L. Noticed as frequent in 1913. 
Thalictrum dasycarpum Fisch. & Fall. Purplish meadow rue. Occa- 
sional on borders of woods. 
Aquilegia vulgaris L. Garden columbine. Double-flowered form grow- 
ing wild on and near the lake shore. 
Sanguinaria canadensis L. Noticed as occasional in 1913. 
Lepidium apetalum Willd. Apetalous peppergrass. About the village. 
Brassica oleracea L. Cabbage. Apparently growing wild near the 
water works. 
Sisymbrium altissimum L. Tumble mustard. As a weed about the 
village. 
Radicula armoracia (L.) Robinson, 
escape in several places. 
Tiarella cordifolia. False miterwort. 
west side. 
Horseradish. Noticed as an 
Occasional in rich woods on the 
Ribes cxyacanthoides L. is probably not on the island. 
Pyrus americana (Marsh.) DC. is apparently not growing wild on the 
island, but there are perhaps 25 or more trees of P. sitchensis (Roem.) 
Piper, and this was noticed as far south as Alpena. 
Melilotus officiralis (L.) Lam. Yellow melilot. Occasional as a weed. 
Melilotus alba Desr. Sweet clover. Noticed along the streets of the 
village. 
Medicago sativa L. Alfalfa. Occasional as an escape. It is being 
successfully cultivated on the island. 
