189 SIXTEENTH REPORT. 



Viola tricolor L. Pansy.— Occasionally escaping and persisting at least 

 for a tim(\ 



Viola rafinesquii Greene. Wild Pansy. Woods and open places. Often 

 abundant in old fields. Newton Tripp. 



Thymelaeaceae. Mezereum Family. 



Dirca palustris L. Leather-wood. Moose-wood. — Frequent in damp rich 

 woods; especiall}' near Sarnia. 



Elaeagnaceae. Oleaster Family. 



Shepherdia canadensis (L.) Nutt. Canadian Buffalo-Berry. — Occasional 

 in dry and sandy ground. Very abundant on the sand dunes at Port Franks. 



Lythraceae. Loosestrife Family. 



Decodon verticillata (L.) Ell. Water Willow. — Occasional in swampy 

 ground. Abundant in one place on the edge of a pond north of Sarnia, and 

 about the small lakes in the northeast part of the county. 



Lythrum alatum Pursh. Wing-angled Loosestrife. — Occasional in swamps 

 and damp meadows. Plentiful on the delta islands of St. Clair River. 



Lythrum salicaria L. Spiked Loosestrife.^ — Well established at Pt. Edward, 

 in meadow-like ground. 



Onagraceae. Evening Primrose Family. 



Ludvigia alternifolia L. Seedbox. — Occasional on the delta islands. 

 Noticed by Prof. John Macoun near Point Edward. Apparently infrequent. 



Ludvigia polycarpa Short and Peter. Many-fruited Ludwigia. — Occasional 

 in wet and swampy places. 



Ludvigia palustris L. (Ell.) Water Purslane. — Common in ditches, 

 muddy places, and on wet shores. 



Epiiobium angustifolium L. Great Willow-herb. — Common in damp 

 ground and open woods. Usually very abundant on burnt-over ground for 

 a couple of years. Recently it has acquired the name of fireweed. 



Epiiobium molle Torr. Downy W^illow-herb. — Li wet meadow-like places 

 near Port Franks. Apparently infrequent. 



Epiiobium densum Raf. Linear-leaved Willow-herb. — Frequent in damp 

 marshy ground. 



Epiiobium coloratum ]\Iuhl. Purple-leaved Willow-herb. — Occasional in 

 low dam}i ground. 



Epiiobium adenocaulon Haussk. Northern Willow-herb. — Verj' common 

 in rich damp o]ien ground. 



Oenothera biennis L. Common Evening Primrose. — Common in dry and 

 •sandy ground, especially along and near the Lake Huron shore. 



Oenothera fruticosa hirsuta Nutt. Hairy Sundrops. — Occasional in dry 

 and sandy ground near Port Franks. Newton Tripp. 



Oenothera pratensis (Small) Robinson. — Meadow Sundroj^s. Low ground 

 near Port Franks. Newton Tripp. 



Oenothera serulata Nutt. Tooth-leaved Primrose. — Occasional in sandy 

 ground along railways. An immigrant from the Avest. 



Circaea lutetiana L. Enchanter's Nightshade. — Common in damp open 

 woods and thickets. 



