MICHIGAN ACADEMY OF SCIENCE. 
1S1 
290. Tilia Americana, Lin. Bass Wood. 
Woods. Common. 
Order XXV. Viol ales. 
Family 55. Hypericaceae. 
300. Hypericum corymbosom, Mold. St. Johnswort. 
Low grounds. Rare. 
Family 50. Cistaceae. 
301. Helianthemum Canadense (Lin.) Mx. Frostwort. 
Sterile grounds. Rare. 
302. Helianthemum majos (Lin.) B. S. B. Frostwort. 
Sterile groonds. Frequent. 
These species are also known as Frostweed and Rock Rose. 
The herb is a commercial drug under the name of Frostwort and 
is employed in medicine as an astringent, tonic, and alterative, 
chiefly in scrofulous diseases. 
303. Lechea villosa, Ell. Pinweed. 
Hillsides. Frequent. 
Family 57. Violaceae. 
304. Viola conspersa, Reic-hb. Dog Violet. 
Swamps. Common. 
Tn summer the stems are elongated and creeping, bearing peta- 
liferous flowers all through the summer and fall until covered bv 
snow. 
305. Viola cucullata, Ait. Marsh Violet. 
Reed and mud swamps. Common. 
300. Viola papilionacea, Ph. Blue Violet. 
Open woodlands. Common. 
307. Viola rostrata, Pursh. Long spurred Violet. 
Swamps. Common. 
308. Viola scabriuscula, (T. & G.) Schw. Yellow Violet. 
Woodlands. Common. 
309. Viola sororia, Willd. Violet. 
Woodlands. Common. 
310. Viola vagula, Greene. Violet. 
Marl bogs. Frequent. 
Order XXVI. Myrtales. 
Family 58. Oenothera ceae. 
311. Epilobium coloratum, Muhl. Willow Herb. 
Swamps. Common. 
312. Oenothera muricata, Lin. Evening Primrose. 
Fields and waste places. Common. 
A commercial drug and is employed as a nerve sedative or 
antispasmodic in whooping cough, hiccough and spasmodic asthma. 
313. Circaea Canadensis (Lin.) Muhl. Enchanter’s Nightshade. 
Woods. Common. 
The American plant appears to be readily distinguished from 
the European as follows: Calyx tube not over 1 mm. long; in 
the European it is about twice as long; calyx lobes broadly ovate, 
obtusish or acutish,, two to three mm. long; in the European nar- 
rowly ovate or ovate lanceolate and acuminate, three to four mm. 
long; the fruit is about *4. larger and proportionately rounder, 
than in the European; stamens and style about equaling the petals; 
