io8 The Botanical Gazette. [April, 



identity unmistakable. On the whole it seems best that a 

 species of such questionable validity should be dropped. 



To the list of California willows, as known ten years ago, 

 not a single addition has been made, though it is highly prob- 

 able that 5. rostrata. S. vcstita and 5. reticulata will be found 

 in the Sierra Nevada; and 5. Hookcriana (known to occur 

 abundantly along the coast of Oregon down almost to the 

 boundary line) may be confidently looked for at the mouth 

 of the Klamath river. 



Rock ford, Ills. 



Notes on the flora of the St. Croix region 



K. G. KILL. 



The Dalles of the St. Croix and the neighboring rapids are 

 a piece of scenery very attractive to one seeking the beautiful 

 and picturesque in nature. They are formed by a belt of 

 trappean rocks of the copper-bearing series which crosses the 

 river in this region, making several ridges from 200 to 300 

 feet high. Softer sandstones of the Potsdam or Cambrian 

 formation, mingled with conglomerates and shales at the 

 points of contact, are laid down upon the trap in horizontal 

 strata, or abut against the sides of its uplifted beds, clearly 

 showing their unconformability. Through these rocks the 

 river has worn a deep gorge, and by a series of rapids and low 

 falls rushes along between bluffs descending rather steeply as 

 wooded slopes. On the Minnesota side of the stream the 

 bluffs recede from its banks far enough to leave a nearly level 

 spot on which stands the lower part of the village of Taylor's 

 Falls. On the opposite slope, in the state of Wisconsin, lies 

 the village of St. Croix Falls. In the midst of the rapids the 

 river is spanned by a bridge at a point where it becomes quite 

 narrow at the head of a defile, making it easy to cross to 

 either side. For some distance below the bridge the water 

 rushes on over the sloping rocks in impetuous swirls, then 

 makes a sudden bend and glides on with comparative placidity 

 between cliffs from 100 to 200 feet high. The walls of these 

 cliffs are either vertical or nearly so. The Dalles are properly 

 that portion of the gorge beginning at the bridge, and fur- 

 nish much the most imposing part of the scenery. It con- 



