RECORDS OF SCOTTISH PLANTS FOR 1891 119 



will be little needed, because states of the plant composed 

 entirely of perfoliatus-\\]<e shoots rarely, or never, occur. 



Although I have examined many hundreds of fresh stems 

 of this species, I have never found a single instance in which 

 the terete stem of perfoliatus was approached even in the 

 slightest degree ; nor any instance in which the flowers were 

 not abortive ; yet both terete stems and fertile spikes may 

 occur, and should be carefully sought for. Again, individual 

 specimens of the two species now in question may have a 

 greater or less number of ribs in some of the leaves than is 



^j 



usual, or some other character may disappear, or be present, 

 in one or more branches ; but these need never mislead the 

 youngest student if care be taken in observing the aggregate, 

 characters of such doubtful specimens. For instance, a cul- 

 tivated plant, grown for three years, has produced a single 

 branch with leaves indistinctly serrulated somewhat towards 

 those of P. crispus ; but in this case the stem was quite 

 typical, and the hundreds of other specimens from the same 

 rootstock are all normal undulatus. 



The Potamogetons collected by Col. Stirling and Mr. 

 Kidston during the past two summers present many remark- 

 able forms, more than one of which seem new to our Flora. 

 A rich harvest in this genus lies awaiting the hands of Scottish 

 naturalists to gather it, a task that can only be successfully 

 accomplished by resident workers. 



RECORDS OF SCOTTISH PLANTS FOR 1891, 

 ADDITIONAL TO "TOPOGRAPHICAL BOT- 

 ANY," Ed. 2. 



By ARTHUR BENNETT, F.L.S. 



AGAIN these records tell up to a larger number (320) than 

 could have been anticipated ; I must therefore be as brief as 

 possible in my remarks. 



I wish most earnestly to impress on any botanist seeing 

 these records, that I shall esteem the rectification of any 

 errors even more than additional records. 



