PROCEEDINGS-PERTHSHIRE SOCIETY OF NATURAL SCIENCE, lxxxix 
nigricans grows here and there on the banks, and near the mouth of 
the burn Salix acutifolia has been planted. On reaching the river 
May several local plants, such as Veronica montana , were noted; but 
the chief find was what appears to be a rare variety of Cardamine 
amara. This plant, which, although not uncommon in Perthshire, 
is rather a local British plant, has white flowers, but nearly opposite 
the mouth of the Kelty Burn a large bed of it was found in which all 
the flowers were rose-coloured. In addition to this distinction of 
colour, the shape of the leaflets seems rather different from that of 
the type. On this grounds I have thought it worth separating under 
the varietal name lilacina. Nothing much worthy of note was seen 
till Invermay was reached. Here the interest of the beautiful walks 
that lead through the “ Bilks ” is much enhanced to the botanist by 
the many local plants which adorn the banks. Amongst those seen 
on this occasion were Adoxa Moschatellina, Veronica montana , Beton- 
ica officinalis , and the curiously coloured and structured Neottia 
Nidus-avis and Lathrcea squamaria —the former a saprophyte and the 
latter a parasite. The host-plant of Lathrcea in Perthshire is chiefly 
elm ( Ulmus montana ), but in Invermay it grows on roots of plane 
(Acer Pseudo-Platanus), and also on roots of yew (Taxus). After 
leaving Invermay the only noticeable plant seen on this excursion 
was Anthemis arvensis , which grows near Forteviot Station, whence 
we returned to Perth. 
On the 26th of June we went to Pitlochry with the intention of 
exploring the West Bank of the Tummel. On our way to Clunie 
Bridge we found that the garden wall of a recently-built house had 
been erected on the station for Galium erectum , and that this local 
plant has apparently ceased to grow there. After crossing the river 
by Clunie Bridge we proceeded down the stream, searching the rocky 
banks which add so much to the beauty of this portion of the river. 
Amongst the more noticeable plants seen here may be mentioned 
Car ex remota , C. pallescens , Rosa spinosissima , Astragalus hypo glottis , 
and a Symphytum , which is apparently S. officinale. Nothing else of 
any great importance was observed till we got below Pitlochry, where, 
on the shingles and river bank, some very interesting plants were 
obtained. The most important of these is Salix Doniana Sm., a 
hybrid between S. purpurea and S. repens . S. repens is probably not 
rare along the course of the river, but one small patch only of S. 
purpurea was observed, and S. Doniana was growing in the midst of 
it. The interest attaching to S. Doniana is this, that it had not been 
gathered in Britain from the time when it is said to have been 
discovered by Don until this day. It seems not improbable that 
Don got it somewhere in Forfarshire or Perthshire, but its recorded 
history does not make this clear. At anyrate it can now be claimed 
as a British plant without any doubt. Next in importance to S. 
Doniana was the discovery of Poterium Sanguisorba. This is a very 
rare plant in Perthshire. It grows, or grew, near Moncreiffe Gardens, 
and on the railway bank near Abercairny Station, but in both of these 
places is very doubtfully indigenous. I have found it sparingly on the 
top of Balthayock Hill, where it seemed to be wild. On the shingle 
below Pitlochry it looks like a wild plant, but it is impossible to be 
