38 FLORA ORCADENSIS. 
Genus CVIII.—PETASITES (Linn.) 
214. P. vULGARIS, Butter-bur. Luckily searee. 
Extremely difficult to eradicate. Churehyards— 
Shapinsay and St. Andrews; Burn of Aikersness, 
Evie; Birsay, Wc. 
Genus CIX.—SENECIO (Linn.) 
215. S. VULGARIS (Linn.), Growndsel. Common. 
216. S. Jacop#a (Linn.), Ragwort. Common on 
dry, sandy pastures. 
Var. flosculosus (Jord.) This variety is frequently 
met with among the above. It seems to me there are 
several grades from this rayless variety to those with 
full rays. 
217. S. viscosus (Linn.), Stinking Groundsel. 
This plant was reported by Dr Clouston. It may 
have been a mistake for sylvaticus. Not since met 
with as far as I know. 
218. S. sytvaticus (Linn.), Mowntain Groundsel. 
Very rare. 
Found it on barn of Bigging, Birsay ; and among 
whins above Established Church, St. Andrews (M. 
Spence); Smogrow, Orphir (Dr Boswell) Dr 
Fortescue says, “It seems to have disappeared at 
the last place. 
219. S. aquaticus (Huds.), Marsh Ragwort. 
Common. 
These are called “tirsics” in East Mainland, 
“tirsoos” in West Mainland. 
