APPENDIX. 



No. I. ON THAlicTRUM SAXATILE. 



As our plants were not examined in the flowering state there 

 remains some doubt concerning the species to which they belong. 

 Indeed it is possible that one or more of them may be the 

 T. Jlexuosum (Bernh.) The T. saxatile and T. jlexuosum differ in 

 the following respects. 



1. T. flexudsum (Bernh.) ; stem striate ; flowers drooping, in 

 a long leafy panicle ; carpels narrowly oblong, gibbous. 



Stem less zigzag than that of T. saxatile, usually much branched. 

 Fruitstalks often patent. Carpels curved, gibbous on one side 

 above on the other below, rather acute at one or both ends. 



2. T. saxdtile (Schleich.) ; stem scarcely striate ; flowers erect, 

 in a nearly leafless panicle ; carpels oval. 



Stem zigzag, usually unbranched below. Panicle closer. Fruit- 

 stalks ascending. Carpels nearly regularly oval, rather blunt at 

 both ends. Leaves smaller and more compact. 



The latter seems to be the T. saxatile of Reichenbach (Icones, 

 t. 34) and probably of Schleicher, although the latter botanist 

 perhaps confounded T. Kochii (Pries) with it. It is much nearer 

 in appearance to T. minus than either of the other species, but 

 was placed doubtfully with T. jlexuosum by me. 



If I am correct in believing that its flowers do not nod and 

 that its carpels are nearly exactly oval, it would seem to be 

 properly separated from all our other species. It is apparently 

 the T. cottinum of Reichenbach's "Flora exsiccata" No. 691, and 

 has its lower leaves crowded together and nearly sessile when 

 growing amongst short herbage. The T. cottinum (Wallr.) has 



