2 
0 

ADDENDA. 
Serratula arvensis, Willd. 
Icon. Fl. Dan. 644. Engl. Bot. 975. 
Canada Thistle. d 
Flowers purple, smaller than those of Nos. 1, 2,3 or 4. Since 
printing the foregoing pages I have been directed for this 
plant by Mr. Collins to the neighbourhood of the forge at the 
corner of Vine-street and the Ridge-read, where I found it 
abundant. Mr. C, has found it elsewhere. Perennial. July. 
—— aa 
GYNANDRIA. 
Po Cypripedium humile, page 145. vol. 2, add to 
the English name, ¢ Woah’s Ark, 
Se 
‘The following plants, I am informed by Mr. Col- 
lins, have been found in this neighbourhood: 
VIZ. - 
Aster rigidius. 
Agrostis sobolifera, (flat rock-bridge, Schuylkill.) 
Chara glabra. 
‘Chara foliosa. 
Erigeron strigosum. 
No. 402. Elephantophus Carolinianus. 
Rudbeckia fulgida. 
No. 4038. Scleria paucifolia. 
Scleria triglomerata. 
No. 404. Uniola gracilis, (Jersey. ) 
No. 405. Viscum purpureum, Muhl. 
$< >—___ 
N. B. Cyperus minimus, for which I quoted Dr. Clever, on 
the authority of Mr. Nuttall, has not, the Doctor informs me, 
been found by him within the limits of this book. 
————>—_—_. 
Rhododendron maximum, or Great Mountain Laurel, I have 
found in the woods near Gray’s ferry, where it appears to be 
wild. July, 1818. 
