BOTANICAL INFORMATION. 207 
tance from the town. My notes of this, to me, most instructive 
and agreeable ramble, are unfortunately missing, which prevents 
me from giving more than a very imperfect list, from memory, of 
the species observed, some of which are mainly or entirely con- 
fined to the rock in question. This is the case with the pretty 
and curious portulacaceous plant Talinum teretifolium, which grows 
on the bare Serpentine in the manner of a Sedum, of which it has 
quite the habit, with the almost indestructible vitality of our own 
S. Telephium, or of Bryophyllum calycinum of India. For dry 
rock-work, this would, perhaps, prove as eligible as ornamental, ' 
smce no drought would injure it, however long continued. 
Another plant, nearly confined here to this formation, is the hand- 
some grass Atheropogon apludioides, the anthers of which are of a 
lovely vermilion or cinnabar colour. Scirpus (Fimbrystilis ?) 
Baldwinianum grew abundantly in plashes between the sterile 
and'denuded banks of Serpentine, which is, perhaps, the polar 
limit of this rather southern than northern species. The other 
plants, pointed out by my kind guide, were Polygala ambigua and 
verticillata, Lobelia Claytoniana, syphilitica, and inflata, (L. car- 
dinalis, Y had seen abundantly elsewhere in this vicinity). Con- 
volvulus panduratus, Cyperus diandrus, Asclepias verticillata, with 
many more I cannot now call to remembrance. Abutilon Avi- 
cene is frequent by way sides about the borough, where Dr. Dar- — 
lington pointed out to me a variety of Arctium Lappa with pin- 4 
natifidly incised leaves. y 
In the garden of Mr. Joshua Hoopes, a member of the Society. 
of Friends, and a zealous cultivator of indigenous and foreign trees 
and shrubs, to whom my warmest thanks are due for his many 
good offices during my stay at West Chester, grew noble plants, 
at least six feet high, of Tripsacum dactyloides, from a wild station 
in the county. This fine grass, of so tropical a character in size, 
habit, and structure, is now known to extend as far north as Con- 
necticut. 
Thad the pleasure whilst here of being introduced to Dr. Rivinus, 
a lineal descendant of the great German systematic botanist of the — — 
seventeenth century, himself, I believe, a native of Germany, and — - 
Y2 E 
