APPENDIX.
397
Resembling, however, more the garden specimens than some I received from Mr. Nuttall.
97.  Helianthus giganteus, var. crinitus, Nuttall, Gen. II. p. 177.
98.  Helianthus.
I have not been able to determine this species, which is but indistinctly characterized by the imperfect specimens of the collection.
99.  Bidens minima, Pursh, 566.
As a variety of /3. cernua, I think them distinct.
XVIII. CLASS MONOECIA.
100.  Urtica procera, Pursh, p. 113. Common in Carolina and western country.
101.  Pinus banksiana, Pursh, p. 642. Found likewise on the Canada lakes.
102.  Pinus balsamea, Pursh, p. 639. On the mountains.
103.  Pinus nigra, Pursh, p. 640. Not rare on Pennsylvania mountains.
104.  Pinus alba, Pursh, p. 641. Distinguished by its incurved leaves.
105.  Pinus pendula, Pursh, p. 645. Black larch.
Hab. On the northern lakes and streams.
106.  Pinus microcarpa, Pursh, p. 645. Without strobilae.    Red larch.
Hab. Common along the northern lakes and streams.
107.  Thuja occidentalis, Pursh, p. 646. Likewise on Pennsylvania mountains. Vol. II.                  51