Rbodora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 13. December, 1911. No. 156. 
THE TYPHAE OF MARYLAND AND VIRGINIA. 
Ivar TIDESTROM. 
In the manuals of recent dates! and also in the North American 
Flora? the two circumboreal species Typha latifolia and T. angusti- 
folia are credited to our region. These are readily distinguished by 
their floral structures and particularly by the pollen grains — the 
latter having simple grains while in the former they are in tetrads. 
Besides, the commonly contiguous spikes in 7. latifolia and its much 
brcader leaves serve to distinguish it from T. angustifolia. In the 
latter the spikes are separated by an interval of from 1 to 5 cm. or 
more and the leaves, at least in the normal form, are only one-half as 
wide or about 6 mm. more or less. There are other characters which 
need not be mentioned, since they are given in the manuals. 
In the Bracteolatae or T. angustifolia group there are some variants 
which approach 7. latifolia in outward appearance but have the floral 
structure and remcte spikes of the other species. Of these we find 
one in Maryland and Virginia. 
On October 17, 1909, Dr. C. L. Alsberg and myself, while botanizing 
in the neighborhood of Cape Henry, came upon an area of Typha 
about one mile or more west of the lighthouse. At first I thought we 
had 7. latifolia but upon closer examination I noticed that we had a 
plant before us with leaves as broad as those of 7. latifolia and the 
remote spikes of the other species. I remarked to my companion 
that we had a new form or perhaps an old forgotten one before us. 
Since the variation in the size and form of our water- or marsh-plants 
ranges between rather wide limits, I did not wish to propose a new 
1 Britton, Man. 38, 1905. Gray’s Man. 68, 1908. 
1N. Am. Fl. 171: 3-4, 1909. 
