52 BOTANICAL GAZETTE [JANUARY 
folia have disappeared; while Lyonia ligustrum (Xolisma ligustrum), 
Ascyrum hypericoides, Eupatorium hyssopifolium, Rubus sp., 
Vaccinium atrococcum, Gaylussacia baccata (G. resinosa), Baptisia 
tinctoria, Rhus Toxicodendron (R. radicans), and Quercus mary- 
landica have established themselves. 
No sphagnum has been found, and none could be identified in 
the peat collected. The absence of typical peat bogs from the 
eastern shore of Maryland was noted by SHREVE,’ although 
sphagnum was found abundantly in the clay upland swamps. 
Hibiscus Moscheutos has apparently disappeared from these 
hollows in the ten-year interval, but whether this is due to the 
stress of changing ecological conditions or to the assiduous gathering 
of the plants cannot be stated. 
5. Heath—This formation shows a progression toward the 
development of a forest by a greater growth of the shrubs and 
trees, without much change from a floristic standpoint. 
B. WOODED REGION 
The thicket and forest formations have received no detailed 
study at either time, but the collections made this year indicate - 
that the pine stage, represented by Pinus Taeda and P. rigida, is 
being succeeded by the oak-hickory stage, represented by young 
plants of Quercus marylandica, Q. alba, Q. velutina, Q. stellata 
(Q. minor), Q. falcata (Q. digitata), Carya glabra (Hicoria glabra), 
and C. alba (H. alba). The list of associated forms is incomplete, 
but it is interesting to note that the species found are not those 
characteristic of similar situations in New Jersey or southward 
but that many of the plants found in clay and sandy loam areas 
of the Talbot terrace of Maryland are present (SHREVE Joc. cit.). 
According to the manuals, the northern limit of Myrica cerifera, 4 
typical pine barren plant, is Maryland. It was found, however, at 
Rehoboth and is mentioned by STONE’ as occurring in the southern 
5 SHREVE, F., The plant life of Maryland. Md. Weather Service, Spec. Publ. II. 
IgI0. 
6 Harper, R. M., Science 25:530-541. 1907. 
7StonE, WITMER, The _ of southern New Jersey. Rep. N.J. State 
Museum. Igio. 
