XVII 
Blazing Star, etc. Many double forms, among the species of Helianthus, Core- 
opsis, etc., have been found in all stages of development. 
No distinct paragraph has been given to rare plants, as they could not be 
enumerated in this connection, but they are designated in the text. 
DISAPPEARANCE OF SPECIES. 
While catalogues and check lists are necessary to record the constant intro- 
duction of new species into our floral community, they are no less useful for 
writing obituaries of forms that have become extinct. 
Included among the species that are seemingly exterminated are: Viola cana- 
densis, L.; Desmodium marilandicum, F. Boott. ; Pirus americana, D C.; Trios - 
teum angustifolium, L.; Eclipta alba, Hassk.; Rhododendron nudiflorum, Torr.; 
Datura tatula, L. ; Myrica cerifera, L.; Triglochin palustris, L.; Carex vulgaris, 
Fries.; Juniperus sabina, L., Var. procumbens, Ph.; Azolla caroliniana, Witld. 
LOCALITIES OF SPECIAL INTEREST. 
There are certain areas in Cook County, Illinois, and Lake County, Indiana, 
which are of special interest to the botanist, because of the plants, which, in 
some instances, are found in them only. Prominent among the districts selected 
is the Calumet Region, embracing the territory drained by the series of lakes 
situated in the southern portion of Hyde Park township and that portion of Indi- 
ana adjacent to it. In this locality many rare forms of aquatic and bog plants 
are found, as well as several other species which are confined to Lake County, 
Indiana. Of the former class may be mentioned many of the Potamogetons, the 
Orchids, Utricularias, Junci and Xyris flexuosa, Muhl., while of the latter, num- 
bering over ninety species, are the Pyrola rotundifolia, L., P. rotun difolia, L., 
Var. asarifolia, Hook, and P. secunda, L.; Triglochin palustris, L.; Cypripedium 
acaule, Ait., and Carex richardsoni, R. Br. 
From this district some of the rare forms not recorded in the fifth edition of 
Gray’s Manual, were obtained, such as Gaura parviflora, Dougl., and Potamoge- 
ton fluitans, Roth. 
The only specimen of the Typha angustifolia, L., reported in the northern 
part of Cook County was found in a swamp called the ‘‘Skokie,” situated west 
of Glencoe. Unfortunately for collectors, this interesting spot has been drained 
and the wild forms so numerous in years past have given place to fields of wheat 
and corn. 
Another locality which merits notice is the strip of heavily timbered country 
extending through the central and northern portions of Cook County, and lo- 
cally known as the “Big Woods.” Here many of our representative trees are 
found as well as less frequent forms, while around their trunks twine the wild 
grape, woodbine, bitter-sweet and poison ivy. In the spring parts of this area 
are submerged and marshy, and abound with species of the Trillium, Arabis and 
Cardamine. Species of the Habenaria, Cypripedium and Orchis are here met 
with, as well as the Sanguinaria canadensis, L., and Oxalis violacea, L. During 
the summer and autumn the undergrowth is marked by species of Solidago, 
Aster, Helianthus, Eupatorium, Urtica, Pilgea and many others, while the fallen 
logs present a great variety of mosses and fungi. 
