XVI 
five cords to the acre. Among our seventy-one species and varieties, the oaks, 
ashes and walnuts form the chief lumber trees, while the soil and climate join in 
supporting many introduced forms of ornamental trees. The Tulip tree (Lerio- 
dendron tulipifera, L.), Kentucky Coffee tree (Gymnocladus canadensis, Lam.), 
Honey Locust (Gleditschia tricanthus, L.), the catalpas and willows, with elms, 
maples and poplars are ornaments for streets, residences and parks. The most 
characteristic and abundant trees are the oaks, of which there are eleven species. 
The scarlet, white, red, bur and black oaks (tinctoria, Bartram) are the most com- 
mon forms. The black (nigra, L.), laurel, scarlet, swamp white and swamp 
Spanish oaks are occasionally reported. 
The ash trees, represented by the white, green, red and black, are only met 
with locally, while the five species of maples, with the exception of the sugar 
maple, are generally distributed. Hickories are plentiful in the woods, the tall 
cottonwoods being more closely associated with civilization. One tree not pre 
viously reported for this section and about which there has been much discussion, 
is the Beach Plum (Prunus maritima, Wang.). Its presence here has, however, 
been settled beyond all question by careful study of the species. 
Of our willows, six are trees, which are generally distributed. Of the ten 
species of trees that cross the continent, five are found within our limits. Seven 
of the fifteen trees that are found at intervals from the Atlantic to the Pacific are 
counted among our flora, while the Salix amygdaloides, the only tree found 
throughout the whole region extending from the Southern Pacific to the Atlantic, 
is here included. The Hop-tree (Ptelia trifoliata, L.), is the only species of the 
genus found in the region, while the Negundo aceroides, Moench., is the sole 
representative of the genus of either the Atlantic or the Pacific regions. 
PLANTS OF INTEREST. 
Among the various forms recorded in this Catalogue, some merit special 
mention by reason of peculiarities in form or habit. 
Prominent among these plants of interest are the so-called insectivorous 
plants. Under this enumeration are two species of Drosera, the Sarracenia pur- 
purea, L., and the Utricularias. The latter grow in ditches and capture water 
insects and small fish in their pouch-like leaves. 
Situated along the shore of Lake Michigan is a class of alien plants whose 
natural habitat is in the vicinity of salt water. Of these saline forms the Beach 
Plum has already been spoken of under the title of trees. All along the shore 
of the lake the bright flowers of the Beach Pea (Lathyrus maritimus, Bigelow) 
can be seen during the summer months lifting their heads above the sand, while 
among them at Evanston and also at Wolf Lake and Clarke, Ind., the Saltwort 
(Salsola kali, L.) is sparingly found. Leaving the lake shore for the more marshy 
districts inland, several parasitic forms are found. Under foot the corpse plant 
and cancer-root rear their pale forms above decaying vegetable matter on the 
roots of other plants, while three species of the Dodder twine their waxy stems 
around the stalks of the Helianthus and other species of Compositas. Occasion- 
ally exceptional forms, such as albinos, flowers differing in color from the char- 
acteristic hue and double forms, are recorded. A number of albino forms are in- 
cluded, among which may be mentioned the Cranesbill, Red Clover, Columbine, 
