Classification of Species. 
49 
son. Here Sphagna are found in abundance along with the flow¬ 
ering plants characteristic of such regions. 
Of the 729 flowering plants here listed, 626 are Indigenous to 
Wisconsin. These, with the exception of nine species, are 
natives of Dane county and of the special portion of it under con¬ 
sideration as well. Of the 103 introduced species, Salsola Kali 
came from the eastern states; Robinia pseudacacia , Mollugo ver- 
ticillata , Helianthus annuus, Phlox paniculata and Tecoma radC 
cans from the middle and southern states; Ipomoea purpurea , 
Amarantus retroflexus and Chenopodium ambrosoides , var. anthel- 
minticum from tropical America; AEsculus Hippocastanum from 
Asia; and Abutilon Avicennce and Polygonum Orientale from 
India. The remaining ninety-one are European. Probably 
sixty of the introduced species have been cultivated as plants 
useful to man. Salsola Kali and Mollugo verticillata are Ameri¬ 
can weeds that are becoming widely distributed, though not es¬ 
pecially troublesome. The remaining forty-one have come to us 
unbidden as the accompaniments of immigration and importa¬ 
tion from foreign lands and include most of our troublesome 
weeds. 
The moss flora (including the liverworts) of Madison and 
vicinity is not especially rich. The absence of the most favor¬ 
able conditions, such as pine or dense hard wood forests and 
peat bogs, together with the general cultivation of the soil, con¬ 
spire to keep out or drive out many forms that otherwise might 
be expected in this latitude. The lack of the necessary moist¬ 
ure on the rock exposures about the lakes prevents the growth 
of many forms occurring in damper spots in the southern part 
of the State. 
Of the 150 species and varieties identified, fifteen are liver¬ 
worts, distributed as follows : Jungermanniaceoe , five; Antho- 
cerotacece, two; Marchantiacece , five; and Ricciacece, three. The 
remaining 135 include forty-three Hypnums , ten Dicranums y 
eight Bryums , five Polytrichums , six Orthotrichums , four 
Mniums and fifty-nnie species distributed among thirty-one 
genera, not more than three species occurring in any one genus. 
Among forms of rare or of local occurrence, the following may 
be noted: Pylaiscea subdenticulata , P. polyantha ,, Leslcea Aus- 
