HARPER: PLANT POPULATION OF MICHIGAN 37 
the incompleteness of the data, and the great changes that have 
been made by lumbermen and others, percentage numbers are 
not attempted. But the numbers when finally determined prob- 
ably will not depart much from a geometrical progression.* (The 
commonest herb, however, seems to be about four times as abun- 
dant as the next one.) The rarer species, and all cellular crypto- 
gams, are omitted, because they make up such an insignificant 
part of the total vegetation. 
TREES ; 
is Lane IBTICIN Re ie Cy eh ee eal Cues Swamps and bogs 
< MG GrtA i os sk ee es a ee 
Ps Sent eo Sandy uplands, etc. 
Te RoC ERR ERETE OG as or ee giao Rich uplands 
‘Y; SOWew COneieneis, 3c ee ae ay 
pg Way tate i Prt bs Wineaat, goa ee rice a eae eg ER Pri ie 
1 a MT AS OUR he Pee es oe ies ews Swamps and bogs 
VARIG DAR IBR yn es ek 
CGR RN ek Pe ae ee Various habitats 
I 2 idee OCIS 2 es cea oe he Rich uplands 
AY Pewee WiNTe 2 a Se ee ee i es mps 
Pe RR SOOGI so se ok eo ne Sandy uplands 
re CA SUI Oe ee a Richer soils 
Quercus borealis —— FEE ME NCU eee IR Sandy uplands 
Y PiChe CANAOONEE oe Swamps and bogs 
VY Betula lntes ooo i Se os ate Rich woods 
Y Pinas Bauksiane 62 os a es Poorest soils 
Quercus alas ie ra a a Uplands 
Y Braxinuy americana. 6 525..5 sae ae eee Richer soils e 
SMALL TREES 
V Betula panyritera ci a ees ak ys Various habitats 
Y Populus enenliides ras Une ee Oe ice eens Burned areas mostly 
Y Populus cers ate OE Oates a a - ie 
© Prunus peunsyivanica: ... 205.6. b os ee ss ey a 
Y Populus ia ees ie. Ce pisos Rae ies ae Lake shores, etc. 
Oatrea ViTeiAata 66 e655 ee Rich uplands 
Y Salix Qeviatiliel 6 es ees Lake shores, etc. 
LARGE SHRUBS AND V. 
Amys Weenie ya ee ea > Swamps, etc. 
W Sable lita ee ee we ee Wet places 
Y SAue St os we sees ee ee Swamps, etc. 
VY Acer pennsyivanicnm. 2). 0.25. 2.6 ee Rich woods 
* See Torreya 13: 244. Oct. 1913. 
~ Long known as Q. rubra. See Torreya 17: 135. hae IQI7. 
t This includes several unidentified species. If y had been separated they 
would of course stand lower in the list. 
