148 BOTANICAL GAZETTE [FEBRUARY 
as “fat” and “starch” trees were recognized. Those species which 
retained small quantities of starch corresponded in all cases to the 
structure of “starch” trees, whereas those in which conversion was 
most rapid were of the “‘fat”’ tree type. Although species which re- 
tained definite starch reserve during the winter are absent from this 
locality, certain of the facts seemed to give limited support to the 
TABLE I 
Material October December February May 
Populus tremuloides........... and O oO O S and O 
Populus balsamifera........... and O oO oe ee ae heer Et 
ee POON a ks and O O Sena pret: Pees her 
Shepherdia canadense.......... and O O O S and O 
Betula subcordata.............- Bh, Bein Wea SE 
Amelanchier alnifoliz.......... SAG ek O S and O 
! SCRE Sha aes and Oc (eis ckess O S and O 
Pyros rotundinite.. 6. 6ss. ess SandO | 0 O O 
Cornus canadensis............. O O O 
L ea borealis var. americana.| SSandO | O O oO 
Mitella WHOS ie ee ee ey SSandO | O 2 NEA eed one a ae 
Corvyiis rostrata 72.255 Send Oo | ore Oo S and O 
Picea canadensis i) isc. ean SSandO | O BL egy frees eee pence = 
Prius Banksians. 3 oo ous: oO O Ce awe ae 
Led denlandicum.. 3G 64... oe a Bee Or eee eaten! 6) Penge ey ree en S and O 
Arctostaphylos Uva-ursi........ O oO O S and O 
Vaccinium Vitis-Idaea......... we NG at as one yes Ae kas rae gg War wae rarer e 
Vib m pauciflorum......... and O O oO S and O 
Prunus pennsylvanica.......... and O O Ore he eee 
Rides ettobam, 6 ee and O SSandO | SSandO | SandO 
A soe fe! occidentalis. . and O SSandO | SSandO | SandO 
Rosa arkansine: 6002302). 72. and O SSandO | SSandO | SandO 
Eleagnus pisses i pions oka s as and O SSandO | O and O 
Cornus stolonifera............. and O SS andO | O S and O 
Crataegus tomentosa........... dO SandO | O S and O 
LORIE CCRC oo Be Bi es, 
Exotic shrubs 
Syrings vulgatis..:. 30... ... Sand O SSandO | O SS and O 
hae Woy cas wee ae as No starch 
Cee re Os Sand O SS and O py te oe’ 
Acer "Nasunde TE SN S and O Ssand0..| SSand 0. Lyi. 
S,starch; SS, slight starch reaction; O, oils and fats. 
view recently suggested by Sinnott in regard to the relation of 
structure to the nature of food reserve. 
Tests were made of the leaves of the majority of the local 
deciduous trees and shrubs at the time of leaf fall. 
The 
15 species 
examined were characterized by the absence of starch, except in 
