1918] LANGDON—RAY SYSTEM OF QUERCUS 323 
- 
4s 
a 
i 
= 
oo 
LITERATURE CITED 
- Battey, I. W., Reversionary characters of traumatic oak wood. Bor. 
GAZ. 50:374-380. 1910 
, The relation of the leaf trace to the i eaae = compound rays in 
the hove er dicotyledons. Ann. Botany 25:225-241. 
, The evolutionary history of the foliar ray in re seed of the dicots, 
_and its phylogenetic significance. Ann. Botany 26:647-661. 1912 
Bartey, I. W., and Srynort, E. W., Phylogeny of the aiisicepectis: Bor. 
GAZ. §8:36-58. 1914 
Eames, A. J., On the origi of the broad ray in Quercus. Bor. GAz. 49:161- 
166. 1910. 
, On the origin of the herbaceous habit in angiosperms. Ann. 
Botany 25:215~224. 1o11. 
JEFFREY, E. C., The progress of plant anatomy during the last decade. 
Amer. Nat. 43: 230-237. 
Igo09. 
, THOMPSON, W. P., On the origin of the multiseriate ray of the dicotyledons. 
Ann. Botany 25:1005-1014. IgII 
