356 BOTANICAL GAZETTE [May 
QUERCUS VELUTINA. —The last of this series, Q. velutina, has a very 
closely campanulate, thin and delicate perianth. The diameter is the 
; ag same as in Q. coccinea, 3.5-4™". The midrib is entirely 
wanting. The perianth is pilose, and the cilia along the 
margin are long and matted. The throat of the peri- 
anth is so narrow that it is torn by the stamens, as soon 
as they begin to develop, into two or three nearly equal 
segments. In the majority of cases the perianth had sepa- 
rated into two equal segments, but occasionally one was 
found with three, never with more. 
The results of this study show that there is marked 
variation among the flowers, not only in the case of the 
1c.8.—Q., large groups, but also among the species in each, and the 
velutina. following key was based on these characters: 
KEY TO NATIVE OAKS BASED ON THE STAMINATE FLOWERS. 
A. Stamens six to nine. 
I. Bract persistent after anthesis ; ; , ; Q. acuminata 
II. Bract deciduous before anthesis. 
a. Perianth deeply lobed. 
1. Lobes narrowly linear : : : ‘ . Q. macrocarpa 
2. Lobes obovate or spatulate .  Q. prinus 
b. Se ere with shallow lobes. 
. Perianth slightly campanulate : Papp iui 2-3"™" 
2. Perianth rotate: diameter 1-2™ : : 
. alba 
Q. “platanoides 
B. Stamens four or five. 
Q. velutina 
2. coccinea 
6. Perianth smooth eit lobes thinly ciliate Q. rebre 
—W. W. Row Lee and Susie P. NICHOLS, ee University. 
