102 Rhodora [JUNE 
showy flowers. Though it can hardly be considered a botanical 
variety, it seems advisable to give it a distinct name. 
RHODODENDRON MINUS f. Harbisonii, forma nova. 
A type differt floribus majoribus, 3.3-4 cm. longis in racemis cir- 
citer 10-floris, sepalis inaequalibus majoribus ovatis longe ciliatis. 
GrorcIa: Banks Co., May 18, 1911, T. G. Harbison (Nos. 615, 
616 in Herb. Arnold Arboretum). 
This differs from the typical form which has the flowers 2.5-3 cm. 
long and the racemes generally 7-8-flowered, in the larger flowers 
and larger racemes; also the leaves are somewhat larger, attaining 
11 em. in length. In its large flowers and denser flower-clusters it 
resembles R. Chapmanii Gray, but that species has smaller obtuse 
or acute, not acuminate leaves very densely lepidote beneath and 
revolute at the margin. 
ARNOLD ARBORETUM. 
THE FORMS OF PELTANDRA VIRGINICA. 
SipxEYX F. BLAKE. 
Plate 94. 
In 1836 Rafinesque, in the New Flora of North America, part 1, 
pp. 85-89, elaborated his previous treatment of the genus Peltandra 
into a monograph in which eight species were described, founded 
principally on differences in leaf outline,! although the number of 
seeds and some supposed diagnostic characters from petiole, scape, 
and spathe were also employed. Of Rafinesque’s species two were 
recently taken up as varieties by Mr. Ivar Tidestrom,? on the basis 
of field study of the plants in Maryland and Virginia. My collection 
last fall of one or two forms obviously distinct from any of these has 
led to a study of Rafinesque’s monograph in connection with the 
material in the Gray Herbarium, the herbaria of the New England 
Botanical Club and the Boston Society of Natural History, and a 
1 Except P. alba Raf. (= P. sagittifolia (Mx.) Raf.), type of the subgenus Leu- 
cospatha Raf. 
2 RHODORA 12:47-50, pl. 83 (March, 1910). 
