104 Rhodora [JUNE 
latifolia with “leaves broad triangular sagittate,....often one foot 
long and broad." Of the two forms with more elliptical leaf outline, 
one, represented by a single sheet from Delaware collected by Com- 
mons, has broad leaves with a rounded tip and broadly rounded ears 
nearly or quite closing the sinus. The other form, which, following 
Tidestrom, is here taken as the type of the species, has a narrower 
more acute leaf with narrower deltoid ears. 
The absence of a distinct geographical range, or even of a difference 
in habitat,! in the case of any of the forms, coupled with the fact that 
the differences are purely foliar and that intergrades are frequent, 
has led me to rank these plants as formae rather than varieties. 
In the following synopsis I have arranged the forms after what 
seem to be their natural affiliations. 
* Leaves broad ( (3)7-17.5 em. wide), with distinct basal lobes 2-13 cm. long. 
+ Leaves with blade? (10)14-22 em. long, 8-17.5 em. wide; basal lobes broad 
(3-7.5 em. wide), short, nearly always less than width of blade, deltoid to 
deltoid-lanceolate, or rounded. 
++ Leaves very broad, almost equilaterally triangular, 18.5-28 cm. across the 
tips of the ears, these obtuse or subacute, } as long as main blade; sinus 
open. 
1. PELTANDRA VIRGINICA (L.) Kunth f. latifolia (Raf.) n. comb. 
P. latifolia Raf. |. c. 87. “South New Jersey and Delaware," Rafi- 
nesque. Specimens examined: Massacuusetts: North Cambridge, 
July 15, 1890 (Sereno Watson). DkLAWwARE: Wilmington, June 2, 
1890 (A. Commons). 
++ ++ Leaves elliptical or elliptical-oblong, not equilateral (11-20 em. between 
tips of the ears). 
= Leaves broad and rounded (blade 16-19.5 em. long, 16.5-17.5 cm. wide); 
basal lobes broadly rounded, scarcely or not projecting at sides of leaf, 
ł as long as the blade; sinus nearly or quite closed. 
2. P. virernica f. rotundata, n. forma? TYPE sHEET (in Gray 
Herb.): DELAwanE: Wilmington, June 2, 1890 (A. Commons). 
= = Leaves more oblong (blade (10)14-22 em. long, 8-17 wide); basal lobes 
obtuse, usually narrowed toward the tip, 1-3 the length of blade, usually 
somewhat diverging; sinus open. 
3. P. virGINIca (typical form). P. undulata Raf., P. canadensis 
Raf., l. e. S7. Typical specimens examined: Marne: Livermore 
1 Mr. Tidestrom found var. angustifolia growing with the type at Nanjemoy Creek, 
Maryland; Dr. B. L. Robinson collected two forms under his number 161 at East 
Jaffrey, New Hampshire; and I found three forms growing in a Sphagnum bog in 
Canton, two about a pond in West Stoughton, and two in a ditch in woods in Norwood, 
Massachusetts. 
2 Blade is measured from top of petiole to tip of leaf. 
3 P. virainica f. rotundata, n. forma, foliis rotundatis, lamina (vide supra) 16-19.5 
em, longa, 16.5-17.5 cm. lata; lobis basilariis late rotundatis, vix aut omnino non 
divergentibus, dimidio longis lamina; sinu prope vel ex toto clauso. 
