ADDISONIA 27 
(Plate 54) 
SAGITTARIA LATIFOLIA 
Broad-leaved Arrow-head 
Native of continental North America 
Family ALISMACEAE WATER-PLANTAIN Family 
Sagittaria sagittifolia 1,. Sp. Pl. 993, in part. 1753, 
Sagittaria latifolia Willd. Sp. Pl. 4: 409. 1806. 
Sagittaria variabilis Engelm. in A. Gray, Man. 461. ; 
Sagittaria sagittifolia variabilis Micheli, in DC. Monog. Phan. 3: 69. 1881. 
A perennial marsh or aquatic herb, very variable in size, with 
glabrous foliage. ‘The stems (rootstocks) are underground, with 
more or less elongate branches that often bear tubers. aves 
are erect or nearly so, commonly one to three feet tall; the petioles 
taper gradually upward from the stout partly sheathing bases 
i i i he base of the flowering stem; t 
. The stamens are usu 
numerous, with pale, filiform or subulate, filaments and ovoid or 
ameter or rarely larger. ‘The achenes are about an eighth of an 
inch long; the body is obovate or cuneate, but inequilateral, broadly 
winged, especially at the top; the horizontal beak has a slightly 
declined or curved tip. 
This arrow-head has a very wide geographic distribution, ranging 
from New Brunswick and Nova Scotia to British Columbia, south- 
ward to Florida and California, and through Mexico to Central 
