Ny 
2. Sagittaria L. Arrow-head. 
Perennial marsh herbs with globose rootstocks which in autumn produce 
fpf edible starchy tubers«and fibrous roots, Leaves basal, the earliest, 
commonly floating, Smmemegs linear, the later with strongly sagittate blades 
on long stout petioles. Flowers monoecious or dioecious, 
wheris- of Py d-bracted, on erect scapes, the staminate whorls uppermost. 
Perianth segments 6, the outer 5 herbaceous, persistent, the inner petaloid, 
decidous. Stamens numerous. Tistils numerous, seated on a convex receptacle, 
forming as. many-beakep achenes, a+—~maturity> 
co Bracts orbicular, concave, 5=10 m, long; styles 
’ 4 -8-1.2 um, long; anthers 2 m, longe }. Se latifolia 
_— 
oO Bracts ovate-lanceolate, 8-20 mm, long; styles 
4-8 ma, long; anthers 1.5 mm, long Ry Se cuneata 
1. Se latifolia Willd. ———+» Petioles 350-45 cm. long, the margins 
scarious in the lower parts; leaf-blades extremely variable, strongly 
sagittate, 15-25 cm. long, the reflexed lobes subequal to but shorter than 
the middle lobe which may be 1-10 cm. broad, its margins straight or convex, 
the reflexed lobes simtier~in-each"caso”buP narrower, all acute; flowering 
scape stout, 50-70 cm. tall, the flowers displayed in whorls of 3 in the upper 
half, subtended by broadly ovate or orbicular, concave bracts .5-] cm. long; 
sepals concave, greenish, 5-7 mm. long; petals white, rotund, 1.5-2 cm. long; 
anthers < mm. long; styles .8-l1 mm. long; fruiting heads globose, 1.5-2.5 cm. 
in diameter; achenes thin, obovate, 3 mm lo yacute On the margins, the wing 
subequal in width to the body, taper into an acute beak at right ancles to 
the long axis of the body, .8-1.e2 mm. long. 
In marshes and in shallow water along slowly moving streams, growing 
with S. cuneata, dead. 
