Ae FOUNDATIONS OF BOTANY 
1. S. variabilis, var. latifolia, Willd. Broap-LEAVED ARROw- 
HEAD. Leaves very variable in size and shape, from broadly 
sagittate to linear; those growing on the drier soil being usually the 
broader; petioles 6-30 in. long. Scape smooth or slightly downy, 
6-86 in. high; bracts acute. Flowers moncecious or sometimes 
dicecious, white, 1 in. or more in width; pedicels of the staminate _ 
flowers twice the length of those of the fertile flowers. Filaments 
long, smooth, and slender. Akenes with beak nearly horizontal. 
Ditches and muddy places.* 
2. S. graminea, Michx. GRASS-LEAVED SAGITTARIA. Leaves 
long-petioled, lanceolate, or elliptical, and acute at each end, 3-5- 
nerved, or often linear, the earlier 
often reduced to flattened petioles. 
Scape slender, usually longer than 
the leaves, simple, weak, often pros- 
trate in fruit; bracts small, ovate, 
connate at the base. Flowers monce- 
cious or dicecious, on long, thread- 
like pedicels, about } in. wide. 
Stamens 10-20, filaments downy. 
Akenes nearly beakless. In ditches 
and shallow pools.* 
N\ 
Fig. 2.— Diagram of Inflorescence 
of a Grass. Fic. 3.— Fescue-grass (Festuca 
pratensis). 
g, sterile glumes ; P,, a flowering glume; A, spikelet (compare Fig: 2); B, a 
P,, a scaly bract (palea); e, transparent ogee! the lodicules in front and 
scales (lodicules) at the base of the the palea behind; C, a lodicule; 
flower; B, the flower. D, ovary. 
