14 SCHEUCHZERIACEAE. 



summit or in clusters along the upper part. Leaves 

 linear, sheathing. Flowers dioecious in spathes like 

 those of Zostera. Spathes with membranous edges, the 

 back thickened and terminating in long leaf-like ap- 

 pendages. Spadix with a series of short dilated foli- 

 aceous flaps, which close over the flower, spreading open 

 at maturity. Staminate flowers of numerous sessile 

 stamens in 2 rows; anthers 1-celled. Pistillate of simple 

 sessile ovaries, attenuate into a short style; stigmas 2, 

 capillary. Fruit beaked by the short persistent style, 

 cordate-sagittate. 



1. P. torreyi Wats. Stems slender, flat, 0.5 m, long or more, 

 bearing the spathes in clusters along the upper part; leaves 4-8 cm. 

 long, 1-2 mm. wide, thick and smooth; sheaths long, their margins 

 membranous; spathes 3-5 in a cluster, 2-4 cm. long, slightly curved; 

 appendages of the pistillate spadix elliptic, of the staminate oblong- 

 ovate, fruit heart-shaped, 5 mm. long. 



Growing on rocks which are uncovered at low tide. San Pedro; 

 La Jolla. 



Family 7. SCHEUCHZERIACEAE. 



Arrow-grass Family. 



Marsh plants with rush-like or cylindric leaves. 

 Flowers spicate, racemose or solitary, perfect or monoe- 

 cious. Perianth none, 1-bracted or 4-6-parted. Sta- 

 mens 1 or 3-6. Ovaries 1 or 3-6, when more than 1 they 

 are more or less united while immature. Seeds anatro- 

 pous; embryo straight. 



Flowers perfect; perianth segments 3-6. 1. Triglochin. 



Flowers polygamous; perianth wanting. 2. Lilaea. 



1. TRIGLOCHIN L. Arrow-grass. 



Marsh plants with radical semiterete fleshy leaves, 

 which have membranous sheaths at the base. Flowers 

 small, perfect in spikes or racemes, on long smooth naked 

 scapes. Perianth segments 3-6, concave, the 3 inner in- 

 serted higher up than the others when present. Sta- 

 mens 3-6; anthers 2-celled, extrorse, sessile or nearly so, 

 inserted at the base of the segments and deciduous with 

 them. Ovaries 6, united or rarely free, 1-celled; style 

 short; stigmas as many as ovaries, plumose. Fruit of 



