JUNCAGINACE^. 103 



solitary. Perianth i to 6-parted, its segments in two series, sepal-like. 

 Stamens in ours 6 or 1. Ovaries either 3 to 6, or 1, when more 

 than 1 united around a central axis and separating at maturity into 

 1-seeded carpels. Seeds anatropous; embryo straight. 



Flowers perfect, with perianth; stamens 6 1. TbiglochIn. 



Flowers polygamous, the pistillate of 2 kinds; no perianth; stamen 1 .... 



2. LlL£A. 



1. TRIGLOCHIN L. 



Pereanials by means of short rootstocks; leaves fleshy with mem- 

 branous sheaths. Flowers small, in » spike-like, braetless raceme, 

 raised on a scape. Segments of the perianth concave, greenish, 

 deciduous, the three inner inserted higher. Stamens in ours 6; 

 anthers sessile or nearly so. Pistils in ours commonly 6 (rarely 3 to 

 5), their ovaries united around a central axis, splitting when ripe into 

 1-seeded carpels, which separate from the base upward, and leave a 

 slender persistent axis. Stigmas as many as the ovaries, plumose. 

 Carpels dehiscing by the ventral suture. (Greek tri, three, and 

 glochis, a point, referring to the fruit of the 3-carpeled species.) 



Scapes stout; leaves 2 lines wide or more .1. T.nuiritiTna. 



Scapes slender, almost wiry, less than ] line wide .2. T. concinna. 



1. T. maritima L. Common Akkow-gkass. Terminal portion 

 of the rootstock covered with the sheaths of old leaves; scapes stout, 

 1 ft. long or somewhat more, bearing a raceme 10 to 15 in. long, the 

 whole surpassing the (2 to 3 lines wide) leaves; flowers 1 line long, 

 longer than the pedicels, these in fruit conspicuously decurrent; 

 carpels 3-angled, with the dorsal angles winged, making a broad 

 longitudinally-striate groove on the back, 2J lines long, the stigmas 

 persistent and recurved; seed narrowly linear, 1 line long. 



Marshy shores of San Francisco and Suisun Bays. 



2. T. concinna Davy. Slendbr Arrow-gkass. Leaves usually 

 less than 1 line wide; scapes very slender and racemes looser than in 

 the preceding, 7 to 13 in. high; flowers about J line long; carpels 

 rather less than 2 lines long; fruiting pedicels less obviously decur- 

 rent. 



With the preceding. 



2. LIL/EA HBK. 



Aquatic or sub-aquatic herb with fibrous roots and radical grass-like 

 leaves, sheathing at base. Flowers polygamous, in 2 kinds of inflo- 

 rescence, one an axillary inflorescence, consisting of solitary pistillate 

 flowers borne in the axils of the radical leaves, the other a spicate 

 inflorescence, consisting of spikes raised on scapes shorter than the 

 leaves. Axillary inflorescence: — ovary naked, sessile, with elongated 

 filiform style and capitate stigma; fruit flattish, oblong-ovate, coria- 

 ceous, longitudinally ribbed, 1-seeded, indehiscent. Spicate inflo- 

 rescence: — pistillate flowers on the lower part of the spike, perfect 

 at the middle, staminate above; pistillate flowers similar to those 

 in the 'ixils of the radical leaves, but with a. short stj'le and with 



