76 JUNG AGIN ACEAE 



Leaves very minutely serrulate; flowers monoecious; stems unarmed. 



Nutlet shining, smooth; sheathing base of leaves with many minute teeth on its upper 



portion 2. N. ftexilis. 



Nutlet dull, reticulated; sheathing base of leaves commonly narrow and with "few teeth or 



sometimes entire 3. N. giiadalupensis. 



1. N. marina L. HOLLY-LEAVED NAIAD. Stems stout, often armed with 

 prickles twice as long as their breadth ; leaves linear, % to l 1 /^ inches long, 1 to 

 iy> lines broad, coarsely saw-toothed, with the teeth spinulose-tipped and the 

 broad sheathing base entire or with 1 or 2 teeth on each side ; nutlet 2 to 2 l / 2 

 lines long, reticulated. 



Clear Lake to Lower California, east to the Atlantic States. Rare in North 

 America. Europe, Asia, Australia. Var. CALIFORNICA Rendle. Internodes 

 sparingly spinose ; leaves very coarsely toothed and with 4 to 6 dorsal spines. 

 Described from specimens collected by Coulter and Orcutt, therefore evidently 

 southern California. 



Refs. NAIAS MARINA L. Sp. PL 1015 (1753); Morong, Mem. Torr. Club, 3 2 : 58, pi. 65 

 (1893); Jepson, Fl. W. Mid. Cal. 102 (1901). Var. CALIFORNICA Eendle, Trans. Linn. 2d ser. 

 5: 398, t. 39, fig. 15 (1899). N. major Allioni, PL Pedem. 2: 221 (1785); Wats. Bot. Cal. 

 2: 191 (1880). 



2. N. flexilis R. & S. SLENDER NAIAD. Stems slender; leaves narrowly 

 linear, very minutely toothed, mostly acuminate, y 2 to 1 inch long, 14 t l /2 li ne 

 wide; nutlet oblong-ovoid, 1 to 2 lines long, nearly smooth, shining. 



Southern California (Soldiers' Home, ace. Davidson) to San Francisco, 

 north to Washington and east to the Atlantic. Europe. 



Eefs. NAIAS FLEXILIS E. & S. Fl. Sedin. 382 (1824); Wats. Bot. Cal. 2: 191 (1880); 

 Morong, Mem. Torr. Club, 3 2 : 59, pi. 66 (1893) ; Jepson, Fl. W. Mid. Cal. 102 (1901). 



3. N. guadalupensis Morong. Stems thread-like, 1 to 2 feet long; leaves 

 6 to 9 lines long, 1/2 line wide or something less, abruptly acute ; nutlet cylin- 

 drical, 1 to l 1 /^ lines long, dull but distinctly marked with numerous rows of 

 squarish reticulations. 



Oregon to San Francisco and southeastward to the Atlantic. Tropical 

 America. 



Eefs. NAIAS GUADALUPENSIS Morong, Mem. Torr. Club, 3 2 : 60, pi. 67 (1893). Caulinia 

 guadalupensis Spreng. Syst. 1: 20 (1825), type loc. Guadalupe Island. 



JUNG AGIN ACEAE. ARROW-GRASS FAMILY. 



Marsh or sub-aquatic herbs with basal rush-like or grass-like leaves, and 

 small flowers in racemes or spikes, or solitary. Perianth regular, 3 or (in ours) 

 6-parted, the 3 outer segments (sepals) resembling the 3 inner (petals), or 

 perianth none. Stamens in ours 6 or 1. Ovaries 1, or 3 to 6 and united. 

 Embryo straight. Temperate zones, 5 genera. 



Bibliog. Buchenau, Fr., Scheuchzeriaceae (Engler, Pflzr. teil 4, abt. 14, 1903). Campbell, 

 D. H., Development of the Flower and Embryo in Lilaea subulata (Ann. Bot. vol. 12, pp. 1-28, 

 pis. 1-3, 1898). 



Flowers perfect, in a raceme; perianth 6-parted; stamens 6. 



Leaves all basal; flowers greenish, numerous in bractless spike-like racemes. .1. TRIGLOCHIN. 

 Leaves both basal and cauline; flowers white, few in a loose bracted raceme 



2. SCHEUCHZERIA. 



Flowers polygamous, in a spike, also with some solitary; perianth none; stamen 1. .3. LILAEA. 



1. TRIGLOCHIN L. 



Perennial by means of short rootstocks. Leaves fleshy with membranous 

 sheaths. Flowers small, in a spike-like bractless raceme raised on a scape. 

 Perianth 6-parted, deciduous, the three inner segments inserted higher. Sta- 

 mens in ours 6 ; anthers sessile or nearly so. Pistils in ours commonly 6 (rarely 



