76 JUNCAGIN.VCEAE 



Leaves very minutely serrulate; flowers monoecious; stems unarmnl. 



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. guadalupensis. 



1. N. marina L. Holly-leaved Nalvd. Stems stout, often armed with 

 prickles twire as long as their breadth ; leaves linear. % to l^A inches long, 1 to 

 11/. 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 21^ 

 lines long, reticulated. 



Clear Lake to Lower California, east to the xVtlantic States. Kare 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.— N.ii.^s M.\RIX.\ L, Sp. PI. 1015 (17.53); Morong. Mem. Torr. Club, 3=: 58, pi. 65 

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

 5: 398, t. 39, fig. 15 (1S99). .V. major Allioni, Fl. Pedem, 2: 221 (1785); Wats. Bot. CaL 

 2: 191 (1880). 



2. N flexilis R. & S. Slender Nalvd. Stems slender; leaves narrowly 

 linear, very minutely toothed, mostly acuminate, % to 1 inch long, 14 to Vi I'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 FI.EXILIS R. & S. Fl. Sedin. 382 (1824); Wats. Bot. Cal. 2: 191 (1880); 

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



3. N. guadalupensis ]\Iorong. Stems thread-like. 1 to 2 feet long; leaves 

 6 to 9 lines long. '- line wide or something less, abruptly acute; nutlet cylin- 

 drical, 1 to IVi; lines long, dull but distinctly marked with numerous rows of 

 squarish reticulations. 



Oregon to San Francisco and southeastward to the Atlantic. Tropical 

 America. 



Refs. — Naias guadalupensis Morong, Mem. Torr. Club, 3-: fiO, pi. 67 (1893). Caulinia 

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



JUNCAGINACEAE. 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 (.A.nn. 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 eauline; 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 



