^•'VV""- NAIADACJ'L'E. mo 



I'Jo 



4. LILJEA, 1II5K. 

 Flowers moua^cious, M-itl,out perianth. Male llowors mingled with the pistillate 

 or in distinct spikes, of a single nearly sessile 2-celled rounded anther subtended by 

 a hyaline bract. Ovaries naked, sessile and erect, in the axils of radical leaves and 

 ni pedunculate exserte.l spikes, the upper with short styles, but the lower styles 

 much elongated ; stigmas capitate ; ovules solitary, erect. Fruit coriaceous, oblon- 

 lanccolate, mdehiscont, compressc.l and riblmd, the upp.>r iiarn.wly win-'cd tlm 

 lower wingless and laterally toothed at the summit. .Seed with membrano°us 'testa 

 and straight mirrow and entire embryo. — An aquatic or marsh annual (?) herb 

 with fibrous roots and radical grass-like leaves sheathing at base. Only the follow- 

 ing species. — Heterostylns, Hook. 



1. Ii. subulata, HBK. Leaves i to 1 foot long or more, a line or two broad 

 •several-nerved, thin : spikes crowded, a half to an inch long,' on peduncles shorter 

 than the leaves : staminate bracts narrowly oblong, obtuse, half a line lon<r twice 

 l.»nger than the anther: radical fruits 3 lines long, the filiform style often 1 to 3 

 inches long; upper fruits elliptical, acute, somewhat smaller. — 2s' o v. Gen i 2n 

 t. 03. Jleterosti/lus gmmineus, Jlook. Fl. JJor.-Am. ii. 171, t. 185. 



fi;S?oO^-l>''ti;n'r''; ^T- ^.'■""''•-;? (y^^/'W/); iu po.uls near Searsville, San Mateo County 

 K I •^ ' ■ <^° !""'"/' }^'\^''^ ''x^^^"^"-- Ai.i.a.ently not distinct fron. ti.e Cliifian plant on 

 wel^ ev o^Jd'Tern'o'T'l'^ usually la,^..,-. The Sea.svillc specin>ens are eipe blly 



Men ueveloped, being 2 feet high or more and the fruiting spikes I^ inches long. 



5. ZANNICHELLIA, Aficheli. IIuiinei. Pondweed. 

 Flowers mona-cious, axillary, sessile or nearly so. Male flowers of a sin-le naked 

 stamen, with elongated filament and 2-celled anther. Fertile flowers usuaHy in the 

 same axils, of 2 to o.sessile or shortly stipitate ovaries in a membranous cup-shaped 

 perianth or spathe ; style short; .stigma peltate; ovule solitary, suspended, ortho- 

 trop(,u.s. 1 nut an obli.piely oblong coriaceous nutlet, somewhat compressed, beaked 

 Seed with membranous testa. Embryo slender, the attenuate cotyledonary end 

 b.-nt into a coil. — Very slender immersed branching aquatics, witli very narrow 

 ami filiform flattened mostly opposite leaves, not sheathing, and with small free 

 membranous stipules. Several species are described, perhaps all varieties of a siu'de 

 one. " 



1. Z palustris, Linn. Stems 2 inches to 2 feet long or more, branching and 

 ea y : feaves ^ to 2 or 3 inches long : fruit somewhat incurved, often more or less 

 toothed on the back, 1 to 11 lines long, about twice longer than the stvlc, usually 

 becoming shortly stipitate and frequently also j)edunculate. — Z. major Lonu • 

 iNees, (Jen. in, t. 4G ; IJeichenb. Icon. Fl. (Jerm. vii. 9, t. 10. 



In fresh-water pomls and slow streams ; collected in California bv D,mr,In,, i„ stuinrrs nt th.- 

 aTrflV,r1r'"''^'l ^f"'W' -^"'V:"'^"-: °" O-^'^''-^"'' "''"^^ (B"hnrfr.r), nnd near 4nta B ha a 

 quaiters of the globe, e.\cepting South America and Africa. 



6. RUPPIA, bin... Diirii-oKAss. 

 Flowers perfect, without perianth, 2 or more approximate on a spadix enclosed 

 in the sheathing base of a leaf, becoming long-exserted. Anthers 2, sessile, of 2 dis- 

 tinct cells, transversely dehiscent. Ovaries 4, at first sessile, with nearly sessile 

 depressed stigmas, and .solitary suspended campylotropous ovules. Fruit obliquely 



