Bappia. NAIADACEaE. J 93 



4. LILJSA, HBK. 

 Flowers monoecioiis, without perianth. Male floAvers 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 

 in pedunculate exserted spikes, the upper with short styles, but the lower styles 

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

 lanceolate, indehiscent, compressed and ribbed, the upper narrowly winged, the 

 lower wingless and laterally toothed at the summit. Seed with membranous testa 

 and straight narrow and entire embryo. — An aquatic or marsh annual (?) lierb, 

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

 ing species. — Ileterostylus, Hook. 



1. L. subulata, HBK. Leaves | to 1 foot long or more, a line or two broad, 

 several-nervetl, tliin : spikes crowded, a half to an incli long, on peduncles shorter 

 than the leaves : staminate bracts narrowly oblong, obtuse, half a line long, twice 

 longer than the anther : radical fruits 3 lines long, tiie hliform style often 1 to 3 

 inches long ; upper fruits elliptical, acute, somewhat smaller. — ^'^ov. Gen. i. 222, 

 t. 63. Heterostylus gramineiis, Hook. Fl. Bor.-Am. ii. 171, t. 185. 



School Station, near San Francisco {Kellogg) ; in ponds near Searsville, San Mateo County 

 {Bolcmder) ; on the Columbia River, Scoulcr. Apparently not distinct from the Chilian plant on 

 which the species was founded, though usually larger. The Searsville specimens are especially 

 well developed, being 2 feet high or more and the fruiting spikes 1^ inches long. 



5. ZANNICHELLIA, Micheli. Horned Pondweed. 

 Flowers montx?cious, axillary, sessile or nearly so. Male flowers of a single naked 

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

 same axils, of 2 to 5 sessile or shortly stipitate ovaries in a membranou-s cup-shaped 

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

 tropous. Fruit an obliquely oblong coriaceous nutlet, somewhat compressed, beaked. 

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

 bent into a coil. — Very slender immersed branching aquatics, with very narrow 

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

 membranous stipules. Several species are described, perhaps all varieties of a single 

 one. 



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

 leafy : leaves i t(j 2 or 3 inches long : fruit somewhat incurved, often more or less 

 toothed on the back, 1 to 1| lines long, about twice longer than the style, usually 

 becoming sliortly stipitate and frequently also pedunculate. — Z. major, Bonn.; 

 JX'ees, Gen. iii, t. 40 ; lieichenb. Icon. Fl. Germ. vii. 9, t. 16. 



In fresh-water ponds and slow streams ; collected in California by Douglas, in springs at the 

 base of Monte Diablo (Breivcr), in ditches on Oakland Hills {Bolcmder), and near Santa Barbara 

 {Mrs. Elivood Coo2Kr) ; found also in Utah and New Mexico, in the Atlantic States, and in most 

 quarters of the globe, excepting South America and Africa. 



6. RTJPPIA, Linn. Ditch-grass. 

 Flowers perfect, without periantli, 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 



