998 . CALLITRICHACEJE. (WATER-STARWORT FAMILY.): 
1. SAURURUS, L  Lizamp's-Tarir. 
Stamens 4 - 8, with long club-shaped filaments. Fruit somewhat fleshy, com- 
posed of 3-4 partly united 1 -2-seeded carpels, pointed with as many Mei 
— Flowers white. 
1. S. eernuus, L. Stem erect, branching; leaves petioled, cordate-ovate, 
or oblong-ovate, acuminate ; spikes white, terminal, nodding at the apex ; flow- 
ers numerous, each from the axil of a small bract. — Marshes and muddy banks, 
Florida, and northward, May- Aug.— Rhizoma creeping. Stem 19-2? - 
Spikes 4! - 6! long. . 
OrDER 116. CERATOPHYLLACEJE. (Horxwort 
FAMILY.) 
Submerged aquatic herbs, with filiform jointed and branching stems, 
finely dissected whorled leaves, and small axillary monecious flowers, 
destitute of floral envelopes, but surrounded by an involucre of 8-12- 
linear leaves. Anthers 12-24, oblong, 2— 3-toothed, sessile. Ovary 
solitary, simple, with a single suspended orthotropous ovule. Achenium 
compressed, pointed with the slender persistent style. Albumen none. 
Cotyledons 4. Plumule conspicuous. — Consisting of the single genus 
1. CERATOPHYLLUM, L. Horxworr. 
1. C. demersum, L. Leaves rigid, 6 - 9 in a whorl, once or twice forking, 
with the lobes spiny-toothed ; achenium oval, compressed, tubercular-ro 
on the sides, and armed near the base with 2 lateral widely-spreading slender - 
spines. —In still water, Florida, and northward. Sept. and Oct. — Stems 1 pis 
4? long. Leaves near the end of the branches much crowded. , 
2. C. echinatum, Gray? Leaves weak, 9-12 in a whorl, 3-4 time — 
forking, the ultimate segments bristly-toothed ; ovaries warty, unarmed; acht 
nium oblong, tubercular-roughened on the sides, the edges margined and armed 
with 5-7 strong and spreading spines. — Shallow ponds, on St. Vincent's Isl- 
and, West Florida. May.— Stems 6' - 12! long. Hes 
3. C. submersum, L. Leaves hairlike, 3—4 times forking, wis 
toothed ; achenium oblong, slightly compressed, tubercular-roughened, 9! 
Sounded margins, unarmed. = Beth Floride, Dr. Blodgelt. Seas © 
long. ý 
Orven 117. CALLITRICHACE®. (Wares-Sean wow, a 
Fairy.) T i 
Son ee spn ih opin en aen adl aila 
