saururaceje. (lizard’s-tail family. 401 
Order 94. SAURURACEiE. (Lizard’s-tail Family.) 
Herbs, with jointed stems, alternate entire leaves with 
stipules , and perfect flowers in spikes, entirely destitute of 
calyx or any floral envelopes , 3 — 5 more or less united 
ovaries. — Ovules few, orthotropous. Embryo heart-shap¬ 
ed, minute, contained in a little sac at the apex of the albu¬ 
men. 
1* SAURUBIJS, L. Lizard’s-tail. 
Stamens mostly 6 or 7, hypogynous, with long and distinct fila¬ 
ments. Fruit somewhat fleshy, wrinkled, of 3 - 4 pistils united 
at the base, with recurved stigmas. Seeds usually solitary, as¬ 
cending. — A perennial marsh herb, with heart-shaped petioled 
leaves, and white flowers, each from the axil of a small bract, 
closely aggregated in a slender wand-like and naked peduncled 
terminal spike (giving rise to the name, from aavpos, a lizard , 
and ovpa, tail.) 
1- S. ceriums, L. — Margin of ponds, &c., common. June. 
— Spike 3 f - 6 1 long, drooping at the end. 
Order 95.CERATOPHYEE ACEiE. ( Hornwort Fam. ) 
Aquatic herbs , with whorled finely dissected leaves, and 
minute axillary and sessile monoecious flowers without any 
floral envelopes, but with an 8 - 12 -cleft involucre in place 
of a calyx, the fertile a simple 1 -celled ovary, with a sus¬ 
pended orthotropous ovule; the seed filled by a highly de¬ 
veloped embryo with 4 cotyledons ! and a conspicuous plu¬ 
mule. — Consists only of the genus 
1. CEBATOPHYLLUM, L. Hornwort. 
Sterile flowers of 12-24 stamens with large sessile anthers. 
Fruit an achenium, beaked with the slender persistent style. — 
Herbs growing under water, in ponds or slow-flowing streams: 
the sessile leaves cut into 2 - 3-forking thread-like rather rigid di¬ 
visions. (Name from Ktpas , a, horn, and <j>vXKov, leaf) 
1- C, echinatum, A. Gr. Achenium elliptical, rough-point¬ 
ed on the sides, with a terminal and 2 short lateral spines, the slight- 
34* 
