PODOSTEMACEJA, (RIVER-WEED FAMILY.) 999 
cells confluent. Styles 2, slender: stigmas acute. Capsule 4-angled, 4- 
celled, with a single suspended anatropous seed in each cell, indehiscent. 
Embryo straight, in copious fleshy albumen. Radicle long, superior. — 
Consisting of the single genus 
l. CALLITRICHE, L. Warer-Srarworr. 
1. C. verna, L. Floating leaves spatulate or obovate, crowded, the lower 
ones distant, linear; fruit nearly sessile, 2-bracted, keeled on the back. (C. 
heterophylla, EJ.) — Var. TERRESTRIS. Smaller (2/-3' long); stems much 
branched, creeping on damp earth ; leaves (1” — 2" long) all linear. — Ditches 
and shallow water, Florida, and northward. March and April. — Stems several, 
9'-12'long. Leaves j' long. 
Orver 118. PODOSTEMACELE. (RIVER-WEED FAMILY.) 
Moss-like aquatic plants, with minute flowers, from a spathe-like in- 
voluere, and destitute of floral envelopes.— Stamens 5—12: anthers 
2-celled. Capsule 2 — 3-celled, and pointed by as many persistent styles. 
Seeds numerous, on a thick central placenta, destitute of albumen. — 
Spathe 2-leaved. Flowers pedicelled. Filaments elongated, borne on one 
side of the stalk of the ovary, united below, and bearing only a single anther. 
Styles 2, simple. Capsule ribbed, 2-celled, 2-valved. Seeds imbricated. — 
Submerged aquatic plants, attached to rocks and pebbles by disk-like expan- 
sions of the stem. Leaves 2-ranked, divided into filiform segments. 
1. P. ceratophyllum, Michx. Leaves rigid, sparingly divided, sheath- 
ing at the base ; flowers solitary, on slender pedicels ; capsule oval, 8-ribbed. — 
Rocky places in rivers, Georgia, and northward. July.— Plant olive-green, 
I! - 4! Jong. = : 
2. P. abrotanoides, Nutt. Leaves much divided, with hair-like seg- 
ments; flowers 2-3 together, on short pedicels; capsule oblong, 10-ribbed. — 
Gravelly places in the Chattahoochee River, Nuttall, — Plant larger than the 
Onpzg 119. EUPHORBIACE®. (Spurce FawrLY.) 
Plants commonly with acrid milky juice, and monecious or diccious 
often petalous flowers.—Calyx 2- 8-lobed, mostly valvate in the bud, 
Sometimes wanting. Stigmas 2-several, simple or divided. Fruit of 2— 
veral (mostly 3) 1~2-seeded earpels united around a ventral axis, sep- —— 
tating at maturity, rarely 1-celled or indehiscent. Seeds u 
_ anatropous. Embryo in fleshy albumen. Cotyledons flat. . 
