101 
CEIt ATOPH YLLEiE — ON AGRARIJE. 
Order XXIX. CERATOPHYLLEiE. 
Fl. moncecious. Perianth single, free, in many divisions. 
Anth. 12 — 20, sessile, 2-celled, 2-pointed, "cells again partially 
divided." — Perigone none. Ovary free, 1 -celled, with 1 pen- 
dulous seed. Embryo straight ; cotyledons 4, alternately smaller. 
1. Ceratophyllum Linn. The only genus. 
1. C. demersum (L.) ; calyx-segments notched at the end, fruit 
with 2 spines near the base and terminated by the curved subu- 
late style. — E. B. 947- — L. 2 — 4 times forked : segments linear 
or setaceous, acute. Basal spines sometimes scarcely distin- 
guishable. — Ponds and ditches. P. VII. 
2. C. submcrsum (L.) ; calyx-segments " acute and entire," 
fr. destitute of spines and terminated by the short curved style. 
— E. B. 679- — Segments of the 1. broader and more rigid. — 
Ponds and ditches, rare. P. IX. ? E. S. 
Order XXX. ONAGRARL/E. 
Cal. tubular, adnate to the ovary wholly or in part, with 
2 — 4 lobes valvate in aestivation. Pet. as many as the calyx- 
lobes, twisted in aestivation, inserted at the top of the tube. 
Stam. 2, 4 or 8, inserted with the petals. Ovary of several cells, 
with a central placenta. Style 1, filiform, stigma capitate or 
lobed. Fr. a berry or capsule with 4 cells. Albumen 0. — 
L. alternate or opposite not dotted. 
1. Epilobium. Cal. 4-cleft. Pet. 4. Stam. 8. Style fili- 
form with a clavate or cruciform stigma. Caps, linear, of 
4 cells, with 4 valves. Seeds numerous, bearded. 
2. Oenothera. Seeds not bearded. In other respects like 
Epilobium. 
3. Isnardia. Limb of the cal. 4-cleft. Pet. 4 or 0. Stam. 4. 
Style filiform, deciduous, stigma capitate. Caps, obovate, 
4-valved,4-celled, many-seeded, with a loculicidal dehiscence. 
4. Circ^ea. Limb of thecal. 2-cleft, its tube closed by a cup- 
shaped disk. Pet. 2, obcordate. Stam. 2, alternate with 
the petals. Style simple ; stigma emarginate. Caps. 2- 
celled, cells 1 -seeded, seeds erect. 
1. Epilobium Linn. 
* Style at length declining, leaves scattered, cal. without any 
separute tube. 
1. E. anyustifolium (L.) ; 1. lanceolate callose-denticulate 
veined, peduncles shorter than the germen, fl. buds obovate nar- 
rowed at the base and suddenly contracted into a point at the 
