29. ceratoi'hylle;e. — .30. onagraki.e. 
11.3 
or wliorlcd, fl. in whorlod leafy spike.s, bracts 0, subulate calyx- 
teeth twice as loii" as the others, stain. 12. — E. B. lOtil. — 
Whorls of tl. in a more or less leafy spike, upper 1. usually very 
small, shorter than the flowers ; hut sometimes (j3. verticillatian) 
so large as totally to destroy the spiked appearance and give 
quite a different aspect to the jilant. St. 2 — 4 feet high and 1. 
nearly glabrous, or (y. canescens) downy with crisped hairs. Fl. 
large, purple or crimson. — Ditch-hanks and damp places. P. 
VII. VIII. Purple Loosestrife. 
2. Jj. Hyssopifolia (L.); 1. alternate linear-lanceolate blunt, 
fl. a.xillai-y solitary, bracts 2 minute subulate, calyx-teeth all short, 
stain. (). — E. B. 292. — St. procumbent, spreading, simple or 
branched. F"!. small, light purple. Whole plant glabrous. — Damp 
places where water has stagnated, rare. A. VI. — X. E. I. 
2. Peplis Lin7i. Water PursLaiie. 
1. P. Portiila (L.); 1. opposite obovate stalked, fl. axilLary 
solitary sessile. — E. B. 1211. St. 1. 7- — Pet. often W'anting. St. 
4 — 6 in. long, prostrate, creeping. — Damp places. A. VII. VIII. 
Order XXIX. CERATOPHYLLEiE. 
Fl. monoecious. Perianth single, free, in many divisions. 
Anth. 12 — 20, sessile, 2-celled, 2-j)ointed, “cells again partially 
divided.” — Perigone none. Ovary free, 1 -celled, with 1 jien- 
dulous seed. Embryo straight ; cotyledons 4, alternately smaller. 
1. Ceratophyllum Liim. The only genus. — G. F. G. Mo- 
nochl. 1. 
1. C. demersum {L.) i calyx-segments notched at the end, fruit 
with 2 spines near the base and terminated by the eurved subu- 
late style. — E. B. 947. — L. 2 — 4 times forked ; segments linear- 
filiform, dark green, those of the uppermost 1. broader and more 
rigid. Basal spines sometimes scareely distinguishable. — Ponds 
and ditches. P. VII. 
2. C. submersum (L.); calyx-segments “acute and entire,” 
fr. destitute of s]hnes and terminated by the short curved style. — 
E. B. 679. — Segments of the pale green 1. capillary. — Ponds and 
ihtches, rare. P. VI. E. S. 
Order XXX. ONAGRARI.E. 
Cal. tubular, adnate to the ovary wdiolly or in part, with 2 — 4 
lobes valvate in aestivation. Pet. as many as the ealyx-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 
