CALLITRICHACEA, 121 
little shorter than broad, subcordate, flattish on the faces; marginal 
furrows shallow, increasing in depth regularly from the keels of the 
lobes to the line of separation between them; margins of the lobes with 
short wide keels, the section of which is nearly a right angle. Styles 
very long, at length reflexed and adpressed, deciduous. 
In ditches, ponds, and lakes, more rarely on mud. Not uncommon, 
and generally distributed. 
England, Scotland, Ireland. Perennial. Summer, Autumn. 
A very variable plant, sometimes with the upper leaves obovate or 
oblanceolate, at other times with them all linear and submerged. 
Bracts much incurved, very deciduous. Fruit about 3+; inch long, 
olive. 
Professor Babington suggests that the bracts are perhaps confined 
to the male flowers, but they are so very deciduous that, unless 
observed when the flowers are very young, the plant appears to have 
no bracts at all. 
When submerged the plant is more olive in colour than the pre- 
ceding, and the leaves more translucent; it never has, however, the 
deep green leaves of C. autumnalis, and the fruit is very different. 
I have not seen this subspecies growing out of the water, but Dr. 
Hegelmaier infers that this sometimes takes place, as he states that 
“Jand forms are not abundant.” 
Hooked Water Starwort. 
French, Callitrique en crochet. German, Hakenfirmiger Wasserstern. 
Sun-Srecies (?) IV.—Callitriche pedunculata. D.C. 
Prats MCCLXXIV. 
Hegelm. Monogr. p. 57. 
C. hamulata, 3, Bab. Man. Brit. Bot. ed. vi. p. 304. 
C. autumnalis, Hook. in LZ. B.S. No. 2606 (non Linn.). 
Pollen grains subglobose. Fruit subsessile or more or less con- 
spicuously stalked, as long as or a little shorter than broad, subcordate, 
flattish on the faces; marginal furrows shallow, nearly as deep close 
to the keels of the lobes as in the line of separation between them; 
margins of the lobes with short slender keels, the section of which 
is an acute angle. Styles rather long, at length reflexed and spread- 
ing, caducous. 
In ponds and ditches, but much more frequently on mud or in damp 
places. Common, and generally distributed. 
England, Scotland, Ireland. Perennial. Spring, Autumn. 
C. pedunculata is probably only a variety of C. hamulata, growing 
VOL. VILL. B 
