oLASS XXI. ORDER 1. ] CALLITRICHE. 1145 
slightly winged at the back. The styles are erect when it is in flower, 
but as the fruit approaches maturity, they become closely reflexed 
over it. ‘The two species frequently grow together in shallow muddy 
water. 
Habitat.—Shallow muddy water; frequent. 
Annual ; flowering during the summer months. 
3. C. peduncula'ta, De Cand. (Fig. 1876.) Pedunculated Water 
Starwort. Leaves all linear, single ribbed, notched at the apex; 
fructiferous peduncles more or less elongated, without bractea at the 
base ; styles long, very fugacious; fruit tetragonal, the angles keeled. 
Hooker, British Flora, ed. 4. vol. i p. 329.—Lindley, Synopsis, p. 
243.—C. autumnalis—-English Botany, Supp. t. 2606. 
Root long, simple slender fibres from the joint of the lower leaves, 
the whole plant submersed. Stem long, slender, filiform, branched. 
Leaves all linear, dark green, single ribbed, sessile, with the apex 
notched or obtuse. Barren and fertile flowers without bractea, or 
very small and fugacious. Stamen with a slender filament and 
roundish two celled anther. Capsules elevated on a distinct pedun- 
cle, sub-globose, four lobed, bluntly keeled at the back. 
Habitat.—Ditch at Amberley, Sussex.—M/r. Borrer. 
Annual ; flowering in suly. 
4, C. autumna'lis, Linn. (Fig. 1377.) Autumnal Water Starwort. 
Leaves all linear, broader at the base, narrow upwards, and notched 
at the apex, sessile, single ribbed; fructiferous peduncle very short, 
without bractea at the base; fruit with its lobes broadly winged at 
the back. 
English Botany, Supp. t 2732.—English Flora, vol. iv. p. 10 — 
Hooker, British Flora, ed. 4, vol.i. p. 329.—Lindley, Synopsis, p. 248. 
Root creeping, and with slender fibrous branches from the joint of 
the lower leaves, the whole plant submersed. Stem long, slender, 
filifurm, branched. Leaves all linear, dark green, single ribbed, pale, 
and somewhat cartilaginous on the margin, sessile, broader at the 
base, gradually narrowing towards the abrupt or notched apex, much 
larger than those of the last species. Barren and fertile flowers 
without bractea. Stamen with a rather long slender filament. 
Anthers two celled. Capsules elevated on a short peduncle, but con- 
cealed by the lobes, which are ovate, with a broad waved dilated keel. 
Habitat.—Ditches near London; Anglesea, Loch of Cluny, Scot- 
land. 
Annual; flowering from June to October. 
Readily distinguished by its long linear leaves broader at the base, 
and especially known by the capsules being much larger than C. 
pedunculata, and the lobes broadly keeled and waved. The thin 
almost transparent leaves of these plants are beautiful examples of 
the cellular structure of leaves, and in thus examining the different 
