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Apiwim. | XXXV. UMBELLIFERZ. 181 
Fl. summer. The Celery of our gardens is a cultivated variety, in which 
the leafstalk and base of the stem acquire a considerable size. 
2. A. nodiflorum, Reichb. (fig. 405). Procumbent Apiuwm.—Stems 
perennial, creeping and rooting at the base, the annual flowering 
branches ascending or nearly erect; attaining several feet in some 
situations, but usually very much shorter, the whole plant glabrous. 
Leaves with 3 or 10 or more pairs of ovate or lanceolate toothed 
segments. Umbels nearly sessile or on short peduncles, either opposite 
to the leaves or between the upper branches, each with 5 or 6, or rarely 
as many as 8 or as few as 4 rays. General involucre usually 0, but 
sometimes consisting of 3 or 4 narrow-lanceolate bracts; partial invo- 
lucre of several small, lanceolate bracts. 
In marshy meadows and wet ditches, in western and southern 
Hurope ; scarcely eastward of the Rhine, but extends nearly all round 
tne Mediterranean. Abundant in England, Ireland, and southern 
Scotland. fl. summer. It varies much in size and foliage; when very 
luxuriant the leaf-segments are numerous, narrow, from 1 to 14 inches 
long ; in half dried-up open ditches the plant is small, much branched, 
with 3 to 5 small, broad segments; it then also creeps much more, has 
the peduncles rather longer, and has been considered as a distinct species 
(S. repens, Koch.), but both forms may be occasionally found proceeding 
from the same stock. [A. ochneatum, DC., isa dwarf creeping form with 
small obtuse leaflets, and 1 to 3 bracts, found in Surrey. | 
3, A. inundatum, Reichb. (fig. 406), Lesser A.—A glabrous plant, 
creeping and rooting at the base like the last, but much smaller and 
more slender, and often half-immersed in water, when the submerged 
leaves are divided into capillary segments. Flowering stems 6 to 8 
inches high, with small ternate or pinnate leaves; the segments 3- 
toothed or 3-lobed, each lobe again often 3-toothed. Umbels on short 
peduncles opposite the leaves, as in A. nodiflorum, but generally of 2 or 
3 rays only, without involucre; the partial umbels of 5 or 6 small 
flowers, with 2 or 3 minute bracts. 
In swamps, shallow ponds and pools, or half-dried mud, chiefly in 
western and central Hurope, extending northwards into southern Sweden, 
eastwards almost to the Asiatic frontier, but rare in the south. Gene- 
rally dispersed over Britain, but easily overlooked, and consequently 
supposed to be more rare than is the fact. Fl. summer. 
VII. SISON. SISON. 
_ Leaves dissected. Umbels compound, with general and partial 
involucres. Petals broad, deeply notched, with an inflected point. 
Fruit of Apium, except that the axis or carpophore is deeply cleft, as in 
Carum, and the vittas are slightly thickened at the lower end. 
A single species, formerly considered as a congener of Carwm segelum. 
1. S. Amomum, Linn. (fig. 407). Hedge Sison, Bastard Stone Parsley. 
—An erect, glabrous annual or biennial, 2 feet high or rather more, with 
numerous stiff, slender branches in the upper part. Leaves pinnate ; 
the segments of the lower ones ovate or oblong, often an inch long, 
toothed or lobed, or the lower pair again pinnate; the upper leaves 
much smaller, with small, narrow segments, deeply 3-lobed, toothed or 
entire. Umbels on slender peduncles, of 3 to 5 rays, with but few white 
