CLASS v. ORDER II.] HOLOSCIADIDM. 359 



leaves, tripinnate, with linear segments; umbels numerous, simple, 

 and compound ; involucre of a single segment, or wanting. 



Hooker, British Flora, vol. i. p. 128. Lindley, Synopsis, p. 123. 

 Pimpinella dioica, Linn. English Botany, t. 1209. English Flora, 

 vol. ii. p. 90. 



Root tapering, fleshy. The whole plant smooth, or nearly so, of a 

 pale glaucous green. Barren plants smaller and less spreading than 

 the fertile ones. Stem erect, angular, furrowed, frequently purplish, 

 branched from the base, and leafy, branches alternate, sometimes op- 

 posite above. Leaves numerous, on channeled footstalks, dilated at 

 the base, and partly embracing the stem, tripinnate, leaflets linear, 

 lanceolate, simple, entire, the terminal ones mostly united in threes. 

 Umbels mostly numerous, simple, and compound, the general of about 

 eight slender channeled rays, mostly of unequal lengths, partial of 

 from four to ten irregular short pedicles. Flowers white or pinkish. 

 Calyx limb an obsolete margin, barren flowers without. Involucre 

 both general and partial mostly absent, or only of one segment, germen 

 and infertile bearing imperfect anthers. Styles spreading. Stigmas 

 almost globular. Fruit ovate, slightly compressed on the sides. 



Habitat. Dry barren places in limestone districts ; rare. On St. 

 Vincent's rock, near Bristol ; at Uphill, Somersetshire ; Whorlhill, 

 Somerset ; said to have been found by Dr. Wade, at Athboy, Ireland. 



Perennial; flowering in May and June. 



GENUS LITI. HOLOSCIA'DIUM. KOCH. Marsh-wort. 



GEN. CHAR. Calyx limb of five teeth, or obsolete. Petals ovate, 

 entire, with a straight or indexed point. Fruit ovate or oblong., 

 laterally compressed. Carpels with five filiform prominent equal 

 ridges, the lateral ones forming the margins. Channels with 

 single vittce. Albumen convex at the back, plain in front. In- 

 volucre various. Name from EXo?, a marsh ; and c-xta&ov, 

 an umbel. 



I. H. nodi'Jlorum, Koch. (Fig. 423.) procumbent -Marsh-wort. 

 Stem procumbent, and rooting at the base; leaves pinnate; leaflets 

 sessile, ovate-lanceolate, obtusely serrated ; umbels opposite the leaves, 

 sessile, or on short peduncles. 



Hooker, British Flora, vol. i. p. 128. Lindley, Synopsis, p. 122. 

 Sium nodiflorum, Linn. English Botany, t. 639. English Flora, 

 vol. ii. p. 57. 



Stem long, procumbent at the base, putting out at the joints tufts of 

 long slender branched fibrous roots, the stem is erect above, round, 

 smooth, finely striated, branched and leafy. Leaves alternate, pinnated, 



