100 ENGLISH BOTANY. 



GENUS r//.— HELOSCIADIUM. Koch, 



Calyx-limb obsolete, or of 5 small teeth. Petals oval or ovate, 

 not notched, with the point erect or slightly incurved. Cremocarp 

 oval-ovoid or oblong-ovoid, laterally compressed ; columella entire, 

 free ; mercicarps with 5 filiform prominent equal ridges ; inter- 

 stices eacli Avith a single vitta. Involucre none, or of few leaves ; 

 involucel of numerous leaves, or of few leaves all on one side. 



Herhs with pinnate leaves and white flowers in few-flowered 

 irregular umbels. 



This genus of plants is named from two Greek words IXoq (heJos), a marsh, and 

 (TKiacioy (skiadion), an umbel, meaning an umbelliferous plant inhabiting marshes. 



SPECIES I— HELOSCIADIUM NODIFLORUM. Koch. 



Plates DLXXIII. DLXXIV. 



Jieich. Tc. Fl. Germ, et Ilelv. Vol. XXI. Tab. GG. 



milot, Fl. Gall, et Germ. Exsicc. No. 2849. 



Apium nodiflorum, Reich.Jil, Ic. Fl. Germ, et Helv. Vol. XXI. p. 10. 



Stem decuml>ent or prostrate, rooting at the lower or at all the 

 nodes. Leaves pinnate (rarely ternate), with 2 to G pair of pinnse; 

 leaflets sessile, elliptical-lanceolate, oval or ovate, rounded at the 

 base, undivided or slightly lobed, serrate. Umbels opposite the 

 leaves, subsessile or shortly stalked ; rays 4 to 10, unequal. Invo- 

 lucre usually of few leaves ; involucel of numerous leaves, scarious 

 at the margins. Cremocarp longer than broad. 



Var. a, vulgare. Schultz. 

 Plate DLXXIII. 



Slum nodiflorum, Linn. Sm. Eng. Bot. No. 639. 



Stems decumbent, the flowering portion rooting only at the 

 base. Leaflets elliptical-lanceolate or ovate-lanceolate. Umbels 

 very shortly stalked, without an involucre, or one of 1 or 2 leaves. 



Var. 3, repens. 



Plate DLXXIV. 



II. repens, Koch, Syn. Fl. Germ, et Helv. ed. ii. p. 312. Gr. & Godr. Fl. de Fr. Vol. I. 



p. 756. 

 H. nodiflorum, var. y, longepednnculatura, and H. repens, F. Schultz, Arch, de Fl. p. 137. 

 Apium repens, Iteich.fd, Ic. Fl. Germ, et Helv. Vol. XXI, \\ 10. 

 Sium repens, Sm. Eng. Bot. No. 1431. 



Stems prostrate, the flowering as well as the barren branches 

 creeping. Leaflets ovate or ovate-lanceolate. Umbels on stalks 



