Helosciadium nodiflorum (L.) W.D.J.Koch / Homotypic Synonyms: Apium nodiflorum (L.) Lag., it is a perennial, ascending or procumbent-creeping, glabrous herb, with up to 1 m tall, upright flowering shoots, and fusiform roots, stem sulcate, hollow, rooting at the basal nodes. Leaves oblong, 2-20 x 1-8 cm, imparipinnately 1-pinnate; petiole up to 15 cm long, broadened at the base to a membranous margined sheath, canaliculate on upper side; leaflets sessile, glabrous lateral ones opposite, lanceolate to narrowly ovate, 1-6 x 0.5-3 cm, oblique at the base, serrate, acute or sub obtuse. terminal leaflet usually 3-lobed. Umbels 3-12-rayed, leaf-opposed, sessile or on up to 2 cm long peduncles; rays c. 0.5-2.5 cm long, unequal, patent or recurved, glabrous. Bracts usually absent, rarely 1-2. subulate, acute. Umbellules 1O-12-flowered. Pedicels 1-2 mm long, unequal. Bracteoles 5-7, oblong-lanceolate, 2.5-5 mm long, membranous margined, acute. Petals white, suborbicular to broadly ovate, c. 0.5-0.7 mm in diam. Anthers ovoid, purplish. Styles longer than stylopodium, reflexed in fruit. Fruit ovoid-oblong, 2-2.5 x 1-1.5 mm, dark brown; meriearps with 5 prominent, pallid. thick ribs.
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