Citation: Sprague, J. Bot., Lond. 61:131 (1923).

Synonymy: Sison ammi sensu Jacq., Hort. Bot. Vindob. 2:t. 200 (1773), non L.; Pimpinella leptophylla Pets., Syn. 1:324 (1805); Apium leptophyllum (Pers.)F. Muell., Fragm. Phyt. Aust. 4:184 (1864); A. ammi Urban in C. Martius, Fl. Bras. 11, 1:341 (1879), nom. illegit., non (L.)Crantz (1767); A. tenuifolium Thell. in Hegi, Ill. Fl. Mitt.-Eur. 5, 2:1140 (1926).

Common name: Slender celery.

Description:
Slender glabrous annual, 30-70 cm high; leaves oblongovate in outline, 2.5-4 (rarely to 10)cm long, 3 or 4 times pinnately or ternately dissected, divided into numerous almost filiform segments 0.5-1 mm broad; lower leaves petiolate, upper sessile.

Umbels compound, mostly sessile or short-pedunculate, with 2-5 slender rays; involucre and involucel absent; umbellules many-flowered; pedicels slender, 2-8 mm long; calyx inconspicuous.

Fruit ovoid, 1.2-3 mm long, 1.5-2 mm broad, glabrous; carpophore shortly bifid; vittae minute.

Published illustration: Burbidge & Gray (1970) Flora of the A.C.T., fig. 283; Beadle (1980) Students flora of north-eastern New South Wales, fig. 267 B1, B2; Cunningham et al. (1982) Plants of western New South Wales, p. 540.

Distribution:  A garden and roadside weed, on waste places.   W.Aust.; N.T.; Qld; N.S.W.; Vic.   A native of America; widespread in the tropics of both hemispheres. Conservation status: naturalised Flowering time: Oct. — March.

SA Distribution Map based on current data relating to specimens held in the State Herbarium of South Australia

Biology: No text

Author: Not yet available