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Apium prostratum Labill. ex Vent.
Family Apiaceae
Common name: Sea Celery

Apium prostratum Labill. ex Vent. APNI*

Synonyms: Apium australe Thouars APNI*

Description: Biennial or perennial prostrate herb with branches 30–70 cm long, glabrous.

Leaves 1–2-pinnatisect, those near base 5–41 cm long, those opposite compound umbels 2–15 cm long; segments 3-lobed, 2–7 mm wide.

Umbels 3.5–7 cm diam., sessile or peduncle 2–20 mm long; rays 2–15, 0.4–5.5 mm long. Petals ovate, 0.8–1.5 mm long, white.

Fruit obovate to ± circular, 1.3–2.5 mm long and wide; mericarps with 5 thick longitudinal ribs which almost conceal the narrow furrows between them.

Distribution and occurrence: Grows on edges of saltmarsh and coastal cliffs or near rivers or brackish water, west to Denman.
NSW subdivisions: NC, CC, SC, CWS, LHI
Other Australian states: Qld Vic. Tas. S.A. W.A.
AVH map***

There are four subspecies of Apium prostratum. The typical subspecies and Apium prostratum subsp. howense both occur in New South Wales. Only Apium prostratum subsp. howense is described here.

Text by S. M. Hastings & J. M. Powell (1992)
Taxon concept: Short (1979)

Taxa not yet included in identification key
Apium prostratum subsp. howense,    Apium prostratum subsp. prostratum

 Key to the varieties 
1Leaflets entire or divided; undivided leaflets and primary segments of divided leaflets ± linear or narrow-lanceolate, 6–15 times as long as broadvar. prostratum
Leaflets divided, primary segments elliptic, ovate, obovate or ± cuneate, 2–3 times as long as broadvar. filiforme

APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.
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