OregonFlora species comparison

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Cotula australis

Australian cotula, Australian waterbuttons
Habit Plants annual, (2)5–20 cm.
Stems

erect or spreading, usually well branched, villous.
Leaves

obovate to spatulate; (0.5)1–4 cm, pinnately lobed or compound;

margins entire or 3–5-lobed;

tips acute;

surfaces glabrous or villous, petiolate.
Peduncles

0.8–7 cm.
Involucres

ovoid or hemispheric, 1.5–3 mm.
Disc florets

corollas 0.75–1 mm, equaling or exceeding involucres, white.
Phyllaries

obtuse, 1-veined;

surfaces glabrous or villous.
Fruits

1–1.2 mm, minutely glandular, brown, winged.
2n

=36, 40.

Cotula australis
Distribution
[WildflowerSearch map]
[BONAP county map]
Discussion

Roadsides, disturbed areas. Flowering Jan–Jul. 0–300 m. Est, WV. CA; widely scattered in North America; Africa, Australia, South America. Exotic.

Cotula australis was found on ballast dumps in Portland as early as 1899, but it has not been reported recently from that area.
Source Flora of Oregon, volume 2, page 234
Kenton Chambers
Sibling taxa
C. coronopifolia, C. mexicana
Web links 
Unless otherwise noted, all data comes from OregonFlora.



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