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Australian bornweed, coastal burnweed, tooth coast burnweed

Australian burnweed, cutleaf burnweed

Habit Annuals or perennials, (50–)100–200 cm (sparsely and unevenly tomentose, glabrescent). Annuals or perennials, (20–)100–200 cm (gray- to white-villous or -tomentose, often unevenly glabrescent).
Taproots

with branching lateral roots.

with branching lateral roots.

Stems

1, erect.

1, erect.

Leaves

evenly distributed (proximal often withering before flowering); indistinctly petiolate (bases often weakly clasping);

blades lanceolate to narrowly lanceolate, (3–)7–20 × 1–4 cm, margins sharply and evenly toothed (not lobed or pinnatifid).

evenly distributed (proximal withering before flowering);

petioles weakly defined, ± clasping;

blades lanceolate to narrowly lanceolate or lance-linear, (2–)7–15 × 1–4 cm, margins pinnatifid to pinnately lobed (lobes often sharply dentate) or dentate (distal leaves bractlike).

Involucres

cylindric or turbinate, 4–7 mm.

cylindric or turbinate, 4–7 mm.

Receptacles

3–5 mm diam.

2–5(–6) mm diam.

Phyllaries

usually 8.

usually 13.

Heads

(40–)80–200 in open, corymbiform arrays (or arrays of clusters).

(20–)40–120 in loose, corymbiform arrays (sometimes arrays of clusters).

Cypselae

1.5–2 mm, usually puberulent in lines along relatively narrow ribs, sometimes glabrous.

1.2–1.5 mm, puberulent in lines or grooves between the relatively broad ribs.

2n

= 60.

= 60.

Erechtites minimus

Erechtites glomeratus

Phenology Flowering summer–early fall. Flowering summer–early fall.
Habitat Disturbed, coastal sites Disturbed sites, mostly coastal
Elevation 0–200 m (0–700 ft) 0–300 m (0–1000 ft)
Distribution
from FNA
CA; OR; WA; Pacific Islands (New Zealand); Australia [Introduced in North America]
[WildflowerSearch map]
from FNA
CA; OR; WA; Pacific Islands (New Zealand); Australia [Introduced in North America]
Discussion

The type of Erechtites prenanthoides (A. Richard) de Candolle (a name sometimes misapplied to plants of E. minimus) is conspecific with the type of E. quaridentata (Labillardière) de Candolle.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 604. FNA vol. 20, p. 604.
Parent taxa Asteraceae > tribe Senecioneae > Erechtites Asteraceae > tribe Senecioneae > Erechtites
Sibling taxa
E. glomeratus, E. hieraciifolius
E. hieraciifolius, E. minimus
Synonyms Senecio minimus Senecio glomeratus, E. argutus, Senecio argutus
Name authority (Poiret) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 437. (1838) (Desfontaines ex Poiret) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 297. (1838)
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