Erechtites minimus |
Erechtites hieraciifolius |
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Australian bornweed, coastal burnweed, tooth coast burnweed |
American burnweed, fireweed, pilewort |
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Habit | Annuals or perennials, (50–)100–200 cm (sparsely and unevenly tomentose, glabrescent). | Annuals, (50–)100–200 cm (glabrous or unevenly coarse-tomentose, sometimes ± succulent). | ||||
Taproots | with branching lateral roots. |
with tufts of fibrous roots. |
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Stems | 1, erect. |
1(–2+), erect. |
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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 often withering before flowering); indistinctly petiolate or subsessile; blades ovate-lanceolate to lanceolate, (3–)6–20 × (1–)2–8 cm, margins subentire to serrate or weakly lobed (distal leaves clasping, bractlike). |
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Involucres | cylindric or turbinate, 4–7 mm. |
urceolate or obconic, 10–17 mm. |
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Receptacles | 3–5 mm diam. |
(disclike, conspicuously expanded when fresh) 5–12 mm diam. |
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Phyllaries | usually 8. |
usually 21. |
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Heads | (40–)80–200 in open, corymbiform arrays (or arrays of clusters). |
2–20(–40) in ± corymbiform arrays. |
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Cypselae | 1.5–2 mm, usually puberulent in lines along relatively narrow ribs, sometimes glabrous. |
2.3–3 or 4–5 mm, nerves 10–12 or 16–20, faces puberulent between nerves or glabrous. |
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2n | = 60. |
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Erechtites minimus |
Erechtites hieraciifolius |
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Phenology | Flowering summer–early fall. | |||||
Habitat | Disturbed, coastal sites | |||||
Elevation | 0–200 m (0–700 ft) | |||||
Distribution |
CA; OR; WA; Pacific Islands (New Zealand); Australia [Introduced in North America]
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AR; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VT; WA; WI; WV; NB; NS; ON; PE; South America; West Indies; Pacific Islands (New Zealand); Australia
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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.) |
Varieties 3 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 20, p. 604. | FNA vol. 20, p. 603. | ||||
Parent taxa | Asteraceae > tribe Senecioneae > Erechtites | Asteraceae > tribe Senecioneae > Erechtites | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Senecio minimus | Senecio hieraciifolius | ||||
Name authority | (Poiret) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 437. (1838) | (Linnaeus) Rafinesque ex de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 6: 294. (1838) | ||||
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