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devil's paintbrush, king-devil, orange hawkweed

Lachenal's hawkweed

Habit Plants 15–60 cm; taprooted, stoloniferous. Plants 30–70 cm; taprooted.
Stems

erect; simple, pilose-hispid, usually also stipitate-glandular, tomentulose distally.

simple or branched, usually tomentulose or spiculate-glandular.

Leaves

basal, sometimes 1 near stem base, oblanceolate, 5–20 cm;

margins entire;

tips acute or obtuse;

surfaces pilose-setose;

petioles short, winged.

basal and cauline, or sometimes cauline, broadly elliptic, 5–10 cm, bases tapered;

margins dentate; lower strongly toothed;

surfaces glabrous or lightly pilose;

basal petiolate;

cauline petiolate or sessile.

Inflorescences

raceme- or panicle-like arrays, bracteate or not.

panicle- or raceme-like arrays, bracteate or not.

Involucres

campanulate in flower; ovoid in fruit, 6–8 mm.

campanulate in flower; ovoid in fruit, 7–10 mm.

Florets

25–100+;

ligules 10–15 mm; reddish orange, drying purplish.

40–80+;

ligules 13–18 mm, yellow.

Phyllaries

linear-lanceolate;

surfaces blackish stipitate-glandular, usually setose-hispid; inner 13–30; outer > inner.

linear-lanceolate;

surfaces black stipitate-glandular, sometimes tomentulose; inner 14–20+; outer gradually shorter.

Fruits

columnar, 1.2–2 mm, dark brown.

columnar, 2.5–3 mm; black.

2n

=18, 27, 36, 45, 54, 63, 72.

=27.

Hieracium aurantiacum

Hieracium lachenalii

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

Disturbed areas, roadsides, clearcuts, riverbanks, pastures. Flowering Jun–Aug. 100–1400 m. BW, Casc, CR, ECas. CA, ID, NV, WA; scattered in North America; Europe. Exotic.

Hieracium aurantiacum is a conspicuous and well-known weed over much of the United States and southern Canada. Its scattered distribution in Oregon indicates an ability to disperse by seed, and once established it may persist and spread by both seeds and stolons.

Disturbed areas, roadsides. Flowering Jun–Aug. 0–1400 m. Casc, WV. WA; sparsely scattered in North America; Europe. Exotic.

Plants of H. lachenalii produce abundant fruits, probably by apomixis since its chromosome number is triploid.

Source Flora of Oregon, volume 2, page 288
Kenton Chambers
Flora of Oregon, volume 2, page 289
Kenton Chambers
Sibling taxa
H. albiflorum, H. bolanderi, H. caespitosum, H. greenei, H. horridum, H. lachenalii, H. longiberbe, H. murorum, H. parryi, H. pilosella, H. piloselloides, H. sabaudum, H. scouleri, H. triste, H. umbellatum
H. albiflorum, H. aurantiacum, H. bolanderi, H. caespitosum, H. greenei, H. horridum, H. longiberbe, H. murorum, H. parryi, H. pilosella, H. piloselloides, H. sabaudum, H. scouleri, H. triste, H. umbellatum
Synonyms Hieracium vulgatum
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