OregonFlora: Hieracium longipilum vs. Hieracium greenei

	Hieracium longipilum	Hieracium greenei
		Greene's hawkweed
Habit		Plants 10–60 cm; taprooted.
Stems		erect; simple or branched, tomentulose, sometimes pilose near base.
Leaves		basal and sometimes 1 cauline, oblanceolate, 3–15 cm; margins mostly entire; some usually blunt-toothed; tips usually acute; surfaces densely pilose-hispid; petioles sometimes winged.
Inflorescences		panicle-like arrays, bracteate.
Involucres		cylindric in flower and fruit, 9–12 mm.
Florets		5–10+; ligules 8–10 mm, yellow.
Phyllaries		linear-lanceolate; surfaces lightly to moderately tomentulose; inner 6–10; outer gradually shorter.
Fruits		columnar, 3–3.5 mm, dark brown.
2n		=18.

	Hieracium longipilum	Hieracium greenei
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion		Rocky slopes and outcrops, roadcuts, forest openings. Flowering Jun–Aug. 600–2500 m. Casc, ECas, Sisk. CA. Native. Occasional specimens are suggestive of hybridization with Hieracium bolanderi. The molecular phylogenetic studies by Gaskin and Wilson (2007) placed H. greenei as the sister taxon to H. parryi.
Source		Flora of Oregon, volume 2, page 289 Kenton Chambers
Sibling taxa	H. albiflorum, H. aurantiacum, 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. horridum, H. lachenalii, H. longiberbe, H. murorum, H. parryi, H. pilosella, H. piloselloides, H. sabaudum, H. scouleri, H. triste, H. umbellatum
Web links	Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Hieracium longipilum

Hieracium greenei

Greene's hawkweed

Habit

Plants 10–60 cm; taprooted.

Stems

erect; simple or branched, tomentulose, sometimes pilose near base.

Leaves

basal and sometimes 1 cauline, oblanceolate, 3–15 cm;

margins mostly entire; some usually blunt-toothed;

tips usually acute;

surfaces densely pilose-hispid;

petioles sometimes winged.

Inflorescences

panicle-like arrays, bracteate.

Involucres

cylindric in flower and fruit, 9–12 mm.

Florets

5–10+;

ligules 8–10 mm, yellow.

Phyllaries

linear-lanceolate;

surfaces lightly to moderately tomentulose; inner 6–10; outer gradually shorter.

Fruits

columnar, 3–3.5 mm, dark brown.

=18.

Hieracium longipilum

Hieracium greenei

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Rocky slopes and outcrops, roadcuts, forest openings. Flowering Jun–Aug. 600–2500 m. Casc, ECas, Sisk. CA. Native.

Occasional specimens are suggestive of hybridization with Hieracium bolanderi. The molecular phylogenetic studies by Gaskin and Wilson (2007) placed H. greenei as the sister taxon to H. parryi.

Source

Flora of Oregon, volume 2, page 289
Kenton Chambers

Sibling taxa