OregonFlora: Lasthenia californica vs. Lasthenia ornduffii

	Lasthenia californica	Lasthenia ornduffii
	slender goldfields	large-flowered goldfields, Ornduff's lasthenia
Habit		Plants perennial, often clump-forming, 2.5–30 cm; often rhizomatous.
Stems		glabrous or strigillose.
Leaves		linear to oblong, 5–40 × 0.8–5 mm; margins entire, often coarsely strigose-ciliate proximally; tips acute or obtuse; surfaces glabrous or strigillose.
Involucres		hemispheric, 5–10 mm; surfaces strigillose.
Ray florets		8–16, conspicuous; corollas 5–9 mm, yellow.
Disc florets		10–70+; corollas 1–3 mm, yellow; stamens slightly exserted; styles slightly exserted.
Phyllaries		6–15, not united, elliptic to ovate; tips acute.
Fruits		3–4 mm, gray, glabrous, pappi of 0–4 aristate awns, 1–3 mm.
Heads		radiate; peduncles 0.5–8 cm; surfaces strigillose.
2n		=32.

	Lasthenia californica	Lasthenia ornduffii
Distribution	[WildflowerSearch map] [BONAP county map]	[BONAP county map]
Discussion		Beaches, dunes, bluffs, rocky headlands. Flowering Jun–Aug. 0–200 m. Est. Native. Endemic to Oregon. Lasthenia ornduffii is endemic to Curry County. It differs from its nearest relative, L. californica ssp. macrantha of northwestern California, in its tetraploid chromosome number, the latter taxon being consistently hexaploid. Plants often occur in windswept sites on bluffs and headlands and are dwarfed and compact in their growth. Often many stems arise together from the rhizome, leading to a clumped habit. Taller plants may occur in more protected sites.
Source		Flora of Oregon, volume 2, page 301 Kenton Chambers
Sibling taxa	L. glaberrima, L. maritima, L. ornduffii	L. californica, L. glaberrima, L. maritima
Subordinate taxa	L. californica ssp. californica
Synonyms		Baeria macrantha, Baeria macrantha var. pauciaristata
Web links	Local floras: CA, OR Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: OR 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

Lasthenia ornduffii

slender goldfields

large-flowered goldfields, Ornduff's lasthenia

Habit

Plants perennial, often clump-forming, 2.5–30 cm; often rhizomatous.

Stems

glabrous or strigillose.

Leaves

linear to oblong, 5–40 × 0.8–5 mm;

margins entire, often coarsely strigose-ciliate proximally;

tips acute or obtuse;

surfaces glabrous or strigillose.

Involucres

hemispheric, 5–10 mm;

surfaces strigillose.

Ray florets

8–16, conspicuous;

corollas 5–9 mm, yellow.

Disc florets

10–70+;

corollas 1–3 mm, yellow;

stamens slightly exserted;

styles slightly exserted.

Phyllaries

6–15, not united, elliptic to ovate;

tips acute.

Fruits

3–4 mm, gray, glabrous, pappi of 0–4 aristate awns, 1–3 mm.

Heads

radiate;

peduncles 0.5–8 cm;

surfaces strigillose.

=32.

Lasthenia ornduffii

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Beaches, dunes, bluffs, rocky headlands. Flowering Jun–Aug. 0–200 m. Est. Native. Endemic to Oregon.

Lasthenia ornduffii is endemic to Curry County. It differs from its nearest relative, L. californica ssp. macrantha of northwestern California, in its tetraploid chromosome number, the latter taxon being consistently hexaploid. Plants often occur in windswept sites on bluffs and headlands and are dwarfed and compact in their growth. Often many stems arise together from the rhizome, leading to a clumped habit. Taller plants may occur in more protected sites.

Source

Flora of Oregon, volume 2, page 301
Kenton Chambers

Sibling taxa

L. glaberrima, L. maritima, L. ornduffii

L. californica, L. glaberrima, L. maritima

Subordinate taxa

L. californica ssp. californica

Synonyms

Baeria macrantha, Baeria macrantha var. pauciaristata

Web links