Flora of North America species comparison

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Tetrapteron palmeri

Palmer's evening primrose, Palmer's sun cup
Habit Herbs sparsely to moderately strigose and sometimes also sparsely pilose.
Stems

rarely present, swollen, ascending to 2 cm.
Leaves

blade narrowly oblanceolate, 1.5–5.5 × 0.2–0.7 cm, dilated at base, margins sparsely and evenly serrulate.
Flowers

opening near sunrise;

floral tube 0.8–1.3 mm;

sepals 1.6–2.8 mm;

petals 2–5 mm; episepalous filaments 0.8–1 mm, epipetalous filaments 0.2 mm;

sterile projection of ovary 5.5–12 mm;

style 1–2.2 mm, glabrous;

stigma 0.3–0.6 mm diam., surrounded by anthers of long and short stamens.
Capsules

irregularly obovoid, thick-walled, somewhat woody, sharply 4-angled, with pointed wing near center-top of each valve, 5–7 × 4.5–7 mm, tardily dehiscent in distal 1/2 only.
Seeds

brown, narrowly obovoid, 1.2–2 mm.
2n

= 14.

Tetrapteron palmeri
Phenology Flowering Mar–May.
Habitat Desert habitats, on clay or sandy soil, creosote to sagebrush-juniper woodlands.
Elevation 600–1400 m. (2000–4600 ft.)
Distribution
from FNA
AZ; CA; NV; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Tetrapteron palmeri has a disjunct distribution, occurring in four distinct areas: Arizona, represented only by the type specimens collected in the Colorado River valley in 1876; near Harper and Vale, Malheur County, Oregon; north of Winnemucca, Humboldt County, and Empire City, Ormsby County, Nevada; in California it is fairly common from southern Inyo County to the southwestern border of the Mojave Desert, west to the vicinity of Tejon Pass and southeastern San Luis Obispo County in the inner South Coast Ranges, and also east of Jacumba on the road to Mountain Springs in San Diego County.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Tetrapteron
Sibling taxa
T. graciliflorum
Synonyms Oenothera palmeri, Camissonia palmeri, Taraxia palmeri
Name authority (S. Watson) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 214. (2007)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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