Flora of North America species comparison

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Neoholmgrenia hilgardii

Hilgard's evening primrose, Hilgard's suncup
Habit Herbs finely strigillose, more densely so distally, especially on ovary.
Stems

erect to ascending, capillary, 1–15 cm.
Leaves

linear to linear-oblanceolate, 1–3 × 0.1–0.3 cm.
Flowers

opening near sunrise;

floral tube 1.5–2 mm;

sepals 2–3 mm;

petals 2.5–5 mm; episepalous filaments 2–4 mm, epipetalous filaments 1.5–2.8 mm, sometimes epipetalous stamens absent, anthers of longer stamens 0.7–0.8 mm, those of shorter ones 0.5–0.6 mm;

style 4.5–6 mm, sparsely pubescent near base, stigma 0.7–0.8 mm diam., surrounded by anthers at anthesis.
Capsules

ascending, strongly flattened from unequal width of valves, 5–10 × 1–1.3 mm.
Seeds

0.7–1.3 × 0.3–0.4 mm.
2n

= 14.

Neoholmgrenia hilgardii
Phenology Flowering May–Jul.
Habitat Sandy or clay soil, in sagebrush scrub.
Elevation 0–500 m. (0–1600 ft.)
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Neoholmgrenia hilgardii is probably self-compatible but outcrossing. The species occasionally grows sympatrically with N. andina (P. H. Raven 1969). It is known from Chelan, Douglas, Grant, Kittitas, Okanagan, and Yakima counties, Washington. The species was collected twice along the lower Columbia River, at Bingen, Klickitat County, Washington, and Hayden Island, Multnomah County, Oregon.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Neoholmgrenia
Sibling taxa
N. andina
Synonyms Oenothera hilgardii, Camissonia hilgardii, Holmgrenia hilgardii, O. andina var. hilgardii, Sphaerostigma andinum var. hilgardii, S. hilgardii
Name authority (Greene) W. L. Wagner & Hoch: Novon 19: 132. (2009)
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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