Flora of North America species comparison

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Eremothera pygmaea

dwarf suncup, pygmy evening primrose
Habit Herbs glandular puberulent, also moderately villous, sometimes sparsely so.
Stems

simple or loosely branched, (4–)12–35 cm, usually flowering only distally.
Leaves

cauline, sometimes with lower ones clustered near base,1.5–6.5 × 0.5–2 cm;

petiole 0–3.5 cm;

blade lanceolate to ovate or elliptic to subrhombic, margins crenate-dentate or serrulate.
Inflorescences

nodding.
Flowers

opening at sunset;

floral tube 1.7–2.2(–4) mm, villous in proximal 1/2 inside;

sepals 1.7–2.6 mm;

petals white, fading pinkish, 1.5–2.5 mm; episepalous filaments 1–2.2 mm, epipetalous filaments slightly shorter, anthers 0.4–0.9 mm;

style 3.2–4 mm, villous near base, stigma 0.5–0.8 mm diam., surrounded by anthers at anthesis.
Capsules

cylindrical and thickened proximally, spreading, straight to arcuate or loosely sigmoid, terete, 8–20 × 2–3 mm, regularly but tardily dehiscent.
Seeds

dimorphic, light brown, ca. 1 mm, those at base of capsule coarsely papillose, those of upper portion finely reticulate.
2n

= 14, 28.

Eremothera pygmaea
Phenology Flowering late May–Aug.
Habitat Steep, loose slopes, in scree, on gravelly flats or washes.
Elevation 150–1500 m. (500–4900 ft.)
Distribution
from FNA
ID; OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

P. H. Raven (1969) determined Eremothera pygmaea to be self-compatible and autogamous. It is rare and local at scattered localities in eastern Washington (Douglas, Grant, and Kittitas counties), eastern Oregon (Gilliam, Grant, Harney, and Wheeler counties), and at one locality in adjacent southern Idaho (Jerome County).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Eremothera
Sibling taxa
E. boothii, E. chamaenerioides, E. gouldii, E. minor, E. nevadensis, E. refracta
Synonyms Oenothera pygmaea, Camissonia pygmaea, O. boothii var. pygmaea, Sphaerostigma boothii var. pygmaeum
Name authority (Douglas) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 210. (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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