Flora of North America species comparison

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Oenothera deltoides subsp. ambigua
Photo is of parent taxon

birdcage evening primrose
Habit Herbs annual, strigillose, especially distally; from a taproot.
Stems

central stem often thickened near base, branched from base, branches ascending to decumbent, not encircling stems in older plants, 5–25 cm.
Leaves

basal and cauline;

blade rhombic-obovate to -lanceolate, becoming oblanceolate to lanceolate distally, margins subentire, sometimes coarsely sinuate-dentate distally.
Flowers

buds quadrangular in distal 1/2, with free tips 1–3 mm;

sepals 20–30 mm;

petals 18–35 mm.
Capsules

40–70 × 1.5–5 mm.
2n

= 14.

Oenothera deltoides subsp. ambigua
Phenology Flowering (Mar–)Jun–Jul(–Sep).
Habitat Sandy soil in Mojave Desert with Ambrosia, Cylindropuntia, or Larrea.
Elevation 200–1300 m. (700–4300 ft.)
Distribution
from FNA
AZ; NV; UT
[BONAP county map]
Discussion

Subspecies ambigua is restricted to a relatively small area of Mojave Desert in southeastern Nevada and adjacent areas in southwestern Utah and Arizona. W. M. Klein (1964) determined subsp. ambigua to be self-incompatible.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Anogra > Oenothera deltoides
Sibling taxa
O. deltoides subsp. cognata, O. deltoides subsp. deltoides, O. deltoides subsp. howellii, O. deltoides subsp. piperi
Synonyms O. deltoides var. ambigua, Anogra simplex, O. albicaulis var. decumbens, O. deltoides var. decumbens, O. simplex
Name authority (Munz) W. M. Klein: Aliso 5: 179. (1962)
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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