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Photo is of parent taxon

Peirson's clavate fruit primrose

Habit Herbs villous, at least proximally, also glandular puberulent. Herbs villous, at least proximally, rarely strigillose or glandular puberulent.
Stems

5–40 cm.

5–60 cm.

Leaves

blade lateral lobes poorly developed, small or absent, terminal lobe lanceolate, to 4 × 2 cm, margins irregularly dentate.

blade lateral lobes usually well developed, terminal lobe narrowly ovate, to 9 × 3.5 cm, margins irregularly sinuate-dentate.

Flowers

opening at sunset;

buds with conspicuous, subapical free tips;

floral tube orange-brown inside, 3.5–5 mm;

petals yellow, fading brick red, 3–5 mm.

opening at sunset;

buds with conspicuous, subapical free tips;

floral tube orange-brown inside, 2.5–4.5 mm;

petals usually yellow, rarely white, not changing color in fading, 4.5–7 mm.

2n

= 14.

= 14.

Chylismia claviformis subsp. rubescens

Chylismia claviformis subsp. peirsonii

Phenology Flowering Mar–Apr. Flowering Feb–Apr.
Habitat Sandy flats, with Ambrosia dumosa, Carnegiea gigantea, and Larrea. Sandy flats or washes, with Ambrosia dumosa, Fouquieria splendens, and Larrea.
Elevation 60–400 m. (200–1300 ft.) -70–400 m. (-200–1300 ft.)
Distribution
from FNA
AZ; Mexico (Sonora)
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[BONAP county map]
Discussion

Subspecies rubescens is known from western Maricopa, eastern Pima, and southeastern Yuma counties, Arizona, and northwestern Sonora. It intergrades with subsp. peeblesii and hybridizes with Chylismia brevipes subsp. arizonica.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Subspecies peirsonii is known from east of the Salton Sea and Imperial Valley in Imperial and San Diego counties, California, and in northeastern Baja California to the Gulf of California. It intergrades with subsp. aurantiaca.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia > Chylismia claviformis Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia > Chylismia claviformis
Sibling taxa
C. claviformis subsp. aurantiaca, C. claviformis subsp. claviformis, C. claviformis subsp. cruciformis, C. claviformis subsp. funerea, C. claviformis subsp. integrior, C. claviformis subsp. lancifolia, C. claviformis subsp. peeblesii, C. claviformis subsp. peirsonii, C. claviformis subsp. yumae
C. claviformis subsp. aurantiaca, C. claviformis subsp. claviformis, C. claviformis subsp. cruciformis, C. claviformis subsp. funerea, C. claviformis subsp. integrior, C. claviformis subsp. lancifolia, C. claviformis subsp. peeblesii, C. claviformis subsp. rubescens, C. claviformis subsp. yumae
Synonyms Oenothera claviformis subsp. rubescens, Camissonia claviformis subsp. rubescens Oenothera claviformis var. peirsonii, Camissonia claviformis subsp. peirsonii, C. peirsonii, O. claviformis subsp. peirsonii
Name authority (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007) (Munz) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007)
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