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pale yellow sun cup

beach evening-primrose, beach suncup

Habit Herbs annual, appearing conspicuously grayish, densely strigillose, sometimes also glandular puberulent distally. Herbs short-lived perennial, sometimes woody at base, usually densely strigillose throughout, rarely glabrous, also villous distally.
Stems

usually with decumbent lateral branches from basal rosette, 5–60 cm.

prostrate, decumbent, or ascending from base, to 60(–130) cm.

Leaves

1–5(–11) × 0.2–0.7(–1.4) cm;

petiole 0–0.2(–0.4) cm, distal ones sessile;

blade lanceolate to narrowly ovate, base often cuneate to truncate, sometimes attenuate, margins sparsely denticulate, apex acute to obtuse.

0.5–5 × 0.3–2.2 cm;

petiole 0–1.5(–2.5) cm, distal ones to 1 cm;

blade narrowly ovate, base attenuate, cuneate, or cordate, margins sparsely serrulate, apex acute.

Flowers

opening near sunrise;

floral tube 1–4.2 mm;

sepals (1.5–)2.5–8 mm;

petals yellow, sometimes with 1–3 red dots basally, (2–)3.5–13 mm; episepalous filaments (0.5–)1.5–6.5 mm, epipetalous filaments (0.2–)0.5–3.8 mm, anthers (0.4–)0.8–2.2 mm, less than 5% of pollen grains 4- or 5-pored;

style (2.1–)3–10.5 mm, stigma surrounded by at least anthers of longer stamens, often by both sets, at anthesis.

opening near sunrise;

floral tube 2.1–8.5 mm;

sepals 4–11.5 mm;

petals yellow, often red-dotted near base, 6–20 mm; episepalous filaments 2.8–8 mm, epipetalous filaments 1.5–6 mm, anthers 1–3 mm, less than 5% of pollen grains 4- or 5-pored;

style 6–23 mm, stigma surrounded by or exserted beyond anthers at anthesis.

Capsules

usually 1–3-coiled spiral, subterete in living material, 4-angled when dry, 13–24 × 0.7–1.2 mm.

often coiled in 1–2 spirals, 4-angled, 10–25 × 2–2.5 mm.

Seeds

1–1.5 mm.

1.2–1.3 mm.

Camissoniopsis pallida

Camissoniopsis cheiranthifolia

Distribution
w United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
w United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

P. H. Raven (1969) determined Camissoniopsis pallida to be self-compatible and primarily autogamous.

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

Subspecies 2 (2 in the flora).

Camissoniopsis cheiranthifolia occurs on slopes and dunes along the immediate coast and on islands from Coos Bay, Curry County, Oregon, to the vicinity of San Quintín, Baja California; it is also known from the east shore of San Francisco Bay and locally on sand dunes along the lower Sacramento River, California, 0–100 m. P. H. Raven (1969) determined C. cheiranthifolia to be self-incompatible (some populations in subsp. suffruticosa) or self-compatible (both subspecies) and apparently pollinated by oligolectic bees of Andrena subg. Onagrandrena (Raven); Raven subdivided the species into two intergrading subspecies.

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

Key
1. Floral tube 1–3 mm; petals (2–)3.5–6(–8) mm; styles (2.1–)3–6.5 mm.
subsp. pallida
1. Floral tube 3.8–4.2 mm; petals 6.5–13 mm; styles 6.5–10.5 mm.
subsp. hallii
1. Plants primarily herbaceous; petals 6–11 mm; style 6–9 mm; stigma usually surrounded by anthers.
subsp. cheiranthifolia
1. Plants woody at base; petals (10–)12–20 mm; style 13–23 mm; stigma exserted beyond anthers at anthesis.
subsp. suffruticosa
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Camissoniopsis Onagraceae > subfam. Onagroideae > tribe Onagreae > Camissoniopsis
Sibling taxa
C. bistorta, C. cheiranthifolia, C. confusa, C. guadalupensis, C. hardhamiae, C. hirtella, C. ignota, C. intermedia, C. lewisii, C. luciae, C. micrantha, C. robusta
C. bistorta, C. confusa, C. guadalupensis, C. hardhamiae, C. hirtella, C. ignota, C. intermedia, C. lewisii, C. luciae, C. micrantha, C. pallida, C. robusta
Subordinate taxa
C. pallida subsp. hallii, C. pallida subsp. pallida
C. cheiranthifolia subsp. cheiranthifolia, C. cheiranthifolia subsp. suffruticosa
Synonyms Sphaerostigma pallidum, Camissonia pallida, Oenothera abramsii, O. micrantha var. abramsii Oenothera cheiranthifolia, Agassizia cheiranthifolia, Camissonia cheiranthifolia, Holostigma cheiranthifolium, Sphaerostigma cheiranthifolium
Name authority (Abrams) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 205. (2007) (Hornemann ex Sprengel) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 204. (2007)
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