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pale yellow sun cup

Hardham's evening-primrose

Habit Herbs annual, appearing conspicuously grayish, densely strigillose, sometimes also glandular puberulent distally. Herbs annual, villous, also glandular puberulent distally.
Stems

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

erect, with 1 or more branches from basal rosette, to 60 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.

1–12 × 0.4–1.8 cm;

subsessile;

blade lanceolate, narrowly elliptic, or narrowly ovate, base truncate, margins dentate, 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 1.7–2 mm;

sepals 1.8–3.2 mm;

petals yellow, immaculate, 2–4 mm; episepalous filaments 1.5–2 mm, epipetalous filaments 1–1.5 mm, anthers 0.7 mm, 70–100% of pollen grains 4- or 5-pored;

style 3–4 mm, stigma surrounded by anthers at anthesis.

Capsules

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

straight or 1-coiled, subterete in living material, obscurely 4-angled when dry, 13–25 × 1.3–1.6 mm.

Seeds

1–1.5 mm.

0.7–1.1 mm.

2n

= 42.

Camissoniopsis pallida

Camissoniopsis hardhamiae

Phenology Flowering Mar–May.
Habitat Sandy soils, limestone, disturbed oak woodlands.
Elevation 150–1000 m. (500–3300 ft.)
Distribution
w United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[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.)

Camissoniopsis hardhamiae is narrowly endemic to the Outer South Coast Ranges. Populations are very local, known only from a few localities in sandy soil in disturbed oak woodland, southernmost Monterey to central San Luis Obispo County. P. H. Raven (1969) determined C. hardhamiae to be self-compatible and primarily autogamous. The species is apparently a hexaploid derived via hybridization between the tetraploid C. intermedia (2n = 28) and the diploid C. micrantha (2n = 14).

(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
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. cheiranthifolia, C. confusa, C. guadalupensis, 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
Synonyms Sphaerostigma pallidum, Camissonia pallida, Oenothera abramsii, O. micrantha var. abramsii Camissonia hardhamiae
Name authority (Abrams) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 205. (2007) (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 204. (2007)
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