Flora of North America species comparison

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Camissoniopsis hardhamiae

Camissoniopsis bistorta

Hardham's evening-primrose

California sun cup, southern suncup
Habit Herbs annual, villous, also glandular puberulent distally. Herbs annual, rarely short-lived perennial, usually villous, sometimes strigillose.
Stems

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

1–several from base, ascending or decumbent, to 80 cm.
Leaves

1–12 × 0.4–1.8 cm;

subsessile;

blade lanceolate, narrowly elliptic, or narrowly ovate, base truncate, margins dentate, apex acute.

1.2–12 × 0.2–1.5 cm;

petiole 0–4 cm, distal ones 0–0.3 cm;

blade (basal) narrowly elliptic or (cauline) usually narrowly lanceolate or lanceolate, rarely linear, base (basal) narrowly cuneate, (cauline) cuneate or subcordate, margins usually sparsely and inconspicuously denticulate, apex acute.
Flowers

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.

opening near sunrise;

floral tube 2–5(–7.5) mm;

sepals (2.3–)5–8(–11) mm;

petals yellow, each usually with 1 bright red dot, rarely 2, near base, (4.2–)7–15 mm; episepalous filaments (1–)1.5–3.5 mm, epipetalous filaments (0.5–)1–2.5 mm, anthers (0.5–)1.3–2(–2.5) mm, less than 5% of pollen grains 4- or 5-pored;

style (5.5–)7–12 mm, stigma exserted beyond anthers at anthesis.
Capsules

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

straight or somewhat contorted, weakly 4-angled, 12–40 × 1.5–2.5 mm.
Seeds

0.7–1.1 mm.

0.9–1 mm.
2n

= 42.

= 14.

Camissoniopsis hardhamiae

Camissoniopsis bistorta
Phenology Flowering Mar–May. Flowering Mar–Jun.
Habitat Sandy soils, limestone, disturbed oak woodlands. Sandy or clayey soils, coastal strands, grasslands, coastal sage scrub, chaparral, oak woodlands, margins of Sonoran and Mojave deserts, rarely higher elevation meadows.
Elevation 150–1000 m. (500–3300 ft.) 0–1600(–2600) m. (0–5200(–8500) ft.)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)

Camissoniopsis bistorta occurs in California from Ventura County south and east through the counties of southern Los Angeles, southwestern San Bernardino, Orange, western Riverside, and the western two-thirds of San Diego, reaching the margins of the desert in San Bernardino and San Diego counties, and southward in cismontane Baja California to Ojos Negros and San Vicente. The species occurs at exceptionally high elevations in the Santa Ana drainage of the San Bernardino Mountains. P. H. Raven (1969) indicated that there were occasional apparent hybrids between C. cheiranthifolia subsp. suffruticosa and C. bistorta occurring in intermediate habitats in areas where the two species co-occur. He determined that C. bistorta is self-incompatible.

Camissoniopsis bistorta was apparently introduced with stream gravel in 1959 in Goleta Marsh, Santa Barbara, California, and on ballast heaps at Nanaimo, Vancouver Island, British Columbia, in 1893. It has apparently not persisted at either site.

Oenothera heterophylla Nuttall ex Hooker & Arnott (1839), not Spach (1836), is an illegitimate name that pertains to Camissoniopsis bistorta.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
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. hirtella, C. ignota, C. intermedia, C. lewisii, C. luciae, C. micrantha, C. pallida, C. robusta
C. cheiranthifolia, C. confusa, C. guadalupensis, C. hardhamiae, C. hirtella, C. ignota, C. intermedia, C. lewisii, C. luciae, C. micrantha, C. pallida, C. robusta
Synonyms Camissonia hardhamiae Oenothera bistorta, Camissonia bistorta, O. bistorta var. veitchiana, Sphaerostigma bistortum, S. bistortum var. veitchianum, S. veitchianum
Name authority (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 204. (2007) (Nuttall ex Torrey & A. Gray) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 204. (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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