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Shockley's evening-primrose

Habit Herbs annual, glandular puberulent throughout, or glabrate and glaucous distally. Herbs annual, glandular puberulent.
Stems

several, 10–100 cm.

several, 5–150 cm.

Leaves

primarily in poorly defined basal rosette, cauline greatly reduced when present;

petiole 0.4–8 cm;

blade unlobed, ovate to cordate, 2–11.5 × 1.4–5 cm, margins sinuate-dentate, brown oil cells prominently lining veins abaxially.

in poorly defined basal rosette and cauline;

petiole 0.7–3.4 cm;

blade unlobed, broadly ovate to oblong-ovate, elliptic, or subcordate, 1.2–7.6 × 0.8–5.5 cm, margins serrulate to serrate-denticulate, brown oil cells prominently lining veins abaxially.

Racemes

erect, elongating in anthesis.

erect, elongating in flower.

Flowers

opening at sunrise;

buds without free tips;

floral tube 2–5 mm, villous inside;

sepals 1.5–3.5 mm;

petals lavender, paler and often with flecks toward base, often yellow at very base, fading darker lavender, 2–6 mm;

stamens unequal, filaments of antisepalous ones 1.8–3 mm, of antipetalous ones 1–2.5 mm, anthers 0.6–1 mm, glabrous or sparsely ciliate;

style 4–7 mm, stigma surrounded by anthers at anthesis.

opening at sunrise;

buds without free tips;

floral tube 0.6–1 mm;

sepals 5–7 mm;

petals purple, fading darker purple, 7–14 mm;

stamens 4 + 4, unequal, anthers 1.5–2 mm, glabrous, stigma exserted beyond anthers at anthesis.

Capsules

erect, clavate, 7–13 mm;

pedicel 2–5 mm.

spreading to reflexed, clavate, 11–25 mm;

pedicel 3–5 mm.

Seeds

1–1.2 mm.

1.5–1.8 mm.

2n

= 14.

Chylismia heterochroma

Chylismia atwoodii

Phenology Flowering May–Jun. Flowering Aug–Nov.
Habitat Alluvial and rocky slopes. Open slopes in desert shrub communities, on clay soil.
Elevation 600–2200 m. (2000–7200 ft.) 1100–1600 m. (3600–5200 ft.)
Distribution
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
from FNA
UT
[BONAP county map]
Discussion

Chylismia heterochroma is known from Churchill and Lander counties, Nevada, south to Lincoln and southern Nye counties, Nevada, to adjacent California (Mono Lake, Mono County, and central Inyo counties). P. H. Raven (1962, 1969) determined this species to be self-compatible and autogamous.

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

Chylismia atwoodii is known only from eastern Kane County, and only from a few collections, so is still poorly characterized morphologically, but clearly distinct among the purple-petaled species.

(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 Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia
Sibling taxa
C. arenaria, C. atwoodii, C. brevipes, C. cardiophylla, C. claviformis, C. confertiflora, C. eastwoodiae, C. exilis, C. megalantha, C. multijuga, C. munzii, C. parryi, C. scapoidea, C. specicola, C. walkeri
C. arenaria, C. brevipes, C. cardiophylla, C. claviformis, C. confertiflora, C. eastwoodiae, C. exilis, C. heterochroma, C. megalantha, C. multijuga, C. munzii, C. parryi, C. scapoidea, C. specicola, C. walkeri
Synonyms Oenothera heterochromas., Camissonia heterochroma, C. heterochroma var. monoensis, O. heterochroma subsp. monoensis, O. heterochroma var. monoensis Camissonia atwoodii
Name authority (S. Watson) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma) (Cronquist) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 205. (2007)
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