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Shockley's evening-primrose

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

several, 5–150 cm.

several, 10–100 cm.

Leaves

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.

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.

Racemes

erect, elongating in flower.

erect, elongating in anthesis.

Flowers

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.

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.

Capsules

spreading to reflexed, clavate, 11–25 mm;

pedicel 3–5 mm.

erect, clavate, 7–13 mm;

pedicel 2–5 mm.

Seeds

1.5–1.8 mm.

1–1.2 mm.

2n

= 14.

Chylismia atwoodii

Chylismia heterochroma

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

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.)

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.)

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. 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
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
Synonyms Camissonia atwoodii Oenothera heterochromas., Camissonia heterochroma, C. heterochroma var. monoensis, O. heterochroma subsp. monoensis, O. heterochroma var. monoensis
Name authority (Cronquist) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 205. (2007) (S. Watson) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma)
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