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Habit Herbs annual, succulent, glabrous, glandular puberulent, or villous proximally. Herbs annual, glandular pubescent throughout.
Stems

unbranched or branched from base, 3–30 cm.

several, 10–200 cm.

Leaves

primarily in basal rosette and also cauline;

petiole 0.5–8 cm;

blade usually not pinnately lobed or, if so, then lateral lobes greatly reduced, terminal lobe oblanceolate to cordate, 0.8–7.5 × 0.4–3 cm, margins entire or sparsely denticulate, pale brown oil cells lining veins abaxially.

in poorly defined basal rosette and cauline;

petiole 1.8–5.5 cm;

blade unlobed, broadly cordate to ovate, 2.4–8 × 7 cm, margins sinuate-dentate, yellowish oil cells prominently lining veins abaxially.

Racemes

nodding, elongating after anthesis.

erect, elongating in flower.

Flowers

opening at sunrise;

buds without subapical free tips;

floral tube 2–4.5 mm, villous inside proximally;

sepals 3–8 mm;

petals bright yellow, with red dots near base, fading pale yellow or yellowish orange, 5.5–9 mm;

stamens unequal, filaments of antisepalous stamens 3–8 mm, those of antipetalous ones 2.8–5.5 mm, anthers 2–4 mm, ciliate;

style 10–17 mm, stigma exserted beyond anthers at anthesis.

opening at sunrise;

buds without free tips;

floral tube 4–9 mm, with matted, villous hairs inside;

sepals 4.5–9 mm;

petals pale to dark lavender, diffusely purplish-flecked near base, white at very base, fading darker lavender, 9–14 mm;

stamens unequal, filaments of antisepalous stamens 6–12 mm, of antipetalous ones 3.5–8 mm, anthers 2 mm, glabrous;

style 14–22.5 mm, stigma exserted beyond anthers at anthesis.

Capsules

erect, spreading, or slightly reflexed, clavate, 18–40 mm;

pedicel 4–28 mm.

erect or ascending, clavate, 8–14 mm;

pedicel 2–3.5 mm.

Seeds

1.2–1.7 mm.

1–1.3 mm.

2n

= 14.

= 14.

Chylismia eastwoodiae

Chylismia megalantha

Phenology Flowering Apr–Jun. Flowering Jun–Oct.
Habitat Clay flats, on gray, alkaline, marine-deposited gumbo, sandy draws. Rubble derived from volcanic tuff, partly on moist soil along springs.
Elevation 1200–1800 m. (3900–5900 ft.) 1200–1400 m. (3900–4600 ft.)
Distribution
from FNA
CO; UT
[BONAP county map]
from FNA
NV
[BONAP county map]
Discussion

Chylismia eastwoodiae is known from Mesa County, Colorado, and from Emery County south to San Juan County, Utah. P. H. Raven (1962, 1969) suspected this species to be self-incompatible, but did not have data to make the determination.

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

Chylismia megalantha is known from around Frenchman Drainage to French Peak and Skull Mountain in southern Nye County. P. H. Raven (1962, 1969) determined this species to be self-compatible, but outcrossing.

(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. 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. heterochroma, C. multijuga, C. munzii, C. parryi, C. scapoidea, C. specicola, C. walkeri
Synonyms Oenothera scapoidea var. eastwoodiae, Camissonia eastwoodiae, O. eastwoodiae Oenothera heterochromas. var. megalantha, Camissonia megalantha, O. megalantha
Name authority (Munz) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007) (Munz) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007)
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