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Vascular Plants of California
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Gayophytum heterozygum


Higher Taxonomy
Family: OnagraceaeView DescriptionDichotomous Key
Common Name: EVENING-PRIMROSE FAMILY
Habit: Annual to perennial herb (to tree). Leaf: cauline or basal, alternate, opposite, or whorled, generally simple and toothed (to pinnately compound); stipules 0 or generally deciduous. Inflorescence: spike, raceme, panicle, or flowers 1 in axils; bracted. Flower: generally bisexual, generally radial, often opening at either dawn or dusk; hypanthium generally prolonged beyond ovary (measured from ovary tip to sepal base); sepals 4(2--7); petals 4(2--7, rarely 0), often fading darker; stamens 2 × or = sepals in number, anthers 2-chambered, opening lengthwise, pollen interconnected by threads; ovary inferior, chambers generally as many as sepals (sometimes becoming 1), placentas axile or parietal, ovules 1--many per chamber, style 1, stigma 4-lobed (or lobes as many as sepals), club-shaped, spheric, or hemispheric. Fruit: capsule, loculicidal (sometimes berry or indehiscent and nut-like). Seed: sometimes winged or hair-tufted.
Genera In Family: 22 genera, +- 657 species: worldwide, especially western North America; many cultivated (Clarkia, Epilobium, Fuchsia, Oenothera). Note: Gaura moved to Oenothera. Fuchsia magellanica Lam. naturalized in northern California.
eFlora Treatment Author: Warren L. Wagner & Peter C. Hoch, family description, key to genera, treatment of genera by Warren L. Wagner, except as noted
Scientific Editor: Robert Patterson, Bruce G. Baldwin.
Genus: GayophytumView DescriptionDichotomous Key


Habit: Annual. Stem: generally erect, < 1 m, slender; hairs 0 to dense, rarely glandular. Leaf: cauline, alternate (or +- opposite near base), petioled or not, narrow-lanceolate, entire. Inflorescence: flowers axillary, pedicelled or not, opening at dawn. Flower: hypanthium inconspicuous; sepals 4, staying fused in 2s or all coming free; petals 4, 0.5--8 mm, white, with 1--2 yellow or +- green spots at base, fading pink or red; stamens 8, those opposite sepals longer, pollen +- yellow; ovary chambers 2, stigma generally not exserted beyond anthers, generally touching them, generally +- spheric. Fruit: capsule, +- cylindric or flat; valves 4, generally all coming free, generally equal. Seed: few to many, generally all maturing, generally appressed to septum, alternate or +- opposite between chambers, in each chamber generally in 1 row and generally not overlapped, 0.5--2.3 mm, ovoid, glabrous or hairy, brown or gray mottled with brown; appendages 0.
Species In Genus: +- 9 species: western North America, 2 South America. Etymology: (C. Gay, French author of Flora of Chile, 1800--1873) Note: Self-fertile; taxa with petals < 3 mm self-pollinated.
eFlora Treatment Author: Harlan Lewis
Unabridged Reference: Lewis & Szweykowski 1964 Brittonia 16:343--391
Gayophytum heterozygum H. Lewis & Szweyk.
NATIVE
Stem: < 80 cm; branches generally 0 at base, forked distally. Leaf: 1.5--6 cm, much reduced distally on stem. Inflorescence: 1st flower generally 10--20 nodes distal to base. Flower: petals generally 2--3 mm; larger stamens 2--4 mm, pollen +- 50% aborted; ovary hairy, stigma exserted beyond anthers, hemispheric or not. Fruit: 6--15 mm, > pedicel, very irregular, lumpy. Seed: 2--10 maturing, +- 50% aborted, irregularly alternate, glabrous to densely puberulent. Chromosomes: 2n=14.
Ecology: Open montane forest; Elevation: 500--3000 m. Bioregional Distribution: KR, NCoRH, CaRH, SNH, Teh, SCoRO, TR, PR, Wrn; Distribution Outside California: to Washington, Nevada. Flowering Time: Jun--Oct Note: Generally self-pollinated; stable hybrid, probably between Gayophytum eriospermum, Gayophytum oligospermum.
Jepson eFlora Author: Harlan Lewis
Unabridged Reference: Lewis & Szweykowski 1964 Brittonia 16:343--391
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Botanical illustration including Gayophytum heterozygum

botanical illustration including Gayophytum heterozygum

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Citation for this treatment: Harlan Lewis 2012, Gayophytum heterozygum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=26543, accessed on November 11, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on November 11, 2019.

Gayophytum heterozygum
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© 2003 Christopher L. Christie

More photos of Gayophytum heterozygum in CalPhotos



Geographic subdivisions for Gayophytum heterozygum:
KR, NCoRH, CaRH, SNH, Teh, SCoRO, TR, PR, Wrn
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).





 

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Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.