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Key to families | Table of families and genera
Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.
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.
± 9 species: western North America, 2 South America. (C. Gay, French author of Flora of Chile, 1800–1873) Self-fertile; taxa with petals < 3 mm self-pollinated.
Unabridged references: [Lewis & Szweykowski 1964 Brittonia 16:343–391]
1. Petals 3–8 mm; stigma exserted beyond anthers (see also Gayophytum heterozygum)
2. Petals 3–7 mm; Cascade Range, n High Sierra Nevada (Plumas Co.), San Bernardino Mountains, Warner Mountains ..... G. diffusum subsp. diffusum
2' Petals 4–8 mm; Sierra Nevada (s of Placer Co.) ..... G. eriospermum
1' Petals 0.5–3 mm; stigma generally not exserted beyond anthers
3. Seeds ± 50% aborted; fruit very irregular, lumpy ..... G. heterozygum
3' Seeds all maturing; fruit not irregular, smooth to very knobby
4. Fruit flat; plant generally branched only proximally, 2° branches 0–many
5. Lateral fruit valves staying attached; petals 0.8–1.5 mm; larger stamens ± 0.7 mm ..... G. humile
5' All fruit valves coming free; petals 1.3–1.8 mm; larger stamens 0.8–1.5 mm ..... G. racemosum
4' Fruit ± cylindric; plant branched only distally to throughout, 2° branches generally many
6. Seeds in each chamber overlapped, generally in 2 rows
7. Petals 1.2–3 mm; pedicel generally < fruit ..... G. diffusum subsp. parviflorum (3)
7' Petals 0.7–1.5 mm; pedicel generally > fruit ..... G. ramosissimum
6' Seeds in each chamber not overlapped, in 1 row
8. Seeds > 9, ± opposite; fruit slightly knobby
9. Branches ± throughout, generally 2–8 nodes between ..... G. decipiens
9' Branches at base or not, many distally, generally 0–1 node between ..... G. diffusum subsp. parviflorum (3)
8' Seeds (1)3–9, generally alternate; fruit very knobby
10. Seeds 6–9; fruit generally > pedicel ..... G. diffusum subsp. parviflorum (3)
10' Seeds (1)3–5; fruit ± = pedicel ..... G. oligospermum
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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