Clarkia biloba

(Durand) A. Nelson & J. F. Macbride

Bot. Gaz. 65: 60. 1918.

Common names: Two lobed clarkia
Basionym: Oenothera biloba Durand Pl. Pratten. Calif., 87. 1855
Synonyms: Godetia biloba (Durand) S. Watson
Treatment appears in FNA Volume 10.
Revision as of 16:58, 27 April 2022 by imported>Volume Importer
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Stems erect, 30–100 cm, strigil­lose. Leaves: petiole to 15 mm; blade linear to lanceolate, 2–8 cm. Inflorescences open racemes, axis recurved at tip in bud; buds pendent. Flowers: floral tube 1–4 mm; sepals reflexed together to 1 side; corolla rotate to bowl-shaped, petals purplish to pale pink, lavender, or bright pink to magenta, often red-flecked, broadly to narrowly fan-shaped, 10–25 mm, shallowly to deeply 2-lobed; stamens 8, unequal, outer anthers lavender, inner ones smaller, paler. Capsules 10–25 mm. Seeds brown, 1 mm, minutely scaly to puberulent, crest inconspicuous.

Discussion

Subspecies 3 (3 in the flora): California.

Clarkia biloba is most closely related to C. lingulata, which is derived from C. biloba subsp. australis. Some populations of C. biloba subsp. brandegeeae (originally described as a form of C. dudleyana) are morphologi­cally very similar to some individuals of C. dudleyana but the two taxa are separated geographically, have different chromosome numbers, and hybrids between them are sterile.

Selected References

None.

Key

1 Petals bright pink to magenta, narrowly fan-shaped, length greater than 1.5 times width. Clarkia biloba subsp. australis
1 Petals lavender to pale or purplish pink, broadly fan-shaped, length not greater than 1.5 times width. > 2
2 Petals purplish to pale pink, deeply 2-lobed, lobes usually 1/5–1/2 petal length. Clarkia biloba subsp. biloba
2 Petals lavender, shallowly 2-lobed, lobes usually less than 1/5 petal length, sometimes obscure. Clarkia biloba subsp. brandegeeae