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Chylismiella pterosperma

Higher Taxonomy
Family: OnagraceaeView DescriptionDichotomous Key

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: ChylismiellaView Description 

Species In Genus: 1 sp.: western United States. Etymology: (Latin: diminutive of Chylismia) Note: Incl in Camissonia in TJM (1993).

Chylismiella pterosperma (S. Watson) W.L. Wagner & Hoch
Habit: Annual, from taproot; hairs bristly, in inflorescence also glandular. Stem: erect, branched, 2--14 cm, slender, peeling near base. Leaf: cauline, alternate, +- sessile; blade 3--30 mm, narrowly lanceolate to oblanceolate, entire. Inflorescence: raceme, nodding in bud. Flower: opening at dawn; hypanthium 1--2 mm; sepals 4, 1.5--2.5 mm, reflexed singly or occasionally in pairs; petals 4, 1.5--2.5 mm, notched at tip, white, with yellow area at base, fading purple; longer stamens opposite sepals, anthers attached at base, pollen grains 3-angled; stigma hemispheric, +- = anthers, self-pollinated. Fruit: (3)4-chambered, ascending or spreading, 12--28 mm, 0.6--0.8 mm wide, straight or slightly curved, cylindric, slightly swollen by seeds; pedicel 4--8 mm. Seed: in 2 rows per chamber, 1--1.5 mm, with concave and convex sides, concave side with a thick wing, both sides densely covered with glassy club-shaped hairs. Chromosomes: 2n=14.
Ecology: Uncommon. Well-drained, generally volcanic slopes, pinyon/juniper woodland, sagebrush scrub; Elevation: 1400--2400 m. Bioregional Distribution: W&I (Inyo Mtns), DMtns (Panamint Range); Distribution Outside California: to Oregon, western Utah, northwestern Arizona. Flowering Time: May--Jun Note: Self-pollinated.
Synonyms: Camissonia pterosperma (S. Watson) P.H. Raven; Oenothera pterosperma S. Watson
eFlora Treatment Author: Warren L. Wagner & Peter C. Hoch, family description, key to genera; treatment of genera by Warren L. Wagner
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botanical illustration including Chylismiella pterosperma


Citation for this treatment: Warren L. Wagner & Peter C. Hoch, family description, key to genera; treatment of genera by Warren L. Wagner 2016. Chylismiella pterosperma, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 06, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 06, 2016.

Chylismiella pterosperma
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© 2013 James M. Andre
Chylismiella pterosperma
click for enlargement
© 2001 Larry Blakely
Chylismiella pterosperma
click for enlargement
© 2001 Larry Blakely

More photos of Chylismiella pterosperma in CalPhotos

Geographic subdivisions for Chylismiella pterosperma:
W&I (Inyo Mtns), DMtns (Panamint Range);
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.