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Streptanthus insignis subsp. lyonii

Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key
Habit: Annual to shrub; sap pungent, watery. Leaf: generally simple, alternate; generally both basal, cauline; stipules 0. Inflorescence: generally raceme, generally not bracted. Flower: bisexual, generally radial; sepals 4, generally free; petals (0)4, forming a cross, generally white or yellow to purple; stamens generally 6 (2 or 4), 4 long, 2 short (3 pairs of unequal length); ovary 1, superior, generally 2-chambered with septum connecting 2 parietal placentas; style 1, stigma entire or 2-lobed. Fruit: capsule, generally 2-valved, "silique" (length >= 3 × width) or "silicle" (length < 3 × width), dehiscent by 2 valves or indehiscent, cylindric or flat parallel or perpendicular to septum, segmented or not. Seed: 1--many, in 1 or 2 rows per chamber, winged or wingless; embryo strongly curved.
Genera In Family: +- 330 genera, 3780 species: worldwide, especially temperate. Note: Highest diversity in Mediterranean area, mountains of southwestern Asia, adjacent central Asia, western North America; some Brassica species are oil or vegetable crops; Arabidopsis thaliana used in experimental molecular biology; many species are ornamentals, weeds. Aurinia saxatilis (L.) Desvaux in cultivation only. Aubrieta occasional waif in central NCoR, Carrichtera annua (L.) DC. in SCo, Iberis sempervirens L., Iberis umbellata L. in PR, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern NCoRO, CCo. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella.
eFlora Treatment Author: Ihsan A. Al-Shehbaz, except as noted
Scientific Editor: Douglas H. Goldman, Bruce G. Baldwin.
Genus: StreptanthusView DescriptionDichotomous Key

Habit: Annual to perennial herb, generally +- glaucous; hairs simple or 0. Leaf: basal rosetted or not, petioled, entire or dentate to pinnately lobed or divided; cauline sessile, occasionally petioled, base generally lobed or clasping. Inflorescence: open, elongated, bracts 0 or bracted below proximal 1--2 flowers, sometimes with sterile flower cluster. Flower: radial or bilateral; calyx urn- or occasionally bell-shaped, sepals erect, base +- sac-like, keeled or not; petal blade narrower to wider than proximal 1/2, generally channeled, margins +- crinkled or not; stamens in 3 pairs of unequal length, or 4 long and 2 short, longest filaments fused or free. Fruit: silique, dehiscent, linear, flat parallel to septum, unsegmented; stigma entire or 2-lobed. Seed: 10--120, in 1 row, generally winged.
Etymology: (Greek: twisted flower, from wavy-margined petals)
eFlora Treatment Author: Robert E. Preston & Ihsan A. Al-Shehbaz
Reference: Mayer & Beseda 2010 Ann Missouri Bot Gard 97:106--116; Preston et al. 2019 Madroño 66:24--29; Jensen 2020 Madroño 67:19--34; Preston 2023 Phytoneuron 2023-22:1--10
Species: Streptanthus insignisView Description 

Habit: Annual, bristly throughout. Stem: simple or branched distally, 1.2--6 dm. Leaf: basal not rosetted, lanceolate to oblanceolate, coarsely dentate to pinnately lobed; mid-cauline sessile, 1.3--9 cm, lanceolate, dentate, basally lobed; distal reduced, dentate. Inflorescence: not bracted; terminal cluster of dark purple, pale yellow, or +- green-yellow sterile flowers present. Flower: calyx bell-shaped, sepals of fertile flowers 4--6 mm, oblong to lanceolate, not or +- keeled, dark purple, +- purple, or +- green-yellow, hairy; petals 7--12 mm, 1--2 mm wide, +- purple-white, lemon-yellow, or +- yellow-white, midvein darker; filaments in 3 pairs of unequal length; longest pair completely fused, 6--9 mm, lower pair free; fertile anthers 1.3--2 mm. Fruit: ascending or reflexed, 3.5--11.4 cm, 1.5--2 mm wide, straight or +- curved, not constricted between seeds; valves sparsely to densely bristly, midvein prominent; stigma entire; pedicels spreading to ascending, 3--8 mm. Seed: 32--94, 1.4--2 mm, broadly oblong; wing 0.1--0.3 mm wide, continuous. Chromosomes: 2n=28.

Streptanthus insignis Jeps. subsp. lyonii Kruckeb. & J.L. Morrison
Inflorescence: terminal sterile flower cluster pale yellow, +- green-yellow, or +- purple. Flower: sepals of fertile flowers +- green-yellow or +- purple; petals lemon yellow or +- yellow-white. Fruit: moderately to densely bristly-hairy.
Ecology: Serpentine, grassland, oak woodland; Elevation: 200--900 m. Bioregional Distribution: SCoRI (near Ortigalita Peak, w Merced Co.). Flowering Time: Apr--May
Jepson eFlora Author: Robert E. Preston & Ihsan A. Al-Shehbaz
Reference: Mayer & Beseda 2010 Ann Missouri Bot Gard 97:106--116; Preston et al. 2019 Madroño 66:24--29; Jensen 2020 Madroño 67:19--34; Preston 2023 Phytoneuron 2023-22:1--10
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Listed on CNPS Rare Plant Inventory

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Citation for this treatment: Robert E. Preston & Ihsan A. Al-Shehbaz 2023, Streptanthus insignis subsp. lyonii, in Jepson Flora Project (eds.) Jepson eFlora, Revision 12,, accessed on May 28, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on May 28, 2024.

Streptanthus insignis subsp. lyonii
click for enlargement
©2022 Ryan O'Dell
Streptanthus insignis subsp. lyonii
click for enlargement
©2022 Ryan O'Dell
Streptanthus insignis subsp. lyonii
click for enlargement
©2022 Ryan O'Dell
Streptanthus insignis subsp. lyonii
click for enlargement
©2022 Ryan O'Dell

More photos of Streptanthus insignis subsp. lyonii
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Geographic subdivisions for Streptanthus insignis subsp. lyonii:
SCoRI (near Ortigalita Peak, w Merced Co.).
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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).


Data provided by the participants of the  Consortium of California Herbaria.
View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
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.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

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 (fruiting time in some monocot genera).