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Streptanthus insignis subsp. insignis

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: elongated. 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.
Species In Genus: 35 species: southwestern United States, northern Mexico. Etymology: (Greek: twisted flower, from wavy-margined petals)
Species: Streptanthus insignisView Description 

Habit: Annual, bristly throughout. Stem: 1.2--6 dm, simple or branched distally. 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: open; 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. insignis
Inflorescence: terminal sterile flower cluster dark purple. Flower: sepals of fertile flowers +- purple; petals +- purple-white. Fruit: sparsely (densely) bristly.
Ecology: Openings in chaparral, badlands, rock outcrops, talus, graywacke, shale, often serpentine; Elevation: 300--1100 m. Bioregional Distribution: SCoRI. Flowering Time: Mar--May
eFlora Treatment Author: Ihsan A. Al-Shehbaz
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botanical illustration including Streptanthus insignis subsp. insignis


Citation for this treatment: Ihsan A. Al-Shehbaz 2016. Streptanthus insignis subsp. insignis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 26, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 26, 2016.

Streptanthus insignis subsp. insignis
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© 2009 Aaron Schusteff
Streptanthus insignis subsp. insignis
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© 2005 Aaron Schusteff
Streptanthus insignis subsp. insignis
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© 2011 Dylan Neubauer
Streptanthus insignis subsp. insignis
click for enlargement
© 2009 Aaron Schusteff
Streptanthus insignis subsp. insignis
click for enlargement
© 2009 Aaron Schusteff
Streptanthus insignis subsp. insignis
click for enlargement
© 2009 Aaron Schusteff

More photos of Streptanthus insignis subsp. insignis in CalPhotos

Geographic subdivisions for Streptanthus insignis subsp. insignis:
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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.