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Streptanthus batrachopus

Higher Taxonomy
Family: BrassicaceaeView 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)
eFlora Treatment Author: Ihsan A. Al-Shehbaz

Streptanthus batrachopus J.L. Morrison
Habit: Annual, glabrous. Stem: simple or branched near base, 0.3--1.7(2.8) dm. Leaf: basal petioled, mottled, not rosetted; mid-cauline sessile, 0.5--2.5 cm, 1--7 mm wide, lanceolate, entire or dentate, base lobed; distal similar, reduced, entire. Inflorescence: terminal sterile flower cluster 0. Flower: calyx urn-shaped, sepals 3--5 mm, ovate, keeled, +- red-purple; petals 5--8 mm, 1--1.5 mm wide, not crinkled, adaxial pair +- white, veins purple, lower +- purple; filaments in 3 pairs of unequal length, longest pair fused, 5--6 mm; fertile anthers 1.4--1.7 mm. Fruit: spreading to reflexed, 1.3--3 cm, 1--1.5 mm wide, generally straight, +- constricted between seeds; stigma entire; pedicels spreading, 1--2.5(4) mm. Seed: 12--22, 1.3--2 mm, oblong; wing (0)0.1--0.3 mm wide at tip. Chromosomes: 2n=28.
Ecology: Serpentine barrens, chaparral; Elevation: 100--600 m. Bioregional Distribution: s NCoRO, nw SnFrB (Mount Tamalpais). Flowering Time: May--Jun
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Jepson Online Interchange
Listed on CNPS Rare Plant Inventory

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botanical illustration including Streptanthus batrachopus


Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Streptanthus batrachopus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on December 16, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017, Jepson eFlora,, accessed on December 16, 2017.

Streptanthus batrachopus
click for enlargement
© 1998 John Game
Streptanthus batrachopus
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© Roxanne Bittman and CNPS
Streptanthus batrachopus
click for enlargement
© 2012 Aaron Schusteff
Streptanthus batrachopus
click for enlargement
© 2012 Aaron Schusteff
Streptanthus batrachopus
click for enlargement
© 2012 Aaron Schusteff
Streptanthus batrachopus
click for enlargement
© 2012 Aaron Schusteff

More photos of Streptanthus batrachopus in CalPhotos

Geographic subdivisions for Streptanthus batrachopus:
s NCoRO, nw SnFrB (Mount Tamalpais).
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.