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Streptanthus callistus

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)
eFlora Treatment Author: Ihsan A. Al-Shehbaz

Streptanthus callistus J.L. Morrison
Habit: Annual, bristly hairy. Stem: 2--9 cm, simple or branched, bristly especially proximally. Leaf: basal not rosetted, oblong to obovate, dentate; mid-cauline sessile, 0.8--1.7 cm, 0.4--1.3 cm wide, broadly ovate to obovate, bristly, dentate, base clasping; distal similar, reduced. Inflorescence: open, axis straight; terminal sterile flower cluster present. Flower: calyx bell-shaped, sepals 3--5 mm, narrowly ovate, keeled, green to +- purple; petals 8--11 mm, 2.5--3.5 mm wide, not crinkled, purple, veins darker; filaments in 3 pairs of unequal length, longest pair fused, 5--6.5 mm; fertile anthers 1.4--1.8 mm. Fruit: spreading, 1.3--2.5 cm, 2.5--3.5 mm wide, curved upwards; valves stiff-hairy, midvein prominent; stigma +- 2-lobed; pedicels spreading, 2--3 mm. Seed: 40--60, 1.2--1.5 mm, ovoid; wing 0. Chromosomes: 2n=28.
Ecology: Open chaparral, gravelly sedimentary scree; Elevation: 500--900 m. Bioregional Distribution: se SnFrB (Arroyo Bayo, Mount Hamilton Range). Flowering Time: Apr--May Note: Most endangered taxon in genus.
eFlora Treatment Author: Ihsan A. Al-Shehbaz
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Listed on CNPS Rare Plant Inventory

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botanical illustration including Streptanthus callistus


Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Streptanthus callistus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on September 24, 2018.

Citation for the whole project: Jepson Flora Project (eds.) 2018, Jepson eFlora,, accessed on September 24, 2018.

Streptanthus callistus
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© 2012 Aaron Schusteff
Streptanthus callistus
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© 2011 Aaron Schusteff
Streptanthus callistus
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© 2009 Barry Breckling
Streptanthus callistus
click for enlargement
© 2012 Aaron Schusteff
Streptanthus callistus
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© 2005 Barry Breckling
Streptanthus callistus
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© 1998 John Game

More photos of Streptanthus callistus in CalPhotos

Geographic subdivisions for Streptanthus callistus:
se SnFrB (Arroyo Bayo, Mount Hamilton Range).
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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

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.