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Streptanthus callistus
MOUNT HAMILTON JEWELFLOWER

Higher Taxonomy
Family: Brassicaceae (Cruciferae)View DescriptionDichotomous Key

Common Name: MUSTARD FAMILY
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

Common Name: JEWELFLOWER
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)

Streptanthus callistus J.L. Morrison
NATIVE
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

Previous taxon: Streptanthus breweri
Next taxon: Streptanthus campestris

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Citation for this treatment: Ihsan A. Al-Shehbaz 2016. Streptanthus callistus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=45726, accessed on August 31, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on August 31, 2016.


Streptanthus callistus
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© 2011 Aaron Schusteff
Streptanthus callistus
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© 2014 Aaron Schusteff
Streptanthus callistus
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© Roxanne Bittman and CNPS
Streptanthus callistus
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© 2012 Aaron Schusteff
Streptanthus callistus
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© 2009 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.
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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).

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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.