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Vascular Plants of California
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Caulanthus lasiophyllus

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: CaulanthusView DescriptionDichotomous Key

Habit: Annual to perennial herb, glabrous or hairs simple (forked). Leaf: basal rosetted or not, petioled, entire, dentate or pinnately lobed, generally deciduous; cauline petioled, or sessile with bases lobed or sagittate. Inflorescence: elongated. Flower: calyx urn-shaped or cylindric, sepals erect (spreading), base sac-like or not; petals yellow, purple, brown, or white, generally channeled, margin wavy or not; stamens in 3 pairs of equal length, or 4 long and 2 short, (all equal), free or filaments of longer pair(s) fused. Fruit: silique, linear, dehiscent, unsegmented, +- sessile, cylindric (flat perpendicular or parallel to septum); stigma entire or 2-lobed. Seed: 24--210, 1 row per chamber, oblong to ovate (+- spheric), plump, wing 0.
Species In Genus: 17 species: southwestern United States, northwestern Mexico. Etymology: (Greek: stem flower, in reference to insertion of flowers along stem)
eFlora Treatment Author: Ihsan A. Al-Shehbaz
Caulanthus lasiophyllus (Hook. & Arn.) Payson
Habit: Annual, sparsely to densely stiff-hairy. Stem: erect, (0.8)2--10(16) dm, not inflated, simple or branched. Leaf: basal lanceolate to oblong or oblanceolate, pinnately lobed to dentate; distal cauline short petioled, smaller, base not lobed. Inflorescence: elongated; terminal sterile flower cluster 0. Flower: calyx cylindric, sepals erect, 2--4 mm, generally green; petals 2.5--5(6.5) mm, white to creamy white or +- pink, not channeled, margin not wavy; stamens 4 long, 2 short. Fruit: erect to reflexed, 2--4.8(5.7) cm, 0.7--1.2 mm wide, straight to outcurved; style 0.5--2 mm, stigma +- entire; pedicel strongly reflexed to spreading, (0.7)1--2.2(3) mm. Seed: 14--60, 0.9--1.5 mm, oblong. Chromosomes: 2n=28.
Ecology: Common. Desert flats, sandy banks, gravelly or rocky areas, talus slopes, shrubland, grassy fields, disturbed sites; Elevation: < 1400 m. Bioregional Distribution: CA (exc MP); Distribution Outside California: to British Columbia, Utah, northwestern Mexico. Flowering Time: Mar--Jun Note: Highly variable in flower size, seed number, leaf division, fruit orientation and size, hair density.
Synonyms: Guillenia lasiophylla (Hook. & Arn.) Greene; Caulanthus lasiophyllus var. inalienus (B.L. Rob.) Payson; Caulanthus lasiophyllus var. rigidus (Greene) Payson; Caulanthus lasiophyllus var. utahensis (Rydb.) Payson; Thelypodium lasiophyllum (Hook. & Arn.) Greene; Thelypodium lasiophyllum var. lasiophyllum; Thelypodium lasiophyllum var. utahense (Rydb.) Jeps.; Thelypodium lasiophyllum var. inalienum B.L. Rob.; Thelypodium lasiophyllum var. rigidum (Greene) B.L. Rob.
Unabridged Note: Var. names were also variously placed in Guillenia, Microsisymbrium, Streptanthus, Thelypodium.
Jepson eFlora Author: Ihsan A. Al-Shehbaz
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Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Caulanthus lasiophyllus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on April 21, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora,, accessed on April 21, 2019.

Caulanthus lasiophyllus
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© 2016 Steve Matson
Caulanthus lasiophyllus
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© 2008 Keir Morse
Caulanthus lasiophyllus
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© 2003 Michael Charters
Caulanthus lasiophyllus
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© 2008 Keir Morse
Caulanthus lasiophyllus
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© 2010 Neal Kramer
Caulanthus lasiophyllus
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© 2013 Neal Kramer

More photos of Caulanthus lasiophyllus in CalPhotos

Geographic subdivisions for Caulanthus lasiophyllus:
CA (exc MP);
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, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.