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BRASSICACEAE (Cruciferae) MUSTARD FAMILY

Ihsan A. Al-Shehbaz, except as noted

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.
± 330 genera, 3780 species: worldwide, especially temperate. [Al-Shehbaz et al. 2006 Plant Syst Evol 259:89–120] 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 North Coast Ranges, Carrichtera annua (L.) DC. in South Coast, Iberis sempervirens L., Iberis umbellata L. in Peninsular Ranges, Teesdalia coronopifolia (Bergeret) Thell., Teesdalia nudicaulis (L.) W.T. Aiton in southern Outer North Coast Ranges, Central Coast. Cardaria, Coronopus moved to Lepidium; Caulostramina to Hesperidanthus; Guillenia to Caulanthus; Heterodraba to Athysanus; California taxa of Lesquerella to Physaria; Malcolmia africana to Strigosella. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.

Key to Brassicaceae

TROPIDOCARPUM
Annual; hairs simple, or stalked-forked. Stem: prostrate to erect, branched at least distally. Leaf: basal not rosetted; proximal cauline deeply pinnately lobed, lateral lobes entire to dentate or lobed; distal short-petioled to sessile, less divided, not basally lobed. Inflorescence: bracted. Flower: sepals oblong, erect to ascending, base not sac-like; petals obovate to oblanceolate or spoon-shaped, yellow or occasionally tinged purple, short-clawed. Fruit: silique, linear to oblong, or obconic silicle, dehiscent, unsegmented, flat perpendicular to septum (or septum 0); valves 2 or 4. Seed: 4–70, 1 or 4 rows per chamber; wing 0.
4 species: California, Baja California, Chile. (Greek: keeled fruit) [Al-Shehbaz 2003 Novon 13:392–395]

Key to Tropidocarpum

T. gracile Hook.
NATIVE
Stem: (0.4)1–4.5(6) dm. Leaf: blade (1.5)2.5–10(15) cm; lateral lobes entire to dentate or pinnately lobed, pairs 3–8(12). Flower: sepals 2.5–4 mm; petals 3–6 mm, 1.5–4 mm wide, yellow, occasionally tinged purple. Fruit: silique, linear, (2.5)3–6(7) cm, 1.5–2(3) mm wide, length 13–46 × > width; valves 2; style (0.3)0.5–2.5(4) mm; pedicels erect to ascending, (4)6–17(35) mm. Seed: 30–70, 1.2–1.6 mm, oblong.
2n=16. Common. Grassy banks, open fields, roadsides, pastures; < 1450 m. s Outer North Coast Ranges, Inner North Coast Ranges, Cascade Range Foothills, Sierra Nevada Foothills, Tehachapi Mountain Area, Great Central Valley, Central Western California, Southwestern California, w Mojave Desert; Baja California. Mar–May [Online Interchange]
Unabridged synonyms: [Tropidocarpum gracile var. dubium (Davidson) Jeps.]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Aug 20 2014
Citation for this treatment: [Author of taxon treatment] 2013. Tropidocarpum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=47412, accessed on Aug 20 2014

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click for enlargement Tropidocarpum gracile
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1982 Robert E. Preston, Ph.D.

Geographic subdivisions indicated for the distribution of Tropidocarpum gracile Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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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.