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.
Common Name: MUSTARD Habit: Annual to perennial herb; hairs simple or 0. Stem: erect, simple or branched, glabrous or hairy distally. Leaf: basal petioled, generally rosetted, dentate to pinnately lobed; cauline petioled or sessile, bases lobed or not. Inflorescence: terminal. Flower: sepals erect to ascending, base generally not sac-like; petals generally yellow, clawed. Fruit: silique, linear, dehiscent, segmented, round or 4-sided to flat parallel to septum; valves 1-veined, glabrous; terminal segment conic to cylindric, 0--3-seeded; stigma entire to +- 2-lobed. Seed: (4)10--50, in 1 row, spheric to ovoid. Etymology: (Latin: cabbage) Note:Brassica including most important vegetable, seed-oil, condiment crops in Brassicaceae. eFlora Treatment Author: Ihsan A. Al-Shehbaz
Brassica rapa L.
NATURALIZED Habit: Annual, biennial, erect; hairs 0 or few. Stem: 3--10 dm, simple or branched. Leaf: basal pinnately lobed, lateral lobes 2--4(6) pairs, terminal lobe obovate, wavy-dentate; middle, distal cauline sessile, base lobed, generally clasping. Flower: overtopping buds; sepals (3)4--6.5(8) mm; petals 6--11(13) mm, (2.5)3--6(7) mm wide. Fruit: ascending to +- spreading, (2)3--8(11) cm, 2--4(5) mm wide; terminal segment 8--22 mm; pedicel ascending to spreading, (0.5)1--2.5(3) cm. Seed: 1.1--2 mm wide, spheric. Chromosomes: 2n=20. Ecology: Disturbed areas; Elevation: < 1500 m. Bioregional Distribution: CA-FP, SNE; Distribution Outside California: widespread North America, native to Europe. Flowering Time: Jan--May Synonyms: Brassica campestris L. Jepson eFlora Author: Ihsan A. Al-Shehbaz Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) View the CDFA Pest Rating page for Brassica rapa Weed listed by Cal-IPC Previous taxon: Brassica oleracea Next taxon: Brassica tournefortii
Citation for this treatment: Ihsan A. Al-Shehbaz 2012, Brassica rapa, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=16081, accessed on December 03, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on December 03, 2024.
Geographic subdivisions for Brassica rapa:
CA-FP, SNE
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(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 occurrence).
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Duplicates counted once; synonyms included.
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Blue line denotes eFlora flowering time (fruiting time in some monocot genera).