Rhamphospermum nigrum
species of plant
Rhamphospermum nigrum (syns. Mutarda nigra, Brassica nigra, and Sinapis nigra), black mustard, is an annual plant native to cooler regions of North Africa, temperate regions of Europe, and parts of Asia. It is cultivated for its dark-brown-to-black seeds, which are commonly used as a spice.
Description
It is an upright plant, growing to 70 centimetres (28 in) in width and up to 1.2 metres (4 ft) tall in moist, fertile soil. The large stalked leaves are covered with hairs or bristles at the base, with smoother stems.
It blooms in summer (from May onwards in the UK). The flowers have four yellow petals, which are twice as long as the sepals. Each stem has around four flowers at the top, forming a ring around the stem. Later, the plant forms long, beaked seed pods, which contain rounded seeds.
Similar species
Despite their similar common names, black mustard and white mustard (genus Sinapis) are not in the same genus.
The public source identifies “Rhamphospermum nigrum” as species of plant. This brief keeps that definition visible, then builds a research path around Rhamphospermum, nigrum and species.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Rhamphospermum nigrum”, the useful work is to connect “species of plant” to the records capable of establishing context and consequence.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jul 15, 2026. The linked authority identifier is Q381942. None of the 0 selected statements returned an explicit reference.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Rhamphospermum nigrum”, its source revision and the description used here.
- Expand the search: follow Rhamphospermum nigrum primary sources, Rhamphospermum nigrum archive and Rhamphospermum research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Rhamphospermum nigrum”?
- Has classification or technical consensus changed since the cited source?
- Which observation, specimen, dataset or publication supports the account?
Search terms from this dossier
This entry incorporates text from “Rhamphospermum nigrum” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.