A taxonomic revision of Bromus (Poaceae: Pooideae: Bromeae) in México and Central America
Bibliographic record
Abstract
A taxonomic treatment of Bromus in México and Central America is presented. Twenty-two species and one variety are recognized in the region. Twelve of these species are native, and ten are adventive and introduced. Bromus section Mexibromus is newly described, representing a distinct lineage in molecular studies of the genus. It includes two species endemic to México (B. attenuatus, B. densus) and one endemic to México and Guatemala (B. dolichocarpus), distinguished from species in other Bromus sections by their 3(–5)-nerved lemmas. Bromus pinetorum is a poorly understood species of Bromus sect. Bromopsis endemic to Coahuila. Taxa that have been variously treated in the past are discussed in detail. Bromus mucroglumis and B. thysanoglottis are treated as synonyms of B. richardsonii, and B. meyeri is treated as a synonym of B. anomalus. Two varieties are recognized in B. carinatus, B. carinatus var. carinatus and B. carinatus var. marginatus. Lectotypes are designated for the names B. carinatus var. californicus, B. hookeri var. schlechtendalii, B. trinii, B. trinii var. pallidiflorus and B. trinii var. stricta. A second-step neotype is designated for B. rigidus. Keys for determining the species in English and Spanish, descriptions, synonymies, illustrations, distribution maps, comments and lists of all specimens examined are provided for each species.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".