Range evidence, related plants, and the genus index supply distribution and comparison routes without changing those facts. The rubens account keeps ecological status, source depth, and seed inclusion in separate channels. Neither the seed row nor a neighboring grass becomes an additional fire finding for the limited pack. The rubens record alone bounds this three-part status, evidence-depth, and seed reading here.
Form
grass
Mature height
~1.2 ft
Water need
low
Rated in
Global; Yavapai County, Arizona
On this lot
1. Fire evidence and conditions
Fire evidence
Mixed evidence — location does not change the cited classification.
Fire-performance conditions
Fire ecology context
Placement evidence
Evidence regions
Global; Yavapai County, Arizona
Maintenance
Typed publication scope: 1 scope across 1 cited fire source
Yavapai County (AZ footprint); partial normalized coverage · 2025-03-14
University of Arizona Cooperative Extension authors Bulletin 34 for Yavapai County. FireApproved publishes 198 exact source owners from its resistant and prone tables and keeps the county boundary visible. County publication scope is regional Arizona context, never statewide scope.
2. Why this plant is relevant here
State distribution
Documented in AZ, CA, HI, ID, MA, MD, MT, NM, NV, NY, OR, SC, TX, UT, VA, WA.
Native range
Introduced / established
16 sourced range or established records. This is not an invasive warning.
USDA hardiness
Only uncertain or inapplicable hardiness rows are cited; no primary zone is projected.
3. Legal, ecological, and broader status
Legal-list status
Seed-list status
1 state noxious-weed seed record; the Place chip matches exact scope.
Reported invasive here
1 ecological invasive report.
Broader regional context
Federal context
How to read this page
The status above is computed from the cited rows below: independent recommendations can support a fire-resistant result, an avoid row can produce keep-away, and disagreement stays visible as conflict. Placement notes preserve each source’s own scheme rather than translating unlike rules into one scale. This is evidence about a plant, not permission to plant it in every part of the defensible space; Zone 0 remains noncombustible.
Native and introduced range evidence
These are exact U.S. botanical-area records from the cited range source. Native and
introduced describe biogeographic relationship, not fire performance or planting approval.
Doubtful and extinct rows stay visible but do not count as current presence.
The lossless worldwide derivative is retained once in the research corpus; object pages repeat only exact U.S. areas needed by the local lens. The JSON twin carries the same page assertions.
Plant hardiness evidence
These values describe the plant source. Your ZIP zone comes from the separate 2023 USDA
Plant Hardiness Zone Map. Whole-zone values stay whole-zone, and a single unresolved value
is not treated as a tolerance range. Different source boundaries stay separate: overlapping
statements are compared independently, while only ranges with no shared zone are called a conflict.
Source location: PlantCharacteristics record 21051, Temperature, Minimum (°F).
Not used for comparison: USDA PLANTS lists duration as Annual; its minimum-temperature definition does not apply to summer annuals.
The evidence
Grouped by what each source concluded. Primary evidence rated the plant itself
(a lab, field program, or original curation); corroboration compiled or
republished another source's rating and resolves to its root lineage.
Listed as Red brome — Bromus rubens. The bulletin says fire-resistant plants tend to resist ignition when irrigated and maintained, while fire-prone plants may ignite readily and burn intensely.
Listed without a rating (1)Corroboration (1 rows from 1 source)
FLAMITS record 3907; Combustibility measurement; plant part stems; fuel dead; predrying yes; device calorimeter; site Gillon1997-1; sampling june to september. Primary study Gillon1997: Gillon, D., Hernando, C., Valette, J.-C., & Joffre, R. (1997). Fast estimation of the calorific values of forest fuels by near infrared-reflectance spectroscopy. Canadian Journal of Forest Research, 27, 760-765.
