Overview

Distribution

Localities documented in Tropicos sources

Bromus arizonicus (Shear) Stebbins:
Mexico (Mesoamerica)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO 63110 USA

Source: Missouri Botanical Garden

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National Distribution

Mexico

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Source: NatureServe

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Global Range: Kartesz (1999) indicates that this species is native within his geographic scope and occurs in Arizona, California, Nevada, and Texas.

Hickman (1993) and Kearney and Peebles (1960) say that this species is also established in Baja California.

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Physical Description

Morphology

Physical Description

Annuals, Terrestrial, not aquatic, Stems nodes swollen or brittle, Stems erect or ascending, Stems caespitose, tufted, or clustered, Stems terete, round in cross section, or polygonal, Stem internodes hollow, Stems with inflorescence less than 1 m tall, Stems, culms, or scapes exceeding basal leaves, Leaves mostly basal, below middle of stem, Leaves mostly cauline, Leaves conspic uously 2-ranked, distichous, Leaves sheathing at base, Leaf sheath mostly closed, Leaf sheath hairy, hispid or prickly, Leaf sheath and blade differentiated, Leaf blades linear, Leaf blades 2-10 mm wide, Leaf blades mostly flat, Leaf blades mostly glabrous, Leaf blades more or less hairy, Ligule present, Ligule an unfringed eciliate membrane, Inflorescence terminal, Inflorescence an open panicle, openly paniculate, branches spreading, Inflorescence solitary, with 1 spike, fascicle, glomerule, head, or cluster per stem or culm, Inflorescence with 2-10 branches, Inflorescence branches more than 10 to numerous, Flowers bisexual, Spikelets pedicellate, Spikelets laterally compressed, Spikelet 3-10 mm wide, Spikelets with 3-7 florets, Spikelets solitary at rachis nodes, Spikelets all alike and fertille, Spikelets bisexual, Spikelets disarticulating above the glumes, glumes persistent, Spikelets disarticulating beneath or between the florets, Rachilla or pedicel glabrous, Glumes p resent, empty bracts, Glumes 2 clearly present, Glumes equal or subequal, Glumes distinctly unequal, Glumes shorter than adjacent lemma, Glumes 3 nerved, Lemmas thin, chartaceous, hyaline, cartilaginous, or membranous, Lemma 5-7 nerved, Lemma glabrous, Lemma body or surface hairy, Lemma apex dentate, 2-fid, Lemma distinctly awned, more than 2-3 mm, Lemma with 1 awn, Lemma awn less than 1 cm long, Lemma awn 1-2 cm long, Lemma awn subapical or dorsal, Lemma awns straight or curved to base, Lemma awn once geniculate, bent once, Lemma margins thin, lying flat, Lemma straight, Palea present, well developed, Palea membranous, hyaline, Palea shorter than lemma, Palea 2 nerved or 2 keeled, Palea keels winged, scabrous, or ciliate, Stamens 3, Styles 2-fid, deeply 2-branched, Stigmas 2, Fruit - caryopsis, Caryopsis ellipsoid, longitudinally grooved, hilum long-linear, Caryopsis hairy at apex.
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Dr. David Bogler

Source: USDA NRCS PLANTS Database

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Type Information

Holotype for Bromus carinatus var. arizonicus Shear
Catalog Number: US 81568
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): C. G. Pringle
Year Collected: 1884
Locality: Santa Cruz Valley, Tucson., Pima, Arizona, United States, North America
  • Holotype: Shear, C. L. 1900. U.S.D.A. Div. Agrostol. Bull. 23: 62.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Conservation

Conservation Status

National NatureServe Conservation Status

Mexico

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Kartesz (1999) indicates that this species is native within his geographic scope and occurs in Arizona, California, Nevada, and Texas. It occurs in fifteen counties in California, one southern county in Nevada, and eleven counties in Arizona (Kartesz 2003 draft). Hitchcock (1951) mentions that this plant occurs in western Texas, from Arizona to middle California and Baja California. Hickman (1993), Kartesz (1988) and Kearney and Peebles (1960) also state that this species is established in Baja California.

In California, this species inhabits open places, grasslands, and scrub < 1000 m in California, specifically in San Joaquin Valley, southern South Coast Ranges, South Coast, Channel Islands, and Desert (Hickman 1993). Munz (1959) indicates that this species inhabits dry open places, mostly below 2000 ft. in California from Yolo and Fresno counties to San Diego county, to Arizona, lower California, Santa Barbara Islands. It is specifically found in valley grasslands, foothill woodlands, chaparral, coastal sage scrub, and creosote bush scrub. David L. Magney included this plant in his checklist of Ventura County Rare Plants, which was updated on March 1, 2004. It is probably just locally rare there.

In Arizona, it is "almost throughout the state, at moderate elevations" (Kearney and Peebles 1960). Reported in Mohave, Yavapai, Coconino, and Apache counties, mostly below 5000 feet, but sometimes as high as 9500 feet (Dittmann 2004).

In Nevada, it is rare and known from the Riverside Bridge, south end of the Birgin Mountains, Newberry Mountains, below State Highway 77, Clark County. It inhabits hillsides and sandy washes, roadsides and disturbed areas in the deserts, with Juncus and Tessaria, 2300-5000 ft (Kartesz 1988).

In Texas, it is native and occurs only in the western part of the state, in the Trans-Pecos vegetational area (Hatch et al. 1990). Hitchcock (1951) mentions that it occurs on open, mostly arid slopes and valleys, in western Texas.

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Wikipedia

Bromus arizonicus

Bromus arizonicus is a species of brome grass known by the common name Arizona brome.

It is native to the Southwestern United States, California, and Baja California, where it grows in many types of grassy valley and desert habitat. It is an annual grass growing 40 to 90 centimeters tall with an open, branching inflorescence. The spikelets are flat and hairy and have awns up to 1.5 centimeters long.

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