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In northeastern Utah the most common associates of flaxleaf plainsmustard in a Utah juniper-Colorado pinyon/low sagebrush (J. osteosperma-P. edulis/A. arbuscula) community were broom snakeweed (Gutierrezia sarothrae), big sagebrush (A. tridentata), bottlebrush squirreltail (Elymus elymoides), prickly-pear (Opuntia spp.), and grassy rockgoldenrod (Petradoria pumila). Flaxleaf plainsmustard was 1 of the most common forbs in the community [9]. Associates in a true mountain-mahogany (Cercocarpus montanus) community in the Uintah Basin, Utah, were nodding buckwheat (Eriogonum cernuum), Salina wildrye (Elymus salinus), and Fremont goosefoot (Chenopodium fremontii) [27].
On the Snake River Plain of southern Idaho, flaxleaf plainsmustard was the most important forb in cheatgrass (Bromus tectorum)-bottlebrush squirreltail-thickspike wheatgrass in (E. lanceolatus) mountain grassland. Other important forbs included bastard toadflax (Comandra umbellata) and nodding buckwheat [46].Flaxleaf plainsmustard is a native forb. Stems are 7.9 to 20 inches (20-50 cm) tall, arising from a simple or branched caudex. Leaves are linear, pinnate at the stem base and becoming entire up the stem. The inflorescence is a raceme of perfect flowers. Fruits are siliques measuring 0.04 inch wide and 0.4 to 2.4 inches long (1 mm × 3-6 cm) [38,47,67]. The unwinged seeds are about 1.5 mm in diameter [34]. Flaxleaf plainsmustard has deep, long, highly branched rhizomes [44,67] and highly branched roots [44]. As of this writing (2003), average and maximum life spans of this perennial have not been documented in the literature.
RAUNKIAER [55] LIFE FORM:Breeding system: Mustards (Brassicaceae) are cross-pollinated. Selfing also occurs [32].
Pollination is insect-mediated [32].
Seed production: No information
Seed dispersal: Flaxleaf plainsmustard seed may disperse only short distances unless moved by machinery or other anthropogenic disturbance. The seed lacks appendages for dispersal and unlike some mustards, the seed coat is nonmucilagious [34]; thus, seeds do not disperse by sticking to fur or feathers.
Seed banking: Many mustard species build a long-term seed bank [3,5,20], and it is likely that flaxleaf plainsmustard does as well. Further research is needed on regeneration strategies of this native mustard. A thorough description of flaxleaf plainsmustard's life history is incomplete without knowledge of seed bank dynamics including spatial variability of the seed bank and temporal variability in the number of seeds in the soil. Knowledge of flaxleaf plainsmustard seed bank dynamics can then be related to disturbances such as fire [53].
Germination: Little is known of germination requirements for flaxleaf plainsmustard, and research is needed in this area. Since flaxleaf plainsmustard lacks a mucilaginous seedcoat [34], its germinating seed is probably more susceptible to desiccation than seed of mustard species with sticky, protective coatings on their seedcoats [74].
Seedling establishment/growth: No information
Asexual regeneration: Flaxleaf plainsmustard sprouts from the caudex and underground rhizomes after top-kill by fire or other disturbance [51,72]. The relative importance of seed vs. sprouting regeneration after fire or other disturbance is unknown, and further research is needed in this area.
SITE CHARACTERISTICS:A few elevational ranges have been reported for flaxleaf plainsmustard:
Arizona | 2,500-9,500 ft (760-2,900 m) [18] |
Colorado | 4,500-8,500 ft (1,400-2,600 m) [30] |
Nevada | 6,000-9,500 ft (1,800-2,900 m) [36] |
New Mexico | 5,000-8,000 ft (1,500-2,400 m) [47] |
Utah | 3,660-8,825 ft (1,115-2,690 m) [26,67] |
New Mexico | probably May-July [47] |
Nevada | May-June [36] |
Pacific Northwest | May-June [33] |
Fire regimes: Having evolved in both fire-adapted ecosystems and in ecosystems where fire was historically infrequent, flaxleaf plainsmustard is able to persist under many fire regimes, varying from frequent surface fire (i.e., ponderosa pine) to mixed-severity fire (pinyon-juniper) and infrequent, stand-replacement fire (creosotebush (Larrea tridentata)).
Sagebrush steppe: Historic fire regimes are variable in big sagebrush/bunchgrass ecosystems, with fire return intervals ranging between 10 and 70 years [8,16,49,50,65,76]. Historic fire seasons in the sagebrush steppe occurred between July and September [1,4,40,75], with the middle to end of August being the period of the most extreme fire conditions [15]. The introduction and increasing dominance of cheatgrass has changed the seasonal occurrence and increased the frequency and size of wildfires in these ecosystems, thus altering successional patterns [12,52,56,68].
Salt-desert shrubland: Fires were historically infrequent in salt-desert shrublands. Desert shrublands usually lack sufficient fine fuels to carry fire, with widely spaced shrubs and bunchgrasses and relatively bare interspaces [13,14,69,77]. Historic fire return intervals in these ecosystems (dominated by saltbush (Atriplex spp.), black greasewood (Sarcobatus vermiculatus), creosotebush, and blackbrush (Coleogyne ramosissima)) are thought to average between 35 and 100 years or more [50].
Pinyon-juniper woodlands are characterized by a large number of diverse habitat types that vary in tree and herbaceous species composition and density, and fire regime characteristics. Fire severity and frequency vary, depending largely on site productivity. On less productive sites with discontinuous grass cover, fires were probably infrequent, small, and patchy [50]. Fire intervals were probably greater than 100 years in these areas, but did fire occur more frequently under extreme conditions [26]. On more productive sites where grass cover was more continuous, fire intervals may have been 10 years or less, maintaining more open stands. Historical fire regimes in dense stands were a mixture of surface and crown fires, with surface fires at intervals of 10-50 years and crown fires at intervals of 200-300 years or longer. Fire susceptibility in pinyon-juniper communities also depends on the stage of stand development. In young open stands, shrubs and herbaceous cover may be sufficient to carry fire, but as the stand approaches crown closure, herbaceous cover declines and eventually becomes too sparse to carry fire [50].
The following table provides fire return intervals for plant communities and ecosystems where flaxleaf plainsmustard may be important. Find further fire regime information for the plant communities in which this species may occur by entering the species name in the FEIS home page under "Find Fire Regimes".
Community or Ecosystem | Dominant Species | Fire Return Interval Range (years) |
silver sagebrush steppe | Artemisia cana | 5-45 [31,54,71] |
sagebrush steppe | A. tridentata/Pseudoroegneria spicata | 20-70 [50] |
basin big sagebrush | A. tridentata var. tridentata | 12-43 [58] |
mountain big sagebrush | A. tridentata var. vaseyana | 15-40 [8,16,49] |
Wyoming big sagebrush | A. tridentata var. wyomingensis | 10-70 (40**) [65,76] |
saltbush-greasewood | Atriplex confertifolia-Sarcobatus vermiculatus | < 35 to < 100 |
desert grasslands | Bouteloua eriopoda and/or Pleuraphis mutica | 5-100 [50] |
plains grasslands | Bouteloua spp. | < 35 [50,71] |
blue grama-needle-and-thread grass-western wheatgrass | B. gracilis-Hesperostipa comata-Pascopyrum smithii | < 35 [50,57,71] |
blue grama-buffalo grass | B. gracilis-Buchloe dactyloides | < 35 [50,71] |
grama-galleta steppe | Bouteloua gracilis-Pleuraphis jamesii | < 35 to < 100 |
blue grama-tobosa prairie | B. gracilis-P. mutica | < 35 to < 100 [50] |
cheatgrass | Bromus tectorum | < 10 [52,70] |
blackbrush | Coleogyne ramosissima | < 35 to < 100 |
western juniper | Juniperus occidentalis | 20-70 |
Rocky Mountain juniper | J. scopulorum | < 35 |
creosotebush | Larrea tridentata | < 35 to < 100 [50] |
wheatgrass plains grasslands | Pascopyrum smithii | < 5-47+ [50,54,71] |
pinyon-juniper | Pinus-Juniperus spp. | < 35 [50] |
Colorado pinyon | P. edulis | 10-400+ [22,26,39,50] |
Pacific ponderosa pine* | P. ponderosa var. ponderosa | 1-47 [7] |
interior ponderosa pine* | P. ponderosa var. scopulorum | 2-30 [7,10,45] |
Arizona pine | P. ponderosa var. arizonica | 2-15 [10,17,59] |
quaking aspen (west of the Great Plains) | Populus tremuloides | 7-120 [7,28,48] |
mountain grasslands | Pseudoroegneria spicata | 3-40 (10**) [6,7] |
In a Utah juniper-Colorado pinyon community in the Green River corridor of northeastern Utah, flaxleaf plainsmustard showed 8% frequency on an 80-year-old burn that was disturbed by frequent bighorn sheep grazing. Bighorn sheep appeared to favor the burn, which still retained a relatively open canopy, over closed-canopy areas that had not experienced fire for 150+ years. Flaxleaf plainsmustard did not occur on closed-canopy plots [25].
FIRE MANAGEMENT CONSIDERATIONS:Palatability/nutritional value: No information is available on this topic.
Cover value: No information is available on this topic.
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