. Plant species of concern and plant associations of Powder River county, Montana . Figure 26. Illustration of Physaria brassicoides petals that are 9 to 12 mm long and 4 separate sepals. The ascending, inflated fmits are 1 to 2 cm long, at least as wide, and flattened on top. They are 2-lobed witli the locules (lobes) more deeply defined above than below. There are 2 ovules in each of the locules, attached at the top of the replum (suture between tlie two locules), and tlie replum has a linear outline. The style is 6 to 9 mm long. Flowering in May-early June, fruiting in June-July. There are
. Plant species of concern and plant associations of Powder River county, Montana . Figure 26. Illustration of Physaria brassicoides petals that are 9 to 12 mm long and 4 separate sepals. The ascending, inflated fmits are 1 to 2 cm long, at least as wide, and flattened on top. They are 2-lobed witli the locules (lobes) more deeply defined above than below. There are 2 ovules in each of the locules, attached at the top of the replum (suture between tlie two locules), and tlie replum has a linear outline. The style is 6 to 9 mm long. Flowering in May-early June, fruiting in June-July. There are many similar-appearing P/fv^^/vf/. Physaria didymocarpa is reported fiom sontheastem Montana. It differs from Physaria brassicoides having a replum that is obovate to elliptic; ovules usually 4 per locule, and funicles not restiicted to apex. A technical manual and hand lens or microscope will be required for positive identification. Distribution: This species is a regional endemic of southwestern North Dakota, soudieastem Montana, eastern Wyoming and western Nebraska. In Montana, it is known fiom three counties to date, including Carter, Powdei' River and Peti'oleum counties. It was first documented in the state in 1994 (Heidel and Dueholm 1995, Heidel 1996). Habitat: Double bladderpod is restricted to sandy or stony soil of open grassland slopes on the plains. It grows where tlie vegetation is sparse, often on steep slopes where tlie slope is unstable and there is little or no profile development. Most settings represent sandy or tliin sandy ecological sites. Associated species may include bluebunch wheatgrass {Pseudoroegneria spicatum), goldenweed {Heterotlieca rillosa). indian ricegrass (Oiyzopsis hymenoides), skunkbush (Rhus f^romatica), wild begonia {Runtex \ei\osns) and yucca {Yucca glattca). Comments: The species is vulnerable to exotic species competition. Avoid seeding sweet clover (Melihtfis spp.) in the area. It is also potentially impacted by road widening, mainte
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