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Montana Field Guides

Large-bracted Scurf-pea - Pediomelum cuspidatum

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Not Documented

Global Rank: G4
State Rank: SNA
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Pediomelum cuspidatum has not been documented in Montana. Since at least 1966 some Botanists have felt that Pediomelum cuspidatum could be in Montana because it is present in neighboring South Dakota (Booth 1966; McGregor et al. 1986). The Flora of Montana (Booth 1966) included Psoralea cuspidata and stated "plains and hills", yet placed no county dot on the Montana map. Its listing was the basis for its inclusion in the Vascular Plants of Montana (Dorn 1984). Recent observations provided to the MTNHP were tracked and determined to likely be the result of observers using a botanical flora written for South Dakota. While there is potential for it to occur in Montana, a conservation status rank is not applicable (SNA) because the plant has not been documented in our State.
General Description
This description is adapted from the Flora of the Great Plains (McGregor et al. 1986).

PLANTS: Perennials with shortly branching caudex; stems procumbent to ascending (rarely erect), up to 90 cm tall, branched above, sparsely appressed-pubescent.

LEAVES: Leaves palmately 3-5 foliate; leaflets 2.5-6 cm long, 1-3 cm wide.

INFLORESCENCE: A a dense spicate raceme 4-9 cm long. Calyx tube 4-7 mm at anthesis, gibbous at base, longest lobe (=lower lobe) 7-12(-15) mm, tube strigose and glandular. Corolla blue, purple, blue-lavendar or rarely white; banner 12-15 mm long with short basal lobes, claw 4-6 mm long, curved; wings with blades 1 cm long, claws 5-7 mm long, free portion of keel 4-6 mm long. Pods 6-8 cm long, enclosed in enlarged calyx, the curved beak 2 mm long. Seeds 4-5 mm long, olivaceous to dark brown, smooth.

Dry prairies, gravelly hilltops and slopes, stream valleys, chalk bluffs, and badlands (McGregor et al. 1986).

  • Literature Cited AboveLegend:   View Online Publication
    • McGregor, R.L. (coordinator), T.M. Barkley, R.E. Brooks, and E.K. Schofield (eds). 1986. Flora of the Great Plains: Great Plains Flora Association. Lawrence, KS: Univ. Press Kansas. 1392 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Large-bracted Scurf-pea — Pediomelum cuspidatum.  Montana Field Guide.  .  Retrieved on , from