Cirsium longistylum

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Cirsium longistylum is endemic to the Big Belt, Castle, Elkhorn, and Little Belt ranges of west-central Montana. It is highly variable, and several authors have suggested that it has introgressed with one or more other species (R. J. Moore and C. Frankton 1963; J. M. Poole and B. L. Heidel 1993; S. J. Brunsfeld and C. T. Baldwin, unpubl.). It is closely related to C. hookerianum, and the two probably share a common ancestry or a history of hybrid interactions dating back to the Pleistocene. Cirsium longistylum is perhaps also affected by modern or historic introgression involving C. scariosum var. scariosum.

Facts about "Cirsium longistylum"
apex arrangement or shapelinear +
apex orientationascending +
apex relieferose +
apex sizeslender + and expanded +
array architectureracemiform + and spiciform +
base colorationnon-pigmented +
base orientationappressed +
base positiondistal +
base shapeshort-decurrent +
base sizereduced +
base widthnarrower than the proximal +
blade shapelinear +, oblong + and elliptic +
bract architectureleafy +
bract arrangement or habitclustered +
branch height or lengthshort +
branch orientationascending +
chromosome count34 +
collar variabilitydifferentiated +
corolla colorationwhite + and ochroleucous +
cypsela colorationbrown +
face architecturewinged-petiolate + and sessile +
face arrangementdistributed +
face colorationgreen +
face countpresent +
face external texturesubglabrous +, gray-or-white-tomentose +, villous +, tomentose +, glabrous + and glabrate +
face otherprincipal +
face positionadaxial +, basal + and cauline +
face sizereduced +
flowering timesummerjun +, jul + and aug +
habitatmoist soil +, roadsides +, meadows + and forest edges and openings +
habitat moisturewet +
head orientationerect +
involucre colorationgreen +
involucre external texturevillous + and arachnoid +
involucre shapeovoid +
lobe shapelance-oblong +, triangular +, spinulose +, spiny-dentate + and lobed +
margin shapeflat +, undulate +, subentire +, dentate + and pinnatifid +
phyllary shapelanceolate +
phyllary sizesubequal +
ridge widthnarrow +
stem architecturesimple +, short-branched + and branched +
stem count1 + and several +
stem external texturevillous +
stem orientationerect + and ascending +
tip positionexserted +
trichome architecturejointed + and septate +
trichome external texturefelted + and arachnoid +
vein sizetaxonname-major +
whole organism architecturetaprooted +
whole organism life styleperennial +
whole organism reproductionmonocarpic +