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| − | --><span class="statement" id="st-d0_s0" data-properties="root coloration;root width;root architecture"><b>Roots </b>brown, thick, tuberous.</span> <span class="statement" id="st-d0_s1" data-properties="stem growth form or orientation;stem some measurement;stem pubescence"><b>Stems </b>decumbent, 20-40 cm, glabrous.</span> <span class="statement" id="st-d0_s2" data-properties="distal cauline leaf architecture"><b>Leaves:</b> distal cauline long-petiolate.</span> <span class="statement" id="st-d0_s3" data-properties="leaf-blade architecture"><b>Leaf-</b>blade 1-3×-ternately compound;</span> <span class="statement" id="st-d0_s4" data-properties="leaflet shape;leaflet shape;leaflet shape;leaflet shape;leaflet shape;leaflet shape;largest leaflet width;lobe margin shape;surface pubescence">leaflets ovate to obovate to reniform or orbiculate, 3- (or more) -lobed, largest leaflets less than 15 mm wide, lobe margins crenate, surfaces glabrous.</span> <span class="statement" id="st-d0_s5" data-properties="inflorescence position or structure subtype;raceme quantity;raceme architecture"><b>Inflorescences </b>terminal, racemes, few flowered.</span> <span class="statement" id="st-d0_s6" data-properties="sepal coloration;sepal shape;sepal shape;sepal atypical some measurement;sepal some measurement"><b>Flowers:</b> sepals whitish, ovate or elliptic, 0.9-2.8 (-3) mm;</span> <span class="statement" id="st-d0_s7" data-properties="filament coloration;filament some measurement">filaments colored, 2-3 mm;</span> <span class="statement" id="st-d0_s8" data-properties="anther some measurement;anther shape;tip some measurement">anthers 1.8-2.3 mm, mucronate, tip 0.1-0.4 mm;</span> <span class="statement" id="st-d0_s9" data-properties="">stigma color unknown.</span> <span class="statement" id="st-d0_s10" data-properties="achene quantity;achene orientation;achene architecture"><b>Achenes </b>few, not reflexed, nearly sessile;</span> <span class="statement" id="st-d0_s11" data-properties="stipe some measurement">stipe 0.1-0.3 mm;</span> <span class="statement" id="st-d0_s12" data-properties="body shape;body shape;body shape;body length;body width;body pubescence;vein quantity;vein architecture or coloration or relief">body ellipsoid to oblong, 3.5-4.5 × 1.5-2 mm, glabrous, veins 10-12, not anastomosing-reticulate;</span> <span class="statement" id="st-d0_s13" data-properties="beak atypical some measurement;beak some measurement">beak (1.3-) 2.3-3 mm.</span><!-- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Roots </b>brown, thick, tuberous. <b>Stems</b> decumbent, 20-40 cm, glabrous. <b>Leaves</b>: distal cauline long-petiolate. <b>Leaf</b> blade 1-3×-ternately compound; leaflets ovate to obovate to reniform or orbiculate, 3-(or more)-lobed, largest leaflets less than 15 mm wide, lobe margins crenate, surfaces glabrous. <b>Inflorescences</b> terminal, racemes, few flowered. <b>Flowers</b>: sepals whitish, ovate or elliptic, 0.9-2.8(-3) mm; filaments colored, 2-3 mm; anthers 1.8-2.3 mm, mucronate, tip 0.1-0.4 mm; stigma color unknown. <b>Achenes</b> few, not reflexed, nearly sessile; stipe 0.1-0.3 mm; body ellipsoid to oblong, 3.5-4.5 × 1.5-2 mm, glabrous, veins 10-12, not anastomosing-reticulate; beak (1.3-)2.3-3 mm.</span><!-- |
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| | |publication year=1944 | | |publication year=1944 |
| | |special status=Conservation concern;Endemic | | |special status=Conservation concern;Endemic |
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V3/V3_907.xml | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V3/V3_907.xml |
| | |genus=Thalictrum | | |genus=Thalictrum |
| | |section=Thalictrum sect. Heterogamia | | |section=Thalictrum sect. Heterogamia |
| | |species=Thalictrum arkansanum | | |species=Thalictrum arkansanum |
| − | |achene architecture=sessile
| |
| − | |achene orientation=not reflexed
| |
| − | |achene quantity=few
| |
| − | |anther shape=mucronate
| |
| − | |anther some measurement=1.8mm;2.3mm
| |
| − | |beak atypical some measurement=1.3mm;2.3mm
| |
| − | |beak some measurement=2.3mm;3mm
| |
| − | |body length=3.5mm;4.5mm
| |
| − | |body pubescence=glabrous
| |
| − | |body shape=ellipsoid;oblong
| |
| − | |body width=1.5mm;2mm
| |
| − | |distal cauline leaf architecture=long-petiolate
| |
| − | |filament coloration=colored
| |
| − | |filament some measurement=2mm;3mm
| |
| − | |inflorescence position or structure subtype=terminal
| |
| − | |largest leaflet width=0mm;15mm
| |
| − | |leaf-blade architecture=compound
| |
| − | |leaflet shape=3-lobed;ovate;obovate
| |
| − | |lobe margin shape=crenate
| |
| − | |raceme architecture=flowered
| |
| − | |raceme quantity=few
| |
| − | |root architecture=tuberous
| |
| − | |root coloration=brown
| |
| − | |root width=thick
| |
| − | |sepal atypical some measurement=2.8mm;3mm
| |
| − | |sepal coloration=whitish
| |
| − | |sepal shape=elliptic;ovate
| |
| − | |sepal some measurement=0.9mm;2.8mm
| |
| − | |stem growth form or orientation=decumbent
| |
| − | |stem pubescence=glabrous
| |
| − | |stem some measurement=20cm;40cm
| |
| − | |stipe some measurement=0.1mm;0.3mm
| |
| − | |surface pubescence=glabrous
| |
| − | |tip some measurement=0.1mm;0.4mm
| |
| − | |vein architecture or coloration or relief=not anastomosing-reticulate
| |
| − | |vein quantity=10;12
| |
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| | -->[[Category:Treatment]][[Category:Thalictrum sect. Heterogamia]] | | -->[[Category:Treatment]][[Category:Thalictrum sect. Heterogamia]] |
Roots brown, thick, tuberous. Stems decumbent, 20-40 cm, glabrous. Leaves: distal cauline long-petiolate. Leaf blade 1-3×-ternately compound; leaflets ovate to obovate to reniform or orbiculate, 3-(or more)-lobed, largest leaflets less than 15 mm wide, lobe margins crenate, surfaces glabrous. Inflorescences terminal, racemes, few flowered. Flowers: sepals whitish, ovate or elliptic, 0.9-2.8(-3) mm; filaments colored, 2-3 mm; anthers 1.8-2.3 mm, mucronate, tip 0.1-0.4 mm; stigma color unknown. Achenes few, not reflexed, nearly sessile; stipe 0.1-0.3 mm; body ellipsoid to oblong, 3.5-4.5 × 1.5-2 mm, glabrous, veins 10-12, not anastomosing-reticulate; beak (1.3-)2.3-3 mm.
Phenology: Flowering early spring (Mar–Apr).
Habitat: Wet bottomland forest, sometimes upland woods
Elevation: 20-150 m
Distribution
Ark., Okla., Tex.
Discussion
Of conservation concern.
Poorly known, Thalictrum arkansanum is closely related to T. texanum and T. debile; it possibly should be considered as a variety of the latter.
Selected References
None.
