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Thaspium barbinode

Thaspium barbinode (Michx.) Nutt.  
Family: Apiaceae
Hairy-Joint Meadow-Parsnip
[Smyrnium barbinode Muhl., moreThaspium barbinode var. angustifolium J.M. Coult. & Rose]
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Paul Rothrock
  • Gleason & Cronquist
  • Indiana Flora
  • Resources
Vascular plants of NE US and adjacent Canada
Stem to 1 m, branched above, pubescent around the upper nodes with minute stiffish hairs; basal and principal cauline lvs twice pinnate or ternate- pinnate, the lfls ovate to lanceolate, serrate to incised; umbels commonly 3-6 cm wide, at anthesis scarcely surpassing the lvs, the 8-16 rays subequal; fls pale yellow or cream-color; bractlets linear, acute, 1-4 mm; fr glabrous, ellipsoid, 4-6 mm, the lateral and some of the dorsal and intermediate ribs broadly winged; 2n=22. Woods and prairies; N.Y. and Ont. to Minn., s. to Fla. and Okla. May, June.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
From Flora of Indiana (1940) by Charles C. Deam
Frequent throughout the state in rich woods and infrequent in prairie habitats, preferring alluvial soil along streams and wooded slopes. This species is extremely variable in all of its parts and the form with narrow leaf-segments has been named. Plants that grow in rich soil in shady places usually have the leaf-segments large and ovate while plants that grow in poor soil and prairie habitats usually have the leaf-segments narrow. The nodes, peduncles, umbels, and furrows of the fruit are generally more or less pubescent with short, stout, colorless hairs (sometimes only granulose). The nodes are always pubescent and rarely can a plant be found that has the inflorescence nearly glabrous. Sometimes the pubescence is conspicuous in the inflorescence and on the veins of the lower surface of the leaflets. The flowers are sometimes cream-colored, and the fruit varies in size and pubescence. I am not able to correlate the pubescence with any other character and have concluded that we have a polymorphic species whose variations are due to soil and exposure.

......

Indiana Coefficient of Conservatism: C = 7

Wetland Indicator Status: FACU

Diagnostic Traits: perennial to ca. 1 m tall; leaves 2-3 ternate, leaflets coarsely toothed or cleft; nodes distinctly hispidulous; umbel bracts lacking or minute; flowers yellow; fruits oblong, ca. 6 mm long, with prominent winged ribs.

Deam was unable to discern that his collections consisted of two species: T. barbinode and T. chapmanii. As noted in the Michigan Flora by Voss and Reznicek, T. chapmanii is generally "taller, with more dissected and more pubescent leaves, pale yellow-cream flowers, and fruits that are granular-pubescent between the wings." Thaspium barbinode, a more southern and eastern species, "is generally a shorter plant with less dissected and less pubescent leaves, bright yellow flowers, and fruits that are usually nearly smooth between the wings." Thaspium barbinode is the rarer of the two species in Indiana.

Thaspium barbinode
Open Interactive Map
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Paul Rothrock
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Paul Rothrock
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Paul Rothrock
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University of Florida Herbarium
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University of Florida Herbarium
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