Schwalbea americana L.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Scrophulariaceae
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Scientific Name
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Description
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Species Description - Finely hairy perennial, 3–6 dm, simple; lvs alternate, sessile, lanceolate, 2–5 cm, acute, entire, 3-nerved, the upper progressively smaller; fls solitary in the uppermost axils on short pedicels, forming a leafy spike-like raceme; bractlets 1 cm; cal 2 cm; cor 3–3.5 cm, yellowish on the tube, purplish distally; fr 10–12 mm, the fruiting cal with 12 strongly projecting ribs; 2n=32, 36. Moist sandy soil; s. N. Engl. to Fla. and Tex., and locally in Tenn. and e. Ky.; very rare. June, July. (S. australis)