Agalinis tenuifolia
Agalinis tenella
gérardie à feuilles ténues, slender-leaf agalinis, slender-leaf false foxglove
delicate false foxglove
simple or branched, 10–100 cm;
branches ascending to spreading, quadrangular, sharply ridged to winged distally, glabrate, sometimes scabrous.
simple or branched, 25–90 cm;
branches laxly and widely spreading, subterete proximally, quadrangular-ridged distally, glabrous or scabridulous.
spreading, sometimes arching, ascending, or reflexed;
blade narrowly linear to linear-lanceolate, 10–70 x 0.3–6 mm, not fleshy, margins entire, adaxial surface scabrous;
axillary fascicles absent or shorter than subtending leaves.
spreading;
blade filiform to linear-filiform, 6–25 x 0.2–1(–1.5) mm, margins entire, often siliceous, abaxial midvein sometimes scabridulous, adaxial surface finely scabrous;
axillary fascicles absent.
racemes, elongate, flowers 2 per node;
bracts shorter than, or longer than, or both shorter and longer than, pedicels.
racemes, flowers 2 per node, sometimes with branches bearing pseudoterminal flowers;
bracts shorter than pedicels.
ascending-spreading, some upcurved distally, 6–25 mm, glabrous.
spreading, (7–)10–25(–30) mm, glabrous.
calyx obconic to hemispheric, tube 2.3–5.5 mm, glabrous, lobes subulate to triangular-subulate, 0.3–2 mm;
corolla pink to rose purple, with 2 yellow lines and red spots in abaxial throat, 7–23 mm, throat pilose externally and glabrous within across bases and sinus of adaxial lobes, lobes: abaxial projected or spreading, adaxial projected over distal anthers, 2–8 mm, abaxial pilose externally, adaxial glabrous externally or pilose proximally;
proximal anthers perpendicular or oblique to filaments, distal perpendicular and vertical to filaments, pollen sacs 1–4 mm;
style exserted, 6.7–18 mm.
calyx obconic to hemispheric, tube 2–3 mm, glabrous, lobes subulate, 0.2–0.4 mm;
corolla pink to rosy pink, with 2 yellow lines and red spots in abaxial throat, 10–17 mm, throat pilose externally and villous within across bases and sinus of adaxial lobes, lobes: abaxial spreading, adaxial erect to strongly recurved, 4–7.3 mm, glabrous externally;
proximal anthers parallel to filaments, distal perpendicular to filaments, pollen sacs 1.7–2.5 mm;
style exserted, 7–9 mm.
globular, 4–7 mm.
ovoid-globular, 3–3.7 mm.
tan to brown, 0.5–1.5 mm.
yellow, 0.7–1 mm.
= 28.
= 26.
Agalinis tenuifolia
Agalinis tenella
Populations of Agalinis tenuifolia in New Brunswick, Nova Scotia, and possibly Prince Edward Island in Canada are presumed introduced.
Agalinis tenuifolia is the most widespread and morphologically variable species of the genus in the flora area. Infraspecific taxa have been recognized based on differences in sizes of corollas, calyx lobes, anthers, capsules, and leaves; presence or absence of axillary fascicles; density of indument on stamens; branches ascending versus spreading; and even the stoutness of reticulations on seed coats. These characters intergrade within and among populations and occur in many other combinations in addition to those described, making these infraspecific taxa arbitrary and inconsistent with plants in the field. Pressed specimens of A. tenuifolia are often confused with A. gattingeri from which they differ by lacking a villous band of trichomes within the corolla at the bases of the adaxial corolla lobes present in A. gattingeri; projecting adaxial corolla lobes versus erect to recurved lobes in A. gattingeri; elongate racemes with two flowers per node versus one flower per node, often appearing to terminate branches in A. gattingeri; and low wings of tissue on the branch angles that are absent or less pronounced in A. gattingeri.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Agalinis tenella is common in the panhandle of Florida, adjacent Alabama, and east-central Georgia, and occasional in southern South Carolina. J. B. Pettengill and M. C. Neel (2011) showed A. tenella to be most closely related to the rare A. decemloba. Agalinis tenella is distinguished from A. decemloba (including A. acuta) by the laxly and widely spreading branching habit, generally much shorter calyx lobes, larger corollas, and truncate capsules of A. tenella. Agalinis tenella can also be confused with A. obtusifolia; A. tenella has well-formed racemes usually with two flowers per node, while the inflorescence of A. obtusifolia is paniculate and has short, slender branches each appearing to terminate in a pedicelled flower subtended by tiny bractlets.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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