Agalinis tenuifolia
Agalinis navasotensis
gérardie à feuilles ténues, slender-leaf agalinis, slender-leaf false foxglove
Navasota false foxglove
simple or branched, 10–100 cm;
branches ascending to spreading, quadrangular, sharply ridged to winged distally, glabrate, sometimes scabrous.
branched, 25–80 cm;
branches spreading-ascending, nearly terete proximally, obtusely quadrangular-ridged distally, glabrous or scabridulous distally.
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.
proximal to mid reflexed or recurved, distal spreading;
blade filiform, (11–)17–30(–40) x 0.5–1.2 mm, not fleshy, margins entire, siliceous, abaxial midvein scabridulous, adaxial surface scabridulous;
axillary fascicles absent.
racemes, elongate, flowers 2 per node;
bracts shorter than, or longer than, or both shorter and longer than, pedicels.
racemiform-paniculate, flowers 1 or 2 per node;
bracts both longer and shorter than, or shorter than, pedicels.
ascending-spreading, some upcurved distally, 6–25 mm, glabrous.
ascending-spreading, (2–)6–25 mm, scabridulous proximally or 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 funnelform-obconic, tube 2.2–4.6 mm, glabrous, lobes triangular-subulate to subulate, 0.5–1.5 mm;
corolla pink to rose, with 2 yellow lines and red spots in abaxial throat, 15–24 mm, throat pilose externally and glabrous within across bases of adaxial lobes, sparsely villous at sinus, lobes spreading, 5–7 mm, equal, glabrous externally;
proximal anthers parallel to filaments, distal perpendicular to filaments, pollen sacs 2–3.2 mm;
style exserted, 11–15 mm.
globular, 4–7 mm.
ovoid to obovoid-oblong, (4–)6–7 mm.
tan to brown, 0.5–1.5 mm.
dark brown, 0.8–2.3 mm.
= 28.
= 26.
Agalinis tenuifolia
Agalinis navasotensis
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 navasotensis is known from Grimes and Tyler counties in eastern Texas; it should be looked for elsewhere in eastern Texas and northwestern Louisiana. Agalinis navasotensis differs from A. caddoensis by subtleties of its calyx shape, leaf length, corolla length, inflorescence form, and offset pollen sacs. Additional collections may show that A. navasotensis and the morphologically similar, but poorly known, A. caddoensis of western Louisiana are conspecific.
Agalinis navasotensis is in the Center for Plant Conservation’s National Collection of Endangered Plants.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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