Agalinis tenuifolia |
Agalinis caddoensis |
|
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gérardie à feuilles ténues, slender-leaf agalinis, slender-leaf false foxglove |
Caddo false foxglove |
|
Stems | simple or branched, 10–100 cm; branches ascending to spreading, quadrangular, sharply ridged to winged distally, glabrate, sometimes scabrous. |
widely branched, 20–60 cm; branches ascending, angular distally, scabridulous. |
Leaves | 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 or reflexed or recurved; blade filiform, 15–35 x 0.3–0.6 mm, margins entire, siliceous, adaxial surface scabrellous; axillary fascicles absent. |
Inflorescences | racemes, elongate, flowers 2 per node; bracts shorter than, or longer than, or both shorter and longer than, pedicels. |
racemes, flowers 1 or 2 per node; bracts equal to or shorter than pedicels. |
Pedicels | ascending-spreading, some upcurved distally, 6–25 mm, glabrous. |
spreading-ascending, 7–22 mm, proximally scabridulous. |
Flowers | 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 hemispheric-campanulate, tube 3.5–5.5 mm, glabrous, lobes triangular-subulate, 0.8–1.7 mm; corollas rose purple, with 2 yellow lines and red spots in abaxial throat, 17–30 mm, throat pilose externally and glabrous within across bases of adaxial lobes, lobes spreading, 6–9(–11) mm, glabrous externally; proximal anthers parallel to filaments, distal perpendicular to filaments, pollen sacs 2.5–3.8 mm; style exserted, 12–16.5 mm. |
Capsules | globular, 4–7 mm. |
unknown. |
Seeds | tan to brown, 0.5–1.5 mm. |
unknown. |
2n | = 28. |
|
Agalinis tenuifolia |
Agalinis caddoensis |
|
Phenology | Flowering (late Jul–)Aug–Nov. | Flowering Oct. |
Habitat | Wet to dry roadsides, ditches, margins of streams and ponds, borders of woodlands, dry to moist prairies, fallow fields, railroad embankments, rocky cliff faces and bluffs. | Oak woods, dry loamy soils. |
Elevation | 0–1600 m. (0–5200 ft.) | 50–100 m. (200–300 ft.) |
Distribution |
AL; AR; CO; CT; DC; DE; FL; GA; IA; IL; IN; KS; LA; MA; MD; ME; MI; MO; MS; NC; ND; NE; NH; NJ; NM; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; WY; MB; NB; NS; ON; PE; QC
|
LA |
Discussion | 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 caddoensis is known only from two collections made by F. W. Pennell in 1913 and is most similar morphologically to A. navasotensis; see 22. A. navasotensis for a comparison. Agalinis caddoensis should be expected in northwestern Louisiana and eastern Texas and likely flowers in September as does A. navasotensis. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 17, p. 554. | FNA vol. 17, p. 540. |
Parent taxa | Orobanchaceae > Agalinis | Orobanchaceae > Agalinis |
Sibling taxa | ||
Synonyms | Gerardia tenuifolia, A. besseyana, A. tenuifolia var. leucanthera, A. tenuifolia var. macrophylla, A. tenuifolia var. parviflora, A. tenuifolia var. polyphylla, G. besseyana, G. tenuifolia subsp. leucanthera, G. tenuifolia subsp. macrophylla, G. tenuifolia subsp. parviflora, G. tenuifolia subsp. polyphylla | Gerardia caddoensis |
Name authority | (Vahl) Rafinesque: New Fl. 2: 64. (1837) | Pennell: Proc. Acad. Nat. Sci. Philadelphia 73: 519. (1922) |
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