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Published In: Botanical Magazine 18: pl. 660. 1803. (Bot. Mag.) Name publication detailView in BotanicusView in Biodiversity Heritage LibraryView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/1/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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5. Lysimachia quadriflora Sims (narrow-leaved loosestrife)

L. longifolia Pursh

L. revoluta Nutt.

Steironema quadriflorum (Sims) Hitchc.

Pl. 510 f, g; Map 2325

Plants with elongate, slender rhizomes. Stems 20–70 cm long, relatively slender (2–3 mm in diameter at the base), erect or strongly ascending,unbranched or short-branched above the midpoint (but usually with very short branches represented by dense clusters of leaves at many of the nodes), glabrous. Basal leaves rarely present at flowering, shorter than the stem leaves, long- petiolate, the blade elliptic to obovate. Stem leaves opposite (sometimes appearing whorled because of the dense clusters of leaves in the axils), all sessile or nearly so. Leaf blades 3–9 cm long, 0.2–0.6 cm wide, linear to very narrowly lanceolate, the bases angled or tapered, angled or somewhat tapered to a sharply pointed tip, the margins entire, usually curled-under, glabrous or with a few, long, spreading hairs at the base, the surfaces lacking gland dots, not punctate, glabrous, the upper surface green to dark green, shiny, the undersurface slightly lighter green, not shiny; secondary veins not evident. Inflorescences axillary from the uppermost nodes, of solitary flowers, the flower stalks 0.5–3.5 cm long, glabrous. Calyces mostly 5-lobed, the lobes 4–6 mm long, lanceolate, not gland-dotted or punctate, usually with 3–5 evident veins. Corollas mostly 5-lobed, the lobes 7–10 mm long, obovate to rhombic-elliptic, angled or slightly tapered to a sharp, sometimes extended point at the tip, the margins otherwise entire or slightly uneven, yellow, densely glandular and with reddish markings on the upper surface toward the base, lacking purple spots or lines. Stamens shorter than the corollas, the filaments 2–3 mm long, not fused into a basal tube, glandular-hairy. Staminodes alternating with the stamens, slender or somewhat broadened toward the base. Styles 4–5 mm long. Fruits 3.5–5.0 mm long, broadly ovoid to globose. Seeds 1.1–1.4 mm long, irregularly elliptic, oblong, or rhombic in outline, triangular in cross-section with 1 side somewhat concave, dark brown to reddish brown, shiny. 2n=34. June–August.

Scattered in the Ozark and Ozark Border Divisions (eastern U.S. west to Minnesota and Alabama; Canada). Fens, bases and ledges of bluffs, seepy banks of streams, rivers, and spring branches, and occasionally bottomland forests and swamps; usually on calcareous substrates.

The clusters of leaves that develop on very short branches in the main leaf axils, sometimes make the leaf distribution appear whorled. Plants with white or cream-colored flowers have been collected rarely.



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