Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
Typically erect, rhizomatous perennials. Leaves opposite (occasionally
appearing whorled in L. quadriflora due to axillary leaf fascicles),
sessile or petiolate, the blades generally ovate, ovate-lanceolate, lanceolate
or linear, the petioles or leaf bases frequently fringed with cilia. Flowers
yellow, single and pedicellate from the leaf axils, or numerous in pedunculate,
axillary racemes; calyx green, deeply (3-)5(-9)-parted nearly to the
base; corolla yellow or pale yellow, deeply (3-)5(-9)-parted, rotate,
the tube very short; stamens adnate to the corolla near the base, sometimes
alternating with small, membranous staminodes. Capsules globose to broadly
ovoid, tardily dehiscent from the apex, containing few to many angular seeds
which cohere to the placenta.
Coffey, V. J. 1973. Biosystematic study of the section Seleucia, genus
Lysimachia (Primulaceae). Unpubl. Ph.D. thesis, Univ. of Georgia.
Ray, J. D., Jr. 1956. The genus Lysimachia in the New World. Illinois
Biol. Monogr. 24:1-160.
||Flowers clustered in dense axillary racemes; foliage
punctate with dark glands.
||Flowers single from the axils, borne on slender
pedicels; foliage not punctate.
||Cauline leaves sessile, linear, 1.5-6 mm wide.
||Cauline leaves distinctly petioled or subsessile,
the blades ovate to lanceolate, 6-60 mm wide.
||Leaf blades ovate to ovate-lanceolate, 20-60 mm
wide; petioles distinct, fringed with cilia for the entire length.
||Leaf blades ovate-lanceolate to lanceolate, 6-20
mm wide; petioles of middle and upper cauline leaves rather poorly distinguished
from the blade, especially shortened upward, winged, ciliate at least
in the lower half.
23. Primulaceae, the Primrose Family
2. Lysimachia L. -- Loosestrife
- 1. Lysimachia ciliata L. -- Fringed
- 2. Lysimachia hybrida Michx.
- 3. Lysimachia quadriflora Sims
- 4. Lysimachia thyrsiflora L. -- Water
Return to Family -- Primulaceae - The Primrose
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