Lysimachia lanceolata Walt.

Lysimachia lanceolata plant

Family - Primulaceae

Stems - To +/-40cm tall, erect, herbaceous, from a taproot, typically purplish, 4-angled, mostly glabrous but with some branched pubescence near the apex.

Leaves - Opposite to whorled. Basal leaves petiolate. Petioles involute, glabrous. Blades ovate, glabrous. Cauline leaves sessile or short-petiolate, with distinct white coarse cilia at base of blade and on petiole. Blades tapering to the base, to +/-8cm long, 1.5cm broad, acute, linear-lanceolate, entire, glabrous, green above, lighter green below, with obvious midrib and lateral venation.

Lysimachia lanceolata leaves

Inflorescence - Axillary pedunculate flowers at the apex of the stem (typically in a false whorl of 4). Peduncles to +3cm long, purplish, glabrous, arched.

Flowers - Corolla yellow, to 2cm broad, 5-lobed. Lobes obovate to orbicular with an abruptly acuminate apex, 6-7mm long, slightly erose on apical margins, densely glandular adaxially. Glands yellow, stalked and sessile. Corolla tube short, with a brown ring. Fornices of corolla attenuate, to 2mm long, alternating with the corolla lobes. Stamens 5, opposite the corolla lobes, adnate at the apex of the corolla tube, erect. Filaments whitish, glandular, 3mm long. Anthers yellow, +2.5mm long, curved to falcate at maturity. Ovary superior, green, glabrous, ovoid to globose, 1.3mm in diameter, unilocular. Placentation free-central. Style white, glabrous, 5mm long. Stigma minute. Calyx tube green, glabrous, 1-1.5mm long, 5-lobed. Lobes green, glabrous, +5mm long, acute, spreading.

Lysimachia lanceolata flower

Lysimachia lanceolata calyxCalyx.

Flowering - May - August.

Habitat - Dry or wet rocky woods, slopes, ridges, thickets, valley bottoms, wet prairies, pond margins, swamps, railroads.

Origin - Native to U.S.

Other info. - This little species is found mainly in the southern half of Missouri. The plant is common in the habitats mentioned above. This is an easy species to ID when in flower because of its long, thin, whorled leaves.

Photographs taken on Stegal Mountain, MO., 6-17-03.


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