Diodia virginiana L.
Family - Rubiaceae
Stems - Trailing to ascending, herbaceous, 4-angled, often with reddish tinge, retrorse pubescent to glabrous, to +15cm tall, +30cm long.
Leaves - Opposite, sessile. Pairs of opposing leaves joined at base by sheathing stipules. Stipules with 3-5 bristle-like lobes on upper margin. Middle lobe longest, to 5mm long. Leaf blades to 4cm long, 1.5cm broad, elliptic below, becoming linear-oblong above, entire, with antrorse strigillose margins, glabrous or sparse pilose at base on margins, typically acute.
Inflorescence - Single or double flowers from leaf axils. Flowers sessile.
Flowers - Corolla white, 4-lobed, salverform. Corolla tube to 8mm long, glabrous. Lobes 5-6mm long, 2.5mm broad spreading, white, glabrous externally, dense pubescent internally. Stamens 4, alternating with corolla lobes, adnate at apex of corolla tube, exserted. Filaments to +4mm long, white, glabrous. Anthers 2mm long, white. Style 1.1cm long, glabrous, filiform, flattened. Stigmas 2, 4mm long. Ovary 2-locular. Calyx tube to 4mm long (in flower), 2-lobed. Lobes 6mm long, attenuate, ciliate-margined. Caylx accrescent. Fruit to 8mm long, pubescent to glabrous.
Flowering - June - September.
Habitat - Wet soils, pond margins, wet meadows.
Origin - Native to U.S.
Other info. - This species
can be found in the lower 1/3 of Missouri. Our plants belong to variety
virginiana. Another variety, var. attenuata
Fern., has more narrow fruits and is not found in Missouri.
Photographs taken in the Croatan National Forest, NC., 7-11-02.