Diodia teres Walt. - Rough Buttonweed
Family - Rubiaceae
Stems - Erect to prostrate, +20cm tall, herbaceous, 4-angled, variously pubescent, reddish with age and in strong sun, from taproot.
Leaves - Opposite, sessile,
entire to denticulate, linear to linear-lanceolate, variously pubescent,
to 5cm long, 6mm broad, acute to aristate. Stipule (membrane) connecting
leaf bases with reddish erect capillary bristles.
Bristles of stipules.
Inflorescence - Axillary
clusters of 1 to 3 sessile flowers.
Flowers - Corolla lilac to
whitish, 4-lobed, funnelform, 4-6mm long, pubescent externally. Lobes acute
to aristulate. Stamens 4, adnate near apex of corolla tube, exserted (slightly).
Anthers pale yellow to whitish. Stigma biglobose. Ovary inferior. Sepals
4, lanceolate, green, to 2mm long, persistent on fruit. Fruit pubescent,
biglobose, splitting into 2 nutlets.
Flower close-up.
Flowering - June - October.
Habitat - Waste ground, disturbed
sites, gravel beds along streams, glades, prairies, pastures, railroads.
Origin - Native to U.S.
Other info. - This is a fairly
common plant in the lower 2/3 of the state. It is capable of growing in
some very inhospitable locations. The plant is easy to identify in the field because of its bluish flowers and long stipular bristles.
Photographs taken off Lee Rd 10, Auburn, Al., 9-29-04.
|