Aureolaria pectinata (Nutt.) Pennell
Family - Scrophulariaceae
Stems - To .8m tall, erect, branching, herbaceous, from stout whitish roots, mostly 4-angled, densely glandular pubescent, viscid. Hairs of the stem both long and short.
Leaves - Opposite, short-petiolate to sessile, pinnately lobed, ovate, pubescent as the stem. Lobes divided again. Ultimate divisions acute. Leaves of the flowering branches +/-3cm long, +/-2cm broad. Leaves falling easily and quickly as the plant dries.
Inflorescence - Typically single axillary flowers in the upper stems and branches. Pedicels pubescent as the stem, +1cm long, ascending, expanded at the apex and slightly darker green at the base of the calyx.
Flowers - Corolla yellow, +/-3cm long, pubescent externally and internally, lobed. Lobes rounded. Stamens 4, included to partially exserted, didynamous. Filaments to 1.5cm long, one pair mostly glabrous, one pair pubescent to the apex. Anthers 6mm long, bilobed, with pointed bases, dehiscing longitudinally, pubescent along the suture. Ovary superior, glabrous, 2-3mm long and broad in flower, slightly compressed, whitish-green. Style glabrous, light green, to 1.5m long in flower. Stigma darker green than the style, swollen. Calyx accrescent. Calyx tube to 5-6mm long in flower, 4-5-lobed, pubescent as the stem, whitish-green. Calyx lobes foliaceous, 1-1.5cm long in flower, longer in fruit (to +2cm ), green like the leaves.
Flowering - August - September.
Habitat - Dry and rocky open woods, borders of glades. On acid substrates.
Origin - Native to U.S.
Other info. - This species can be found in the Ozark region of Missouri and is fairly common. It is easily identified in the field because of its divided, opposite leaves, large yellow flowers, and viscid stems (which are covered with glandular hairs).
Photographs taken off Hwy. Z, Carter County, MO., 8-31-03.