Forest clematis

Clematis glycinoides, commonly called headache vine or forest clematis, is a vigorous woody climber of the Ranunculaceae endemic to eastern Australia, scrambling 4-10 m over rainforest margins, wet eucalypt forest and sclerophyll woodland. Stems are slender, becoming somewhat woody and longitudinally ribbed, often climbing by twining leaf petioles. Leaves are opposite and ternate, with three ovate to ovate-lanceolate leaflets 3-9 cm long, acuminate at the tip, rounded to subcordate at the base, with entire to sparsely toothed margins, dark green and glabrous to sparsely hairy above and slightly paler beneath; petioles are long and flexuous, often acting as tendrils. The species is dioecious. Flowers are borne in many-flowered axillary panicles and are small but conspicuous in mass, 1.5-2.5 cm across, with four (occasionally five) creamy-white, oblong, spreading sepals (true petals absent) and numerous stamens or carpels. Female plants produce dense globose heads of small achenes, each tipped with a long, plumose, silvery-grey persistent style 2-4 cm long that aids wind dispersal. The crushed foliage releases a sharp, acrid scent.