Galium undulatum Puff

Perennial with a slightly woody rootstock. Stems ascending to erect, ca. 0.3-1.5 m long, usually with few lateral branches; 1.5-2.5 mm in diam., glabrous or with a few reversed prickles on the 4 distinct angles, often ± glaucous. Longest internodes 30-55(70) mm. Middle cauline leaves in whorls of 6, 1-nerved, (15)20-30 x (6)8-10(11) mm, obovate to obovate-oblong, with a short hyaline point at the apex, cuneate at the base; margins with ± coarse reversed prickles, leaves otherwise glabrous; often glaucous. Synflorescences ± cylindrical, paracladia 3-to ± many-flowered, ultimate branches usually ebracteate; peduncles (5)10-22 mm, glabrous, pedicels (3)5-10(20) mm, slightly elongating after anthesis, filiform, glabrous, divaricate in fruit. Flowers 4-merous; corolla (2.5)3-4 mm in diam., rotate, whitish; lobes much longer than wide, acute; stamina very short, much less than half as long as the lobes, filaments thickish; styles short. Fruits dry, glabrous, granulate; mericarps ± globose, each (2)2.5-3.5 mm wide. Flowering Period: September to December (January, February).