Perennial with sometimes slightly woody rootstock. Stems scrambling, sprawling or climbing, or ascending to erect, (80-) 150-900 mm long, sparingly to much branched, gla­brous, with a few minute recurved prickles or with short curled whitish hairs. Leaves in whorls of 6-8(-10), 1-nerved, (3-)5-20(-23) X (0,3-)0,5-2(-2,5) mm, linear to narrowly lanceolate or oblanceolate, sometimes with a brownish white mucro at apex; surface gla­brous, with small upward-directed prickles or with short straight hairs, margins often re-flexed, glabrous or with a few recurved prickles. Inflorescence broadly pyramidal to ± cylindrical, cymes many- to several-flowered, ultimate branches with (4—)3—1 small linear bracts or ebracteate; peduncles and pedicels (1—)1,5—4(—5) mm long, ± filiform, glabrous or scabrous, very rarely hairy, divaricate in fruit. Flowers: corolla 2-4 mm in diam., mostly (bright) yellow, creamy yellow or greenish yel­low, lobes (much) longer than wide, acute or sometimes slightly acuminate; stamens c. 1/4 to 3/4 of lobe length; ovary c. 0,3-0,6 mm long. Fruit glabrous, ± tuberculate or granulate, or covered with short straight or curled whitish hairs; mericarps subglobose, each c. 1-2 mm in diam. Chromosome number. 2n=22.