previous arrow
next arrow

Genus :


Family :


Species of this Genus


Annual or perennial herbs. Stem 4-angled or sometimes inflated and almost leafless. Leaves opposite, rarely whorled or alternate, sessile, linear to ovate. Inflorescence axillary or terminal, many-flowered, bracteate heads or rarely solitary. Calyx tube campanulate, urn-shaped, or semiglobose, sepals 4-8, with or without appendages. Petals 0-8, corrugated in bud. Stamens 4-23. Ovary 2 to 5-celled, septum complete and therefore, continuous with the style, styles very short to longer than the ovary, stigmas capitate. Fruit a capsule, opening with a lid, later irregularly below. Seeds numerous.

Key to the species

Serial Key Reference
1a. Leaves attenuate at base, oblique; petals 4 N.lanceolata
1b. Leaves cordate and sub amplexicaul at base, not oblique; petals absent N.brevipes