Description
Key Characters:
Growth Form:
Erect annual or perennial herbs or small shrubs.
Stems:
Stems often swollen at the nodes. stems often rather stiff.
Roots:
Leaves:
Leaves simple.
Opposite or rarely alternate.
Blades usually linear to subulate.
Base leaf bases often connate around the stem.
Margins entire.
Veins parallel.
Petiolate (basal leaves) or sessile.
Stipules absent.
Flowers:
Flowers in crowded, terminal cymes, sometimes solitary. Cymes subtended by 1 to several pairs of bracts. Internal nectary ring present, often subtended by a number of bracts.
Flowers bisexual (perfect), actinomorphic.
Calyx 5-lobed or 5-toothed, tubular, distinctly nerved or striate, commissures not scarious.
Corolla of 5 petals, long-clawed, margins entire, dentate, or laciniate, without coronal scales; notched, cleft, or sometimes fibriate or divided, sometimes sharply differentiated into an expanded part and a basal claw, then often with 2 small outgrowths present at the juncture of the limb and claw.
Stamens 10, distinct or adnate to petals at base to form a short tube, which may be adnate to the gynophore or sometimes adnate to lower part of calyx, petaloid staminodes sometimes present; anthers dithecal, opening by longitudinal slits.
Ovary superior, 1-locular; styles 2, filiform, glabrous proximally; stigmas 2, linear along adaxial surface of styles.
Fruit:
Capsules dehiscing at apex by 4 teeth.
Seeds compressed; perisperm starchy; hard or rarely soft; true endosperm absent.
Ploidy:
Habitat:
Elevation Range: