Description
Key Characters:
Growth Form:
Annual herbs.
Stems:
Stems angled, often up to 50 cm long, with intraxylary phloem. sparsely pubescent with minute simple hairs concentrated on young tips and buds and on main veins below, later glabrate.
Roots:
Leaves:
Leaves simple.
Alternate.
Blades ovate to elliptic, on vigorous shoots up to 10 cm long, more often ca. 5 cm long, 2–2.5 cm wide.
Apex acute to acuminate.
Base cuneate to rounded, often oblique.
Surfaces sparsely pubescent to glabrate.
Margins entire or with a few shallow teeth, these occasionally well–developed, up to 5 mm long.
Petioles 1–3 cm long.
Stipules absent.
Flowers:
Flowers solitary in the leaf axils or stem forks, subpendulous, pedicels slender, 5 mm long at anthesis.
Flowers bisexual (perfect), solitary in the leaf axils or stem forks, pedicellate.
Calyx 5-lobed, not prominently angular, bell-shaped, connate in lower ⅔, ca.2.5 mm long including lobes, these broadly triangular, ca. 1 mm long, greatly enlarging in fruit.
Corolla pale yellow, with a diffuse brownish spot at base, rotate, ca. 15 mm in diameter.
Stamens 5; filaments inserted near base of corolla tube; anthers oblong, opening by slits.
Ovary superior, 2-celled, placentation axile; ovules numerous on an enlarged placenta; style 1, 4–5 mm long, erect.
Fruit:
Berries pale yellow; succulent; globose; 9–12 mm in diameter; enclosed in the inflated papery calyx tube; pedicels 1–2 cm long; drooping.
Seeds numerous; discoid; ca. 1 mm long; minutely shallowly reticulate; lenticular.
Ploidy:
2n = 24; 48; 50
Habitat:
Disturbed sites.
Elevation Range: