Flora of North America species comparison

erect, branched, 1–10 cm.

prostrate or decumbent, 1–30 cm, freely rooting at nodes, forming mats.

alternate, erect, not distinctly petiolate, with clasping leaf sheaths;

blade linear, 5–50 × 0.5–2 mm.

opposite, sessile;

blade oblanceolate to rhombic, 2–20 × 0.5–10 mm.

terminal, 1-bracteate;

bract linear to oblanceolate, 1–6 mm.

leafy.

4–12;

sepals 1.5–2.5 mm;

petals 5, white, 1.5–3 mm;

stamens 3, anther yellow.

1–8, slightly bilateral;

sepals 1–1.5 mm;

petals 5, connate proximally, white, unequal, 1–2 mm;

stamens 3, anther pink or yellow.

0.8–1.2 mm, tuberculate;

elaiosome absent.

0.7–1.2 mm, tuberculate;

elaiosome present.

= 14.

= 20, 40.