Flora of North America species comparison

prostrate or spreading, much branched, to more than 100 cm, hirtellous to glabrate.

grayish green, sessile or petiolate, those of pair slightly unequal;

petiole to 25 mm, hirtellous to glabrate;

blade deltate to deltate-ovate, 2–30(–45) × 2–35(–50) mm, base truncate to subcordate or rounded and short decurrent, margins flat or slightly undulate, apex acute to broadly rounded and often apiculate, puberulent to glabrate.

solitary flowers or 2–5-flowered cymes, sessile or with pedicel to 5 mm;

bracts linear-subulate, 1–7 mm, puberulent, usually sparsely so.

chasmogamous perianth 2.5–5.5 cm, sparsely puberulent, tube 1–2 mm diam., limbs 13–25 mm diam., stamens 5; cleistogamous perianth 3–12 mm, puberulent, stamens 5.

5-ribbed with pair of parallel grooves between ribs, each rib and pair of grooves ending at summit in inconspicuous, glandless knob, oblong, truncate at both ends, often constricted ca. 1 mm above base and below apex, 5–8 mm, hirtellous to sparsely puberulent with capitate hairs and with few, scattered, moniliform hairs 0.2–0.3 mm.