Flora of North America species comparison

prostrate to ascending, 4–20 cm.

spreading to prostrate, 5–35 cm.

opposite proximally, often alternate distally;

stipules 0.5–1.3 mm;

blade elliptic to oblanceolate, 3–12 mm, hirsute or ciliate, adaxial surface sometimes glabrescent.

opposite, or distalmost alternate;

stipules 0.5–1.5 mm;

blade obovate-elliptic to suborbiculate, 3–7(–10) mm, glabrous or sometimes short-ciliate.

axillary, leaf-opposed or on short branches, mostly 3–8-flowered.

mostly leaf-opposed, 6–10-flowered.

0.9–1.8 mm, densely pubescent;

calyx burlike;

sepals equal or somewhat unequal, 0.8–1.5 mm, hirsute, hairs of perigynous zone hooked or tightly coiled, each sepal with 1–2 spinelike hairs at apex;

stamens 2–3 or 5;

staminodes petaloid, 0.4–0.6 mm;

styles distinct or connate in proximal 1/3.

1–1.5 (–1.8) mm, usually glabrous or sometimes short-ciliate;

calyx not burlike;

sepals equal or sometimes unequal, 0.5–0.6 mm, glabrous;

stamens 5;

staminodes petaloid, 0.5 mm;

styles connate in proximal 1/3.

0.7–0.9 mm, ca. equaling sepals.

1–1.3 mm, usually longer than sepals.

= 18, 36 (Europe).

= 18, 36, 72 (Europe), 54 (Africa).