Flora of North America species comparison

prostrate to decumbent.

exfoliating in grayish or grayish brownish strips.

erect to decumbent;

twigs with simple trichomes.

marcescent, opposite;

petiole absent or present;

blade elliptic, ovate, or ovate-elliptic, herbaceous, margins entire or shallowly crenate-serrate, plane;

venation acrodromous.

terminal, racemes or racemose cymes, 4–12-flowered;

peduncle present.

present.

bisexual;

perianth and androecium nearly hypogynous;

hypanthium adnate to ovary proximally, free distally, hemispheric, weakly 9–11-ribbed in fruit;

sepals eventually deciduous, (4–)5–6, erect, narrowly oblong or oblong-lanceolate, appressed-pubescent abaxially;

petals 4–6, valvate, reflexed, white, obovate or oblong, base clawed, surfaces glabrous;

stamens 8–12;

filaments distinct, dorsiventrally flattened, abruptly tapered medially, apex not 2-lobed;

anthers elliptic;

pistil (2–)4–5-carpellate, ovary slightly inferior, (3–)4–5-locular;

placentation axile;

styles caducous, (3–)4–5, distinct or connate basally.

depressed-spheric, cartilaginous, dehiscence basipetally septicidal, carpels separating entirely.

1 per locule, brown or reddish brown, ellipsoid, trigonous.