Flora of North America species comparison

all opposite, proximal alternate and distal opposite, or rarely all alternate, closely spaced near base of stem, gradually more widely spaced distally;

blade 0.9–4.7 mm.

racemoid cymes or small thyrses with strongly ascending branches.

calyx lobed nearly to base, lobes lanceolate, 2–4.5 × 0.4–1.1(–1.4) mm, apex acuminate;

corolla white to greenish white or yellowish green, distally or occasionally more extensively often purple-tinged especially in age, 2.3–4.4 mm, lobes oblong, 1.6–3.2 × 0.7–1.4 mm, that is, 0.6–0.8 times the length of the corolla, margins usually erose-serrate distally, apices rounded to abruptly acute, mucronate;

anthers often recurving in age but not coiling, yellow or purple, 0.5–1.2 mm, apex mucronate to short-acuminate;

style absent;

stigmas decurrent along sutures of ovary.

dehiscent medially.

 = 52.