Flora of North America species comparison

basal produced; flowering erect, 25–40 cm, sparsely sericeous.

basal not produced; flowering erect, 7–30 cm, sparsely sericeous.

of flowering stems opposite to subopposite;

blade linear-lanceolate to narrowly oblanceolate, 10–20 × 1–1.5 mm, apex acute, usually indurate, abaxial surface sparsely pilose on midvein and margins, adaxial glabrous.

of flowering stems alternate to subopposite;

blade linear, 3–7 × 0.5–1 mm, apex acute or obtuse, abaxial surface sparsely pilose on midvein and margins, adaxial glabrous.

1 per axil, 1–2 mm.

1 per axil, 1–1.5 mm.

calyx 1.8–2 mm, indurate, shiny, yellow-brown basally in fruit, outer sepals shorter than or equaling inner.

calyx 1–1.2 mm, outer sepals shorter than inner.

ellipsoid to ovoid, 1.5–2 × 1–1.2 mm, ± equaling to slightly longer than calyx.

subglobose, 1.2–1.5 × 1.1–1.4 mm, longer than calyx, with persistent stigma.

(1–)2(–3).

1(–2).