Flora of North America species comparison

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

basal produced; flowering erect, 20–50 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 whorled or opposite;

blade elliptic to lanceolate, 8–15 × 4–7 mm, apex acute, abaxial surface pilose on midvein and margins, adaxial sparsely pilose or glabrous.

1 per axil, 1–2 mm.

1 per axil, 0.5–2 mm.

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

calyx 1.6–2 mm, outer sepals longer than inner.

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

ellipsoid to ellipsoid-ovoid, 1.5–2 × 1–1.5 mm, ± equaling calyx.

(1–)2(–3).

2–3.