Flora of North America species comparison

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

basal produced; flowering erect, 15–35 cm, densely to 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, 6–18 × 0.6–1.3 mm, apex acute, abaxial surface appressed-pilose mostly on midvein and margins, adaxial glabrous.

1 per axil, 1–2 mm.

1 per axil, 3–5 mm.

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

calyx 1.8–2.2 mm, outer sepals longer than inner.

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

secund, depressed-globose, (1.2–)1.8–2.2 × 2.2–2.4 mm, ± equaling to longer than calyx.

(1–)2(–3).

(4–)6.