Flora of North America species comparison

gray, cracked and irregularly fissured.

red-brown, cracked and irregularly fissured.

alternate or whorled, rigid, angle of divergence about 30°.

alternate or whorled, becoming rigid, angle of divergence about 25°.

bright green to yellow-green, becoming yellow with age, not viscid, ridges between longitudinal grooves barely papillate, smooth;

internodes 1–5 cm.

bright green, becoming yellow-green with age, not viscid, ridges between longitudinal grooves papillate, slightly scabrous;

internodes 2–5 cm.

opposite, 2–5 mm, connate to 1/2–3/4 their length, not photosynthetic;

bases thickened, brown, persistent, becoming hard, enlarged, and black;

apex setaceous.

opposite, 2–5 mm, connate to 1/2–3/4 their length;

bases thickened, brown, persistent, becoming hard, enlarged, and black;

apex acute.

2–several at node, obovoid, 5–7 mm, sessile;

bracts opposite, 6–10 pairs, light yellow and slightly reddened, ovate, 2–4 × 2–3 mm, membranous, slightly connate at base;

bracteoles slightly exceeding bracts;

sporangiophores 2–4 mm, 1/4–1/2 exserted, with 5–8 sessile to nearly sessile microsporangia.

2–several at node, obovoid, 4–6 mm, on very short, scaly peduncles (rarely sessile);

bracts opposite, 5–9 pairs, light yellow, ovate, 2–4 × 2–3 mm, membranous, slightly connate at base;

bracteoles slightly exceeding bracts;

sporangiophores 2–4 mm, 1/4 exserted, with 5–7 sessile to short-stalked (less than 1 mm) microsporangia.

cones 2–several at node, obovoid, 6–10 mm, sessile or on short, scaly peduncles;

bracts opposite, 4–8 pairs, ovate, 4–7 × 2–4 mm, membranous or papery, with yellow center and base, margins entire.

cones 2–several at node, obovoid to nearly globose, 7–15 mm, on smooth peduncles, 5–25 mm, with 1 pair of basal and 1 pair of nearly terminal bracts, at least in early cones;

bracts opposite, 3–4 pairs, ovate to circular, 5–8 × 5–12 mm, inner pairs becoming fleshy (at least centrally) and orange at maturity.

buds conic, 1–2 mm, apex obtuse.

buds conic, 1–3 mm.

= 28.