Flora of North America species comparison

gray, cracked and irregularly fissured.

gray, cracked and fissured.

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

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

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

internodes 1–5 cm.

pale green, becoming yellow with age, not viscid, usually smooth or very slightly scabrous, with numerous longitudinal grooves;

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

bases membranous, brown, shredding and becoming gray with age, ± persistent;

apex obtuse.

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, ellipsoid to obovoid, 4–8 mm, sessile;

bracts opposite, 4–8 pairs, light yellow, obovate, 2–3 × 2 mm, membranous, slightly connate at base;

bracteoles exceeding bracts;

sporangiophores 3–9 mm, 1/4–3/4 exserted, with 6–10 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 ellipsoid, 6–13 mm, sessile or on short peduncles;

bracts opposite, 4–7 pairs, elliptic, 3–7 × 2–4 mm, membranous with light brown to green, thickened center and base, slightly connate at base, margins entire.

buds conic, 1–2 mm, apex obtuse.

buds conic, 1–3 mm, apex obtuse.

= 28.