Flora of North America species comparison

to 2 m, wiry, branches numerous, finely ridged;

cladophylls solitary or in fascicles of 3 or more per node, linear, flattened, straight or curved, 8–22 × 2 mm, with single prominent vein.

to 4 m, wiry, smooth, branches planate;

cladophylls in fascicles of (5–)8–20 per node, filiform, 4–10 × 0.5 mm, ± rigid, with single vein.

membranous, 1–2 mm;

blade diamond-shaped, attached in middle, tapering to slender apex.

membranous, 1–2 mm;

blade forming short spine with reflexed apex, base hardened.

in axillary racemes, 5–9(–17)-flowered.

terminally umbellate, 1–4-flowered.

bisexual;

perianth rotate to campanulate;

tepals white to pale pink, 3–4 × 1.5–2 mm;

pedicel 5–8 mm, jointed 2–3 mm above base.

bisexual, nodding;

perianth spreading, campanulate;

tepals white, 3–4 × 1–1.5 mm;

pedicel 1–3 mm, jointed at or just above base.

red, 5–8 mm.

purplish black, 4–5 mm.

1.

1–3.

, woody, scrambling or climbing to 5 m;

roots fibrous.

= 40, 60.

= 20.