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.

slender, to 3 m, wiry, smooth to slightly ridged;

cladophylls solitary at each node, broadly lanceolate to ovate, 15–35 × 5–15(–20) mm, leathery, with 20–24 parallel veins.

membranous, 1–2 mm;

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

membranous, 1–2 mm;

blade broadly lanceolate.

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

in axillary umbels, 1–3(–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;

perianth campanulate;

tepals white, with green median stripe abaxially, 5–7 × 1–1.5 mm;

pedicel 5–8 mm, with hard, raised joint 1–3 mm above base.

red, 5–8 mm.

red, 6–8 mm.

1.

1–4(–6).

, erect to deflexed, branching, climbing to 1.5 m;

roots tuberous.

= 40, 60.

= 20.