Flora of North America species comparison

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.

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 forming short spine with reflexed apex, base hardened.

membranous, 1–2 mm;

blade broadly lanceolate.

terminally umbellate, 1–4-flowered.

in axillary umbels, 1–3(–4)-flowered.

bisexual, nodding;

perianth spreading, campanulate;

tepals white, 3–4 × 1–1.5 mm;

pedicel 1–3 mm, jointed at or just 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.

purplish black, 4–5 mm.

red, 6–8 mm.

1–3.

1–4(–6).

, woody, scrambling or climbing to 5 m;

roots fibrous.

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

roots tuberous.

= 20.

= 20.