Flora of North America species comparison

annual, densely branched distally;

branches finely dissected, ascending to perpendicular, unarmed;

cladophylls in clusters of (2–)4–15(–25) per node, filiform, straight or curved, 1–3 cm.

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.

scalelike, 3–4 mm;

blade lanceolate, base hardened.

membranous, 1–2 mm;

blade broadly lanceolate.

in axillary racemes, 1–3-flowered.

in axillary umbels, 1–3(–4)-flowered.

some unisexual;

perianth campanulate, yellow or yellowish green;

tepals connate 1–2 mm, greenish white, 3–8 × 1–2 mm;

pedicel 8–12 mm, jointed at or above middle.

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, 6–10 mm.

red, 6–8 mm.

2–4.

1–4(–6).

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

roots tuberous.

= 20, 40.

= 20.