Flora of North America species comparison

some-what lax often sprawling, longest stems sometimes prostrate, cylindric, 8–40(–100?) × 3.2–15 cm;

ribs (6–)7–10(–12), crests essentially uninterrupted;

areoles (11–)14–52 mm apart.

initially erect, later sprawling or clambering, long cylindric, 12–60(–130) × 0.6–1(–2) cm;

ribs 8–10, crests low, uninterrupted or shallowly undulate;

areoles 1–2–5 mm apart.

6–14 per areole, straight or central spines slightly curved throughout their lengths, ± opaque, white, pale tan, or purplish gray, often extensively tipped or banded with brown;

radial spines 5–10(–13) per areole, 9.5–40(–47) mm, usually less than 1/2 as long as central spines;

central spines 1–4(–5) per areole, all or mostly projecting, abaxial spine porrect or descending, frequently compressed or angular in cross section (sometimes sulcate, keeled, or striate), (12–)20–84(–96) mm.

(9–)11–13(–17) per areole, stiff and straight, usually tan, brown, or black, sometimes yellow, pale pink, ashy white, or gray, sometimes black central spines contrasting with white radial spines;

radial spines 8–16 per areole, 2–5 mm;

central spines 1(–3) per areole, closely appressed (except at the stem tip), terete, 4–9 mm.

(4.5–)5–7.5 × 5–5.6(–9) cm;

flower tube 10–30 × 10–22(–40) mm;

flower tube hairs 1–2 mm;

inner tepals pink or magenta, darkest proximally, 28–55 × 8–14(–20) mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber 4–6 mm.

3.5–6 × 3.5–7 cm;

flower tube 15–20 × 7–18 mm;

flower tube hairs 3–5(–10) mm;

inner tepals rose-pink with darker pink to magenta midstripes, proximally darker, 25–35 × 4–12 mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber 1–4 mm.

pale yellow-green or dull reddish, 20–30 mm, pulp white or pale pink.

dark green to brownish, 2–3 cm, pulp white.

= 22.

= 22.