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.

mostly erect, ovoid to cylindric, 15–30(–50) × 3.5–7 cm;

ribs (11–)12–18(–20), crests slightly undulate;

areoles 8–20 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–)12–17 per areole, straight in short-spined forms, sometimes curved or twisted in long-spined forms, appressed (radial spines) or porrect to spreading or descending (central spines when present), dull yellowish to brown or white to gray, often brown to black especially at bases or tips;

radial spines (9–)11–16 per areole, 5–18 mm;

central spines (0–)1(–3) per areole, 2–100 mm, white to yellow or brown, often becoming gray, all terete.

(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.

5–7 × 4–9 cm;

flower tube 12–20 × 10–30 mm;

flower tube hairs 1 mm;

inner tepals deep magenta (to dark purple) with darker midstripes, proximally green (to very dark purple), 20–60 × 8.5–20 mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber 2–4 mm.

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

bright red or orange red, 15–25 mm, pulp white (or pale pink).

= 22.

= 22.