Two wings lead out from the central spine.
Ranges in the central spine include the Crocker, the Nieuwenhuis, and the Muller mountains.
Then, you have a central spine even before you work on day one.
The 19 species of Sclerocactus have at least one hooked central spine.
Ultracongruent inserts avoid some of the drawbacks of central spine postero-stabilized inserts.
In a traditional vaulted roof the two sides press in toward the central spine, which helps support them.
Spines: 4--55 per areole, < 2 mm diam, needle- to dagger-like, glabrous to puberulent, straight, curved, or curly; central spines (0)1--6(9).
Spines: central spines 3--4 per areole, lowermost 18--25 18--25 18--25, tips dark; radial spines 30--60, in 2--3 superimmosed ranks, 6--1+(20) mm.
Spines: 1--many per areole, < 2 mm diam, generally needle-shaped, smooth, straight, tip smooth or barbed, epidermis separating as a papery sheath; central spines generally not distinct from radial spines; glochids generally numerous in each areole.
Spines: 10--32 per areole, 2--4.5 mm wide, generally awl-shaped, generally flat, ringed with conspicuous ridges, straight to curved or +- hooked, some bristle-like; central spines generally 4 per areole.
Stem: < 60, 5--45 70) cm, 4--9 cm diam, cylindric; ribs 10--13; tubercles +- 0. Spines: (8)15--45 70r areole, color and shape variable; central spines 2--7, straight to twisted.
