The said towers are adorned with circular ranges of columns of the Corinthian order, with domes upon the upper part, and at the vertex of each a curious pineapple.英文原著 · 《London in 1731》
Subglobose with a deeply depressed vertex, or becoming cylindrical, 3 to 8.5 cm. in diameter: tubercles sharply quadrangular-conical, with densely woolly axils: radial spines 15 to 30, white, very slender (bristly) and radiant, sometimes coarse capillary, 4 to 7 mm. long, interwoven with those of neighboring tubercles and so covering the whole plant; central spines 2 to 4, robust and straight, erect or divergent, whitish or reddish, black-tipped, 5 to 6.5 mm. long: flowers reddish, 1 to 2 cm. broad: fruit unknown. Type unknown.英文原著 · 《The North American Species of》
Depressed, globose, usually with depressed vertex, 8 to 12 cm. broad, 2.5 to 5 cm. high: tubercles elongated: radial spines 10 to 22, whitish, 5 to 12 mm. long, the lower usually the longer, stouter, and often darker; central spine 4 to 8 mm. long, light yellowish-brown, stout, straight, and porrect: flowers 2 to 2.5 cm. long, reddish-white: fruit incurved, 1.5 to 3 cm. Bound. 4-14).英文原著 · 《The North American Species of》
The capillary radials give the plant a white-woolly appearance. The younger spines at the vertex are erect and tufted. It resembles C. grahami, but the tubercles are much more slender and not thickened at base, all the spines are more slender, the central hooked one is more reddish, and the fruit is much shorter.英文原著 · 《The North American Species of》
++ Flower and fruit remaining central in the very woolly vertex of the plant. ++ Central spine solitary or wanting.英文原著 · 《The North American Species of》
If we add a mountain fold at this vertex, there are three valleys and two mountains. If we add a mountain fold at this vertex, there are three valleys and two mountains.演讲 · 《The unexpected math of origami ~ Evan Zodl》