Xerophyte

Central Spines

4 to 10 all thick up to 10,5 cm long, twisted and more or less hooked bright red in the new growth then hardening to a clearer orangish-red or amber colour.

Seeds

Up to 2,5 mm wide, net-patterned and black.

Description

Ferocactus chrysacanthusSN|12323]]SN|12323]] f. rubrispinus has distinctive bright red spines, and can be easily tell apart from the standard Ferocactus chrysacanthusSN|12323]]SN|12323]] with characteristic golden, denser and shorter yellow spines. Though some of this rare red spined specimens can be found in habitat, most of the "rubrispinus" found in cultivation are (presumably) horticultural hybrids selected for their spine colours. The plant is very densely spined (one of the spiniest of the Ferocacti) and because of that, will tolerate full sun.

Flowers

Near the center of the plant, typically yellow or brownish yellow, but also orange, 2,5 cm long, 4,5-5 cm in diameter when fully open. The inside petals are yellow or orange, the outside ones are brownish. Scale naked on the axil, closed set and imbricated, the lower one rounded ang green, the upper ones more oval brownish, the margin some time ragged. Outer perianth-segments stiff. Pinkish-brown, inner perianth-segments 2 cm long, yellow with reddish-mid-stripesand toothed margin.

Blooming Season

Summer.

Ribs

13 to 22 , tubercled.

Stem

Usually simple, globose to cylindrical, dull greyish green.up to 30(-40) cm in diameter, 90(-100) cm tall.

Radial Spines

4 to 12 ( or more) up to 5 cm long, slender and white.

Fruits

Yellow 3 cm long.