Solitary or slowly
Phenology: Summer grower (Dormant in winter).
Stem: Up to 15 cm tall, 10 cm in diameter; around 13 high
ribs, dark bluish green. The cultivated variety "brevispinus"
differs only for its shorter spines, while all the other
trait are identical to standard species.
Areoles : 10-14 mm long, with short
central 1 to 3
hooked (5 - 15 mm long);
radials 12 to 16 (5-15 mm long)
Flower: Silky yellow with darker red
throat , 3 - 4,2 cm across, 3,8 - 5,2(7) cm long.
Fruits: Red and
ovate, 8-11 mm long, that
basally at full
Seeds: 1,3-1,7 mm long and 0,5 -0,8 mm diameter.
Summer, it flowers very well, even when quite young, producing
flowers in succession
Remarks: In the
past several forms with different spine and stem size, flowers and fruit
colour have been described and some authors gave them a variety
name, however they grows at the same locality and under the same
condition, so nowadays all them are considered part of a polymorphic
subspecies, varieties and forms:
H. setispinus hamatus With long hooked central spines.
H. setispinus hamatus fa. flavibaccatus whith yellow
H. setispinus setaceus With very thin spines.
H. setispinus brevispinus With very short central spines.