Hamatocactus setispinus (Engelm.) Britton & Rose

국표에 없다.

Origin and Habitat: Distribution: USA, Southern Texas ( Cameron, Hidalgo, and Starr counties) and northern Mexico (Coahuila, Nuevo León and Tamaulipas ).
Type locality: Thickets along the Colorado River, Texas.
Altitude: Sea level to 550 metres.
Habitat: It is the northernmost species of the genus, occurring in thorn shrub vegetation and coastal lowlands under Mesquite scrubs, along with Astrophytum asterias, Mammillaria heyderi, Echinocereus stramineus, Wilcoxia tamaulipensis and Homalocephala texensis.

Common Names include:
ENGLISH: Hedgehog cactus, Twisted Rib Cactus, Fishhook Cactus

Description: Thelocactus setispinus, best known as Hamatocactus setispinus is a well known cactus species that produce a succession of large silky flowers in summer and autumn. It is quite variable and has had at least 30 scientific synonyms, none of which recognized. The stem sizes vary from one population to another and the extreme forms are certainly very different.. At one time, two separate varieties based on size were recognized. The larger stem size is sometimes confused with Ferocactus hamatacanthus var. sinuatus, which has all-yellow flowers. Thelocactus setispinus flowers have red centers.
Habit: Solitary, rarely sprouting near base to produce 2-3 branches, but sometimes forming large clusters, often branching or budding above.
Roots: Long fibrous roots.
Stems: 7-15(-30) cm high, 5-9 cm in diameter, globose to elongate globose, when young, growing cylindroid later, yellow-green to dull blue-green.
Ribs: 12-15, more or less oblique or twisted, thin, high, undulate on the margin, not tuberculate 1-2 mm wide, 14-18 mm high.
Areoles: 5-9 mm long, 2-3 mm wide, 20 mm apart, with extrafloral nectaries.
Radial spines: 9 to 17, slender, often 4 cm long, some white, others brownish, radiating, straight, 9-24 mm long.
Central spines: 1 to 3, longer than radials of which one, yellowish white to red, erect, hooked, 16-27 mm long.
Flower: Radial, 4-5(-7) cm long, 3-4cm in diameter, yellow, with a deep red centrer. Pericarpels scaly. Tube will developed. Inner perianth-segments oblong, acute, widely spreading. Stygma lobes pale yellow to white.
Blooming season: Summer to Autumn (Fall).
Fruit: Round, to ovoid, red with white pulp, 8-15 mm long, 10-14 mm in diameter, scaly, nearly naked, fleshy at maturity, indehiscent.
Seeds: 1,2 to 1,7 mm long, 0,5-0,8 mm in diameter, finely tuberculate.

Hamatocactus setispinus (llifle.com)

https://youtu.be/CuIq2VLznoc

https://youtu.be/r6NObLjtyTo