Aporocactus flagelliformis (L.)Lem.

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Aporocactus flagelliformis (L.)Lem.

Origin and Habitat: Oaxaca and Hidalgo, Mexico (although suggestions have been made that it might be native of South America), and also reported as wild or naturalized elswhere.
Habitat: Dry forests. LithopENGLISH: Rat's Tail Cactus, Whip Cactus, Rattail cactus
FRENCH (Français): Cactus Queue-de-rat, Cactier Queue de Souris, Cierge Serpent, Queue de Rat, Serpentine
GERMAN (Deutsch): Schlangenkaktus
ITALIAN (Italiano): Cactus a Coda di Topo, Coda di Topo
SPANISH (Español): Cola de Iguana, Cola de Rata, Flor de látigo, Flor de cuerno, Floricuerno, Hierba de Alferecia, Junco, Junquillo, Nopalillo, Cactus junco floricuerno hytic or epiphytic in dry forests.

Description: It is a slender, much-branched at base, creeping or epiphytic cactus cultivated as a houseplant for nearly 300 years. It one of the most popular of cacti for its ubiquity in modern collections and home use. The 'Rat's Tail' is also very free-flowering, and its long, slender stems bear multitudes of crimson-pink blooms and makes a good hanging plant. A larger specimen can be quite impressive, tumbling out of a pot, suggesting a waterfall. It is said that it deserves first place among the Cacti of easy culture.
Stem: Slender, vine-like, weak, ascending at first, soon prostrate or pendulous (or climbing), fresh-green later grey-green, terete, up to 1,5(-2) m (or even more) long, round in cross-section about 1-2 cm in diameter.
Ribs: 7-12 Obtuse and inconspicuous, margins ± tuberculate
Areoles: Minute, whitish, close set 4-8 mm apart.
Spines: 9-14(-20), tiny, acicular, bristle-like, reddish brown or reddish yellow, 4-5(-10) mm long.
Flowers: Diurnal, borne laterally, red to purplish-pink usually 5-8(-10) cm long, 2,5-4(-7,5) cm wide, double-sided, symmetrical (zygomorphic) instead of perfectly regular and similar to that of the Christmas cactus Zygocactus truncatus), limb bilaterally symmetric, upcurved and slightly oblique, open for 3-5 days, scentless. Pericarpel almost straight greenish with acute bracteoles; receptacle 3 cm, long, curved just above pericarpel, bracteoles, brownish, acute; outer tepals linear-lanceolate, ± reflexed, 2-3 cm long, 6 mm wide, crimson; inner tepals narrowly oblong, to 10 mm wide, crimson, sometimes passing to pink along the margins; stamens white to pale pink, erect, excerted; style stigma lobes 5-7, white
Blooming season: It flowers in mid and late spring and blooms for several days.
Fruit: Globose, 10-12 mm long, 10 mm in diameter, red bristly, pulp yellowish.
Seeds: Ovoid, brownish red.
Remarks: This species, too, has cristate forms.

http://www.llifle.com/Encyclopedia/CACTI/Family/Cactaceae/4775/Aporocactus_flagelliformis

Native to Mexico, these can be grown indoors and outdoors. Rat Tail cactus have long stems that trail and wind, and can grow up to 3 ft (1m) long. The stems have tiny, fine spines that almost appear fuzzy. Flowers are beautiful, bright pink or red in color. These are best grown in hanging baskets or in a tall pot with room for the tall stems to spread and grow out.

https://succulentplantcare.com/12-eye-catching-cacti-and-succulents-that-hang-or-trail/