• Scientific Name: Opuntia dillenii (Ker Gawl.) Haw.
• Ref: Suppl. Pl. Succ.:79. 1819
• Synonyms: Cactus dillenii Ker Gawl.; Opuntia stricta var. dillenii (Ker Gawl.) L.D.Benson
• English Common Name: erect prickly pear
• Chinese Common Name: 仙人掌 xiānrén∙zhǎng
• Japanese Common Name: センニンサボテン [仙人サボテン/仙人仙人掌] senninsaboten
• Family: Cactaceae
• Genus: Opuntia
• Distribution: Thickets, rocks, sandy soils, also cultivated as a hedge; near sea level. S Guangdong, S Guangxi, Hainan [native to the Caribbean region; widely introduced and naturalized in tropical regions].
• Photo: 06/21/2009, South China Botanical Garden, Guangdong
• Note: This species was first introduced to China in 1702.

Shrubs sprawling or erect, 1-3 m tall. Trunk absent or short. Larger, terminal joints green to gray-green, obovate or elliptic-obovate to suborbicular, 10-35(-40) × 7.5-20(-25) cm. Areoles 2-9 mm in diam. Spines 1-12(-20) per areole on most areoles, spreading, yellow, ± brown banded or mottled, subulate, straight or curved, 1.2-4(-6) cm, basally flattened; glochids yellow. Leaves subulate, 4.5-6 mm, deciduous. Flowers 5-9 cm in diam. Sepaloids greenish with yellow margin, broadly deltoid-obovate to obovate, 10-25 × 6-12 mm, margin entire or slightly crisped, apex mucronate. Petaloids spreading, bright yellow, obovate or cuneate-obovate, 25-30 × 12-20 mm, margin entire or slightly undulate, apex rounded, truncate, or emarginate. Filaments yellow, ca. 12 mm; anthers yellow, ca. 1.5 mm. Style yellow or yellowish, 12-20 mm; stigmas 5, pale green, ca. 4.5 mm. Fruit purple, turbinate to obovoid, 4-6 × 2.5-3(-4) cm, fleshy at maturity, umbilicus deep. Seeds light tan, irregularly orbicular, 4-5 × 4-4.5 mm. Fl. Jun-Oct(-Dec). (Flora of China)