Echinocereus harthelowanus Britton Rose 1922

Plants many-stemmed, often forming clumps to 80 cm (31 in) wide. Stems cylindrical, erect, to 30 cm (12 in) high, 3.5-5 cm (1.4-2 in) in diameter, mostly obscured by heavy spination. Ribs 8-10, somewhat tuberculate, with large areoles. Spines pink to red when young, becoming darker, often black with age. Central spines 5-9, stout, straight, to 7 cm (2.8 in) long. Radial spines as many as 18,1-2 cm (0.4-0.8 in) long. Flowers arising from near the stem tips to the bases, broadly funnelform, lavender, to 5 cm (2 in) long, 4-6 cm (1.6-2.4 in) in diameter. Distribution: Magdalena region of Baja California Sur, Mexico, and neighboring islands. Echinocereus harthelowanus is poorly known.

Echinocereus berlandieri (Engelmann) F. Haage 1859 Cereus berlandieri Engelmann 1856 Cereus blanckii Poselger 1853, Echinocereus blanckii (Poselger) Palmer 1865

Plants many-stemmed, forming clumps to 1 m (3.3 ft) wide. Stems cylindrical, tapered at the base, soft, prostrate or erect at the tip, dark or purplish green, 5-60 cm (2-24 in) long, 1.5-3 cm (0.6-1.2 in) in diameter. Ribs 5-7, low, with poorly defined tubercles. Central spines 1-3, stout, pointing outward, yellowish to dark brown, 2.5-5 cm (1-2 in) long. Radial spines 6-9, whitish, 1-2.5 cm (0.4-1 in) long. Flowers borne below the stem tips, broadly funnelform, pink to reddish purple, 7-8 cm (2.8-3.1 in) long, to 7 cm (2.8 in) in diameter. Fruits ovoid, green, 2-2.5 cm (0.8-1 in) long, with spines falling away. Distribution: south Texas and neighboring Nuevo León and Tamaulipas, Mexico, from sea level to 600 m (2000 ft).

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