Leptocereus arboreus Britton Rose 1912

Plants treelike with many erect branches, 5-8 m (16-26 ft) high with trunks to 30 cm (12 in) or more in diameter. Stems narrowed basally, 30-100 cm (12-39 in) long, terminal segments 3.5-6 cm (1.4-2.4 in) in diameter. Ribs 4-5, narrow, thin, slightly notched. Spines as many as 10, persistent, needle-like, yellowish, to 5 cm (2 in) long. Flowers bell shaped, whitish, to 3 cm (1.2 in) long; pericarpels light green, very spiny. Fruits ellipsoidal, to 10 cm (3.9 in) long and 6 cm (2.4 in) in diameter, with dense yellowish spines. Distribution: southern central and eastern Cuba.

Leptocereus assurgens (C. Wright & Grisebach) Britton & Rose 1909

Cereus assurgens C. Wright & Grisebach 1866

Plants shrubby with several prostrate or creeping stems, less than 1 m (3.3 ft) high, sometimes with trunks to 6 cm (2.4 in) in diameter. Roots not tuberous. Stems with terminal segments 1-2 cm (0.4-0.8 in) in diameter. Ribs 4-9, not notched, with areoles flush with surface. Spines needle-like, yellowish white to brownish, 2-8 cm (0.8-3.1 in) long. Central spines 4. Radial spines as many as 16. Flowers often borne in clusters, light yellow, 2.5-4 cm (1-1.6 in) long; peri-

Leptocereus arboreus, photograph by Alberto Areces-Mallea

carpels and floral tubes with reddish spines. Fruits densely spiny. Distribution: limestone cliffs near Pinar del Rio, western Cuba.

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