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..2 Calyx and stem sparsely pubescent with spreading hairs 2-3 mm long
..2 Calyx and stem glabrous, or minutely puberulent or with sessile glands
....3 Leaves elliptic to lanceolate, 2-3 cm long, 0.6-1.0 cm wide; axillary spines absent or rudimentary
....3 Leaves ovate to ovate-lanceolate, 3-6 cm long, 1.5-2.5 cm wide; axillary spines present, well-developed, to 1.5 cm long