Morphology

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Description

Shrubs, erect, to 1 m. Stem segments not easily detached, bluish to gray-green, flattened, circular to broadly obovate, 15-30 × 12-25 cm, nearly smooth, glabrous; areoles 5-7 per diagonal row across midstem segment, elliptic to obovate, 3-8 × 2-6 mm; wool tan, aging blackish. Spines 1-5 per areole, spreading, yellow to orange, tipped yellow, darkening with age (at higher elevations), or dark red-brown (lower elevations), ± acicular, longest 20-67 mm, terete to flattened near base, often curved. Glochids widely spaced, in crescent at adaxial margin of areole, partially encircling areoles, and in poorly developed subapical tuft, yellow, of irregular lengths, tending to elongate towards bases of areoles, to 4 mm. Flowers: inner tepals pale yellow to buff throughout, to 25-30 mm; filaments pale green; anthers and style yellow; stigma lobes green. Fruits reddish purple, ellipsoid to spheric, barrel-shaped, 33-45 × 40-50 mm, juicy, base not or little tapered, glaucous, spineless; areoles 16-20, mostly near apex. Seeds yellow to tan, 3.5-4.5 × 3-4 mm diam.; girdle protruding to 1 mm. 2n = 22.

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Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA

Source: Missouri Botanical Garden

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