Proc. Biol. Soc. Wash. 49: 148. 1936.
Herbs, forming hemispheric clumps 6–8 dm diam., glabrous or sparsely puberulent. Stems 6–10 dm. Leaves spreading; petioles of proximal leaves 1–2.5 cm; blades of midstem leaves suborbiculate to widely ovate, 3.5–5 × 3–5 cm, base obtuse to cordate, symmetric, apex obtuse to rounded, rarely acute. Involucres: peduncle 4–25 mm; involucres erect or ascending, 13–23 mm; bracts 5, 50% connate, 15–20 mm, apex acute to widely ovate. Flowers 6 per involucre; perianth magenta, funnelform, 1.5–2.5 cm. Fruits light-brown, with 10 slender ribs visible when wet, widely obovoid to ellipsoid, 6–7.5 mm, tuberculate, glabrous or very sparsely puberulent, secreting mucilage most abundantly on ribs when wetted.
Phenology: Flowering late spring.
Habitat: Exposed slopes in canyons
Elevation: 400-500 m
Of conservation concern.
Mirabilis macfarlanei is in the Center for Plant Conservation’s National Collection of Endangered Plants.
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