Ivesia multifoliolata
Lloydia 1: 125. 1939.
Plants green. Stems ascending to erect, 2–6 dm. Basal leaves 6–25 (–30) cm; sheathing base minutely glandular abaxially; petiole 0.5–8 (–10) cm; leaflets 12–30 per side, obovate to broadly cuneate, 5–12 (–15) mm, incised 1/3–1/2 to base into 3–5 oblong to ovate teeth, sometimes entire, sparsely short-strigose to villous, sometimes glabrate. Inflorescences (5–) 8–60-flowered, 2–12 cm diam. Pedicels 5–30 (–35) mm. Flowers 9–12 mm diam.; epicalyx bractlets narrowly lanceolate to lanceolate, 1–2 mm; hypanthium interior brick to blood-red or golden, 0.5–1.5 × 3–5 mm; sepals 3–4.5 mm, base brick to blood-red adaxially, apex acute to acuminate; petals brick to blood-red, linear to oblanceolate or narrowly elliptic, 2–3.5 mm; stamens 5, filaments 1.3–2 mm, anthers maroon, oblong, 0.6–0.9 mm; carpels 1–5, styles 2–3 mm. Achenes brown, 2–2.5 mm. 2n = 28.
Phenology: Flowering summer.
Habitat: Dry flats and slopes, on gravelly volcanic or sandstone soil, often along seasonal stream courses, in oak and conifer woodlands
Elevation: 1800–2400 m
Discussion
Of conservation concern.
Ivesia multifoliolata is found between the Grand Canyon and Mogollon Rim in northern Arizona. It is both the only species of the genus with red petals and the only one that overlaps the range of the red-petaled Potentilla sect. Rubrae.
Selected References
None.
Lower Taxa
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