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FNA | Family List | FNA Vol. 9 | Rosaceae | Horkeliella

1. Horkeliella congdonis (Rydberg) Rydberg in N. L. Britton et al., N. Amer. Fl. 22: 283. 1908.

Congdon’s horkeliella or false horkelia

Horkelia congdonis Rydberg, Bull. Torrey Bot. Club 26: 543. 1899; H. purpurascens S. Watson subsp. congdonis (Rydberg) Abrams; Ivesia purpurascens (S. Watson) D. D. Keck subsp. congdonis (Rydberg) D. D. Keck; Potentilla purpurascens (S. Watson) Greene var. congdonis (Rydberg) Jepson

Plants green, non-glandular hairs sparse, not obscuring abundant stipitate-glandular ones. Basal leaves (5–)8–25(–27) cm; petiole 4–10 cm; leaflets 25–35 per side, 2–6 mm, divided into 5–10 ultimate segments, sparsely villous, more densely so marginally, minutely orangish sessile-glandular. Cauline leaves 2–7, 2–10 cm. Inflorescences ± congested. Pedicels usually 2 mm (proximalmost to 20 mm). Flowers 15 mm diam.; epicalyx bractlets lanceolate, 2.5–5(–6) mm; sepals 4–8(–9) mm, villous, short-stipitate-glandular; petals narrowly oblong-oblanceolate, 3–6(–6.5) mm; filaments 1.5–3 mm, filament opposite center of sepal longer than those on either side, anthers 1 mm; styles 2–5 mm.

Flowering late summer. Dry granitic meadows, in sagebrush communities, montane to subalpine conifer woodlands; 1500–3100 m; Calif.

Horkeliella congdonis is known from the eastern foothills and slopes of the Sierra Nevada northeast to the Sweetwater Mountains and the Glass Mountain area of Mono and northern Inyo counties. It generally forms dense clumps that are notably more glandular than H. purpurascens.


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