Flora of North America species comparison

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Ivesia argyrocoma var. argyrocoma
Photo is of parent taxon

silver-hair ivesia
Habit Plants silvery; glands obscured.
Stems

prostrate to ascending, (0.3–)1–2.5(–3) dm.
Basal leaves

4–8(–10) cm; sheathing base sparsely to densely strigose abaxially;

stipules lanceolate, 1–2 mm;

petiole (0.5–)1–3 cm, hairs abundant, spreading, (1–)3–5 mm;

leaflets 25–35 per side, tightly overlapping, (1–)2–3.5 mm, lobes 2–3, elliptic to obovate or oval, hairs dense, appressed to ascending, 0.5–1.5 mm.
Cauline leaves

(1–)2–3.
Inflorescences

(5–)10–30-flowered, (1–)1.5–4(–6) cm diam., flowers arranged in 1–several ± tight glomerules of 10–20(–30) flowers.
Pedicels

1–3 mm.
Flowers

7–9 mm diam.;

epicalyx bractlets mostly linear to narrowly ovate, 0.8–2(–2.5) mm;

hypanthium cupulate, (1–)1.5–2 × (2–)2.5–3(–3.5) mm, 1/2–2/3 as deep as wide;

sepals sometimes purple-suffused, 2–3(–4) mm, acute;

petals white, obovate, (2–)3–4(–4.5) mm;

stamens 20, filaments flattened, 0.6–1.3 mm, anthers yellowish, 0.3–0.5 mm;

carpels 4–8, styles 1.5–2.2 mm.
Achenes

brown, (1.5–)2–2.5 mm.

Ivesia argyrocoma var. argyrocoma
Phenology Flowering summer.
Habitat Dry meadows, gravelly soil, in montane conifer woodlands
Elevation 1400–2300 m (4600–7500 ft)
Distribution
from FNA
CA
Discussion

Of conservation concern.

Variety argyrocoma is found only on so-called pebble plains in the eastern San Bernardino Mountains, San Bernardino County. The filaments are significantly more flattened than those of other species of Ivesia and approach those that characterize Horkelia.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 242.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae > Ivesia argyrocoma
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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