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Bailey's ivesia, Owyhee ivesia

Bailey's ivesia, Owyhee ivesia

Habit Plants green, ± tufted, often forming hanging clumps, sometimes rosetted.
Stems

pendent or prostrate to ascending, 0.5–2(–2.5) dm.

Basal leaves

sheathing base sparsely glandular abaxially, otherwise glabrous.

planar, 3–12(–18) cm; sheathing base not or sparsely strigose abaxially;

petiole 1–8 cm;

lateral leaflets 2–6(–10) per side, separate to slightly overlapping distally, ovate or obovate to flabellate, 4–15(–25) mm, incised 1/4–3/4 to base into 3–11(–15) ovate to oblanceolate teeth or lobes, apex not setose, surfaces ± sparsely short-pilose or hirsute, ± glandular;

terminal leaflets ± distinct.

Cauline leaves

1–2;

blade reduced.

Inflorescences

(1–)5–40-flowered, open, (1–)1.5–8(–10) cm diam.

Pedicels

5–6+ mm at flowering, to 15(–30) mm in fruit.

2–15(–30) mm.

Flowers

5–40, 7–10 mm diam.;

epicalyx bractlets narrowly lanceolate, 0.8–1 mm, usually less than 1/2 as long as sepals;

hypanthium interior pale green or cream to maroon;

sepals (1.2–)1.5–2.5 mm;

petals white;

filaments white, anther margins reddish.

4–10 mm diam.;

epicalyx bractlets 5, narrowly lanceolate to ovate, 0.8–2.5 mm;

hypanthium patelliform, 0.5–2 × 2–4 mm;

sepals (1.2–)1.5–4 mm, acute;

petals white or pale yellow, oblanceolate to narrowly spatulate, 1.5–2.5 mm;

stamens 5, filaments 0.5–1.1 mm, anthers yellow, sometimes with reddish margins, oblong, 0.4–0.7 mm;

carpels (1–)3–8, styles 0.9–1.8 mm.

Achenes

± 2 mm, rugose.

greenish white to light tan, 1.5–2 mm, smooth or rugose, ± carunculate.

2n

= 28.

Ivesia baileyi var. beneolens

Ivesia baileyi

Phenology Flowering summer.
Habitat Crevices on north-facing cliffs or similarly protected sites in canyons and rocky outcrops mainly of volcanic origin, in sagebrush communities, conifer woodlands
Elevation 1000–2600 m (3300–8500 ft)
Distribution
from FNA
CA; ID; NV; OR
[BONAP county map]
from FNA
CA; ID; NV; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Variety beneolens occurs from Harney and Malheur counties, Oregon, to Modoc County, California, and to Elmore, Owyhee, and Twin Falls counties, Idaho, and Elko and Humboldt counties, Nevada. Plants are particularly common on the vertical sides of the river canyons that cut through the Owyhee Plateau. The variety also barely enters the Idaho Batholith on volcanic intrusions along the South Fork of the Boise River.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 2 (2 in the flora).

The two varieties accepted here were not recognized by D. D. Keck (1938), who instead treated Ivesia setosa as a variety of I. baileyi. Field investigations confirm that the three entities are reasonably distinct morphologically, with intergradation where their otherwise distinct ranges overlap in central Nevada.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Petals pale yellow; hypanthium interior yellow to golden; epicalyx bractlets ± 3/4 to as long as sepals; achenes smooth.
var. baileyi
1. Petals white; hypanthium interior pale green or cream to maroon; epicalyx bractlets usually less than 1/2 as long as sepals; achenes rugose.
var. beneolens
Source FNA vol. 9, p. 226. FNA vol. 9, p. 226.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae > Ivesia baileyi Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa
I. baileyi var. baileyi
I. aperta, I. argyrocoma, I. arizonica, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, I. longibracteata, I. lycopodioides, I. muirii, I. multifoliolata, I. paniculata, I. patellifera, I. pickeringii, I. pityocharis, I. pygmaea, I. rhypara, I. sabulosa, I. santolinoides, I. saxosa, I. sericoleuca, I. setosa, I. shockleyi, I. tweedyi, I. unguiculata, I. utahensis, I. webberi
Subordinate taxa
I. baileyi var. baileyi, I. baileyi var. beneolens
Synonyms Horkelia beneolens Potentilla baileyi
Name authority (A. Nelson & J. F. Macbride) Ertter: Syst. Bot. 14: 236. (1989) S. Watson: Botany (Fortieth Parallel), 90. (1871)
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