Flora of North America species comparison

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Ivesia argyrocoma

Ivesia baileyi

silver-hair ivesia, silverhair mousetail

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

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

2–15(–30) mm.
Flowers

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

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

Ivesia argyrocoma

Ivesia baileyi
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; NV; OR
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[BONAP county map]
Discussion

Varieties 2 (1 in the flora).

Plants from the central Sierra San Pedro Mártir in northern Baja California belong to var. moranii Ertter & Reveal, which may be distinguished by its compact stature (to 0.5 dm), densely villous basal stipules 2–4 mm, decumbent stems 2–7 cm that are stipitate-glandular under the villous indumentum, and solitary, loosely congested cyme. The petals are oblanceolate to narrowly obovate and 2.5–3.5 mm. The grayish, faintly mottled achenes are 1.3–2 mm.

(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. 242. FNA vol. 9, p. 226.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa
I. aperta, I. arizonica, I. baileyi, 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
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. argyrocoma var. argyrocoma
I. baileyi var. baileyi, I. baileyi var. beneolens
Synonyms Horkelia argyrocoma, Potentilla argyrocoma Potentilla baileyi
Name authority (Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908) S. Watson: Botany (Fortieth Parallel), 90. (1871)
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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