Flora of North America species comparison

The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Ivesia webberi

Ivesia utahensis

Webber's ivesia, wire ivesia, wire mousetail

Utah ivesia, Utah mousetail
Habit Plants ± green, ± rosetted; taproot slender to ± stout, not fleshy. Plants green, rosetted to tufted; taproot proximally enlarged, not fleshy.
Stems

decumbent to ascending, 0.5–1.5(–1.8) dm.

prostrate to ascending, 0.5–1.5(–2) dm.
Basal leaves

loosely ± cylindric, 3–7(–10) cm; sheathing base ± strigose abaxially;

petiole 0.5–5(–6) cm, hairs 2–4 mm;

leaflets 4–8(–10) per side, (0.5–)3–8(–10) mm, loosely long-strigose or -villous and short-hirsute, ± glandular, lobes 2–5(–12), linear to lanceolate, apex not setose.

± tightly cylindric, 2–7(–9) cm; sheathing base glabrous abaxially;

petiole 0.5–2 cm, hairs 0.5–1 mm;

leaflets 15–20 per side, 2–4 mm, glabrate or sparsely short-hirsute, sparsely to densely glandular, lobes (2–)3–8, narrowly oblanceolate to obovate, apex not setose.
Cauline leaves

2, paired.

(0–)1, not paired.
Inflorescences

5–15(–25)-flowered, 1.5–3(–6) cm diam.;

glomerules 1.

(5–)10–30-flowered, 1–2.5(–5) cm diam.;

glomerules 1–few.
Pedicels

(0.5–)1–8(–13) mm.

1–7 mm.
Flowers

9–12 mm diam.;

epicalyx bractlets linear, 1.2–3 mm;

hypanthium cupulate, 1–2(–2.5) × 2.5–5 mm;

sepals 2.5–4.5(–5.5) mm, acute;

petals yellow, narrowly oblanceolate, 2–3(–4) mm;

stamens 5, filaments 1.8–2.5(–3) mm, anthers yellow, (0.8–)1–1.6 mm;

carpels 3–8, styles 1.8–2.2 mm.

7–9 mm diam.;

epicalyx bractlets narrowly oblong to oval, 0.8–2 mm;

hypanthium shallowly cupulate, (1–)1.5–2 × 2.5–3.5 mm;

sepals (1.8–)2–3 mm, acute;

petals white, sometimes pink-tinged, oblanceolate to spatulate, 1.8–3 mm;

stamens 5, filaments 1.3–1.8 mm, anthers orangish to reddish brown, 0.4–0.6 mm;

carpels (1–)2–4, styles 1.5–2 mm.
Achenes

light brown, often mottled darker brown, 1.9–2.5 mm.

yellowish green to light tan or gray-brown, 1.7–1.9 mm.

Ivesia webberi

Ivesia utahensis
Phenology Flowering late spring–early summer. Flowering summer.
Habitat Dry flats and slopes, in sagebrush communities, conifer woodlands Talus slopes, bare ridges, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands
Elevation (1300–)1500–1900 m ((4300–)4900–6200 ft) 3200–3700 m (10500–12100 ft)
Distribution
from FNA
CA; NV
[BONAP county map]
from FNA
UT
[BONAP county map]
Discussion

Of conservation concern.

Ivesia webberi is known only from the eastern foothills of the northern Sierra Nevada and scattered ranges to the east in California and adjacent Nevada. It is among the more distinctive species in the genus and is only tentatively placed in sect. Ivesia. The leaflets are loosely incised into slender, sparsely villous segments, and the two cauline leaves are paired with dissected stipules. Previous reports of the stems and inflorescence branches being glandular-puberulent are due to a misinterpretation of the minute pustulose bases associated with the villous indumentum as being enlarged glands.

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

Of conservation concern.

Ivesia utahensis is known from the Wasatch and adjacent Uinta Mountains in northern Utah. The species stands as the white-petaled counterpart to the yellow-petaled Sierran I. lycopodioides, possibly indicating a common ancestral stock that was once more continuous across the Great Basin.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 236. FNA vol. 9, p. 233.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia
Sibling taxa
I. aperta, I. argyrocoma, 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. aperta, I. argyrocoma, 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. webberi
Synonyms Potentilla webberi Potentilla utahensis
Name authority A. Gray: Proc. Amer. Acad. Arts 10: 71. (1874) S. Watson: Proc. Amer. Acad. Arts 17: 371. (1882)
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).



Type/paste one or more Latin names into the boxes above; matching taxa will show up below the box as you type. You can use the up/down arrow keys to move through the list.

(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Apiaceae, Boraginaceae, and Polemoniaceae.)

Choose a data source: Flora of North America

The species comparison tool is brought to you by:
Northwest Wildflowers