Flora of North America species comparison

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Ivesia callida

Tahquitz ivesia, Tahquitz mousetail
Habit Plants green, ± tufted to matted, often forming hanging clumps, sometimes rosetted.
Stems

usually pendent or prostrate to ascending, sometimes nearly erect, 0.2–1.5 dm.
Basal leaves

± loosely cylindric to weakly planar, 1–7 cm; sheathing base sparsely strigose abaxially;

petiole 0.3–3 cm;

lateral leaflets (1–)5–8 per side, slightly overlapping, elliptic to flabellate, 2–6(–7) mm, incised nearly to base into (0–)2–4 oblanceolate to elliptic lobes, apex sometimes ± setose, surfaces loosely long-strigose, sparsely glandular;

terminal leaflets indistinct.
Cauline leaves

(1–)2;

blade reduced.
Inflorescences

1–10(–15)-flowered, open, (0.5–)2–5 cm diam.
Pedicels

5–15 mm.
Flowers

7–10 mm diam.;

epicalyx bractlets 5, narrowly lanceolate, 1.5–3 mm;

hypanthium patelliform, 0.5–1 × 2–3 mm;

sepals 2–3.5 mm, acute;

petals white, obovate, 2–3.5 mm;

stamens 20, filaments 1.5–3 mm, anthers maroon, subrotund, 0.2–0.3 mm;

carpels 4–8, styles 1.5–1.8 mm.
Achenes

greenish white to light tan, 1.5 mm, smooth to lightly rugose, ± carunculate.

Ivesia callida
Phenology Flowering summer.
Habitat Crevices of dry, rocky outcrops of granite, sometimes more or less vertical protected cliffs, in montane conifer woodlands
Elevation 2400–2500 m (7900–8200 ft)
Distribution
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Ivesia callida occurs in the Tahquitz Peak area of the San Jacinto Wilderness Area, San Jacinto Mountains, Riverside County, where two populations are known (K. Berg 1983). Plants form tight mats in horizontal crevices and loose pendent clumps on vertical rock faces.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 224.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa
I. aperta, I. argyrocoma, I. arizonica, I. baileyi, 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
Synonyms Potentilla callida
Name authority (H. M. Hall) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 286. (1908)
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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