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Ivesia longibracteata

Castle Crags ivesia, longbract mousetail

Kingston Mountain mousetail, Kingston Mountains. ivesia

Habit Plants green, ± tufted; taproot ± stout, not fleshy. Plants green, ± tufted, often forming hanging clumps, sometimes rosetted.
Stems

ascending to erect, 0.3–1.2 dm.

pendent or prostrate to ascending, (0.5–)1–2 dm.

Basal leaves

weakly planar to loosely ± cylindric, (0.5–)2–4(–6) cm; sheathing base glandular abaxially, otherwise glabrous;

petiole 0.5–2 cm, hairs 0.2–1 mm;

leaflets 5–6 per side, 2–6 mm, ± short-hirsute, glandular-puberulent, lobes 2–7, oblanceolate to spatulate or obovate, apex not setose.

planar, (2–)5–15 cm; sheathing base not strigose abaxially;

petiole 1–5 cm;

lateral leaflets (1–)2–3(–4) per side, separate, obovate to orbiculate, 5–20 mm, incised 1/4–1/2 to base into 5–9 broadly ovate teeth, apex not setose, surfaces short-pilose, ± glandular;

terminal leaflets distinct.

Cauline leaves

1–3, not paired.

(0–)2;

blade well developed.

Inflorescences

3–14-flowered, 1–2.5 cm diam.;

glomerules 1.

(1–)3–20(–35)-flowered, open, (0.5–)1.5–4(–6) cm diam.

Pedicels

1.5–6 mm.

5–20(–30) mm.

Flowers

8–10 mm diam.;

epicalyx bractlets linear to narrowly lanceolate or elliptic, 2.5–5 mm, longer than sepals;

hypanthium shallowly cupulate, 0.5–1 × 2–3 mm;

sepals 1.5–2.5 mm, ± acute;

petals pale yellow, linear to narrowly oblanceolate, 1.5–2.5 mm;

stamens 5, filaments 0.7–1.3 mm, anthers yellow, 0.5–0.8 mm;

carpels 6–11, styles 1–1.5 mm.

7–10 cm diam.;

epicalyx bractlets 0;

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

sepals 2–4 mm, broadly acute;

petals yellow, narrowly oblanceolate, 2–3 mm;

stamens 5–10, filaments 0.6–1.2(–1.5) mm, anthers yellow, oblong, 0.8–1 mm;

carpels 4–10, styles 1.5–2 mm.

Achenes

cream to light tan, 1.2–1.5 mm.

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

Ivesia longibracteata

Ivesia patellifera

Phenology Flowering summer. Flowering summer.
Habitat Dry crevices of granodioritic igneous rock, in mixed oak-conifer woodlands Dry, rocky outcrops of limestone, usually crevices of more or less vertical protected cliffs or boulders, in conifer woodlands
Elevation 1200–1400 m (3900–4600 ft) 1400–2200 m (4600–7200 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Of conservation concern.

Ivesia longibracteata is known only from the Castle Crags area of Shasta County. The epithet alludes to a diagnostic characteristic unique in the genus: the epicalyx bractlets are longer than the sepals. The plants grow on vertical rock faces, a habitat more characteristic of sect. Setosae; however, the stems are ascending to erect and do not form hanging clumps, and the pedicels are not curved in fruit.

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

Of conservation concern.

Ivesia patellifera is confined to crevices in steep wash and canyon walls in the Kingston Mountains of San Bernardino County.

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

Source FNA vol. 9, p. 236. FNA vol. 9, p. 224.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae
Sibling taxa
I. aperta, I. argyrocoma, I. arizonica, I. baileyi, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, 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. baileyi, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, I. longibracteata, I. lycopodioides, I. muirii, I. multifoliolata, I. paniculata, 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 patellifera
Name authority Ertter: Syst. Bot. 14: 233, fig. 1. (1989) (J. T. Howell) Ertter: Syst. Bot. 14: 232. (1989)
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