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clubmoss ivesia, clubmoss mousetail, White Mountains ivesia

club-moss ivesia, clubmoss mousetail

Habit Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy.
Stems

decumbent to ascending, 0.5–1.5 dm.

decumbent to erect, 0.3–3 dm.

Basal leaves

3–8 cm;

leaflets tightly overlapping, short-hirsute, lobes obovate, 1–3 mm, apical setae (0–)0.5–1(–2) mm.

tightly to loosely cylindric, 1–15 cm; sheathing base glabrous abaxially;

petiole 0.5–4 cm, hairs 0.2–1 mm;

leaflets 10–35 per side, 1–8 mm, glabrous or short-hirsute, minutely glandular, lobes (2–)4–8(–10), linear to obovate or ± orbiculate, apex sometimes setose.

Cauline leaves

0–1.

0–2(–3), not paired.

Inflorescences

usually ± capitate, 3–15(–20)-flowered, 1–2(–3) cm diam.

3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.;

glomerules usually 1.

Pedicels

(0.5–)1–7(–11) mm.

Flowers

6–12 mm diam.;

petals broadly obovate, 3–5 × 2–3 mm;

filaments 1.2–1.5 mm;

styles 2–3 mm.

6–12 mm diam.;

epicalyx bractlets oblong to oval, 0.8–2.5(–3) mm;

hypanthium shallowly cupulate, 1–2 × 2.5–5 mm;

sepals (1.8–)2–4(–4.5) mm, obtuse to acute;

petals golden yellow, obovate, 2–5 mm;

stamens 5, filaments 0.8–2 mm, anthers yellow, 0.6–0.8 mm;

carpels (5–)8–15(–18), styles 1–3 mm.

Achenes

greenish tan to light brown, 1.2–1.5 mm.

Ivesia lycopodioides var. scandularis

Ivesia lycopodioides

Phenology Flowering summer.
Habitat Moist slopes, fellfields, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands, alpine tundra
Elevation 3000–4000 m (9800–13100 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA; NV
[WildflowerSearch map]
[BONAP county map]
Discussion

Variety scandularis is the only variety that occurs in the White Mountains of Inyo and Mono counties, California; scattered populations occur also on the eastern side of the Sierra Nevada. Leaflet lobes are intermediate in size between those of the other two varieties and usually are tipped with a single bristle to 2 mm.

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

Varieties 3 (3 in the flora).

The three varieties of Ivesia lycopodioides are for the most part readily distinguished, though intergradation is known. The high-elevation var. lycopodioides extends farthest north; var. scandularis is the only variety in the White Mountains. Variety megalopetala is found mostly at somewhat lower (subalpine) elevations and generally has a more southern range.

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

Key
1. Leaflets short-hirsute, apical setae (0–)0.5–1(–2) mm; White Mountains and c Sierra Nevada.
var. scandularis
1. Leaflets glabrous or sparsely short-hirsute, apical setae 0–0.5 mm; Sierra Nevada and Sweetwater Mountains
→ 2
2. Leaflet lobes ± orbiculate, ± 1 mm; petals 2–3 × 1 mm.
var. lycopodioides
2. Leaflet lobes linear to oblanceolate, 2–8 mm; petals 3–5 × 2–4 mm.
var. megalopetala
Source FNA vol. 9, p. 232. FNA vol. 9, p. 232.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia > Ivesia lycopodioides Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia
Sibling taxa
I. lycopodioides var. lycopodioides, I. lycopodioides var. megalopetala
I. aperta, I. argyrocoma, I. arizonica, I. baileyi, I. callida, I. campestris, I. cryptocaulis, I. gordonii, I. jaegeri, I. kingii, I. longibracteata, 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. lycopodioides var. lycopodioides, I. lycopodioides var. megalopetala, I. lycopodioides var. scandularis
Synonyms Horkelia scandularis, I. lycopodioides subsp. scandularis, Potentilla lycopodioides var. scandularis Potentilla lycopodioides
Name authority (Rydberg) Ertter & Reveal: Novon 17: 324. (2007) A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865)
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