Ivesia lycopodioides |
Ivesia lycopodioides var. megalopetala |
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club-moss ivesia, clubmoss mousetail |
clubmoss ivesia, clubmoss mousetail, Rock Creek or big-petal ivesia |
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Habit | Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy. | |||||||||
Stems | decumbent to erect, 0.3–3 dm. |
ascending to erect, 1–3 dm. |
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Basal leaves | 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. |
4–15 cm; leaflets loosely overlapping, ± glabrous or sparsely short-hirsute, lobes linear to oblanceolate, 2–8 mm, apical setae 0–0.5 mm. |
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Cauline leaves | 0–2(–3), not paired. |
1–2(–3). |
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Inflorescences | 3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.; glomerules usually 1. |
± open to congested, sometimes subcapitate, 5–20(–25)-flowered, 1–2.5(–3.5) cm diam. |
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Pedicels | (0.5–)1–7(–11) mm. |
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Flowers | 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. |
8–12 mm diam.; petals broadly obovate, 3–5 × 2–4 mm; filaments (1–)1.5–2 mm; styles 2.5–3 mm. |
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Achenes | greenish tan to light brown, 1.2–1.5 mm. |
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Ivesia lycopodioides |
Ivesia lycopodioides var. megalopetala |
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Phenology | Flowering summer. | |||||||||
Habitat | Wet meadows, in sagebrush communities, subalpine conifer woodlands, alpine tundra | |||||||||
Elevation | 2300–3700 m (7500–12100 ft) | |||||||||
Distribution |
CA; NV
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CA |
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Discussion | 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.) |
Variety megalopetala is known from the southern Sierra Nevada from Mono and Tuolumne to Tulare counties. It tends to be the largest of the three varieties, with plants having larger flowers and longer and narrower leaflet lobes, which commonly have apical setae to 0.5 mm. Variety megalopetala is also more likely to occur in wet meadows along subalpine streams. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 232. | FNA vol. 9, p. 233. | ||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia > Ivesia lycopodioides | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Potentilla lycopodioides | Horkelia gordonii var. megalopetala, I. lycopodioides subsp. megalopetala, Potentilla lycopodioides var. megalopetala | ||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865) | (Rydberg) Ertter & Reveal: Novon 17: 324. (2007) | ||||||||
Web links |