Ivesia lycopodioides |
Ivesia jaegeri |
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club-moss ivesia, clubmoss mousetail |
Jaeger's ivesia, Jaeger's mousetail |
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Habit | Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy. | Plants green, ± tufted to ± matted, often forming hanging clumps, sometimes rosetted. | ||||||||
Stems | decumbent to erect, 0.3–3 dm. |
pendent or prostrate to ascending, 0.3–1.5 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. |
± loosely cylindric to weakly planar, 2–8(–10) cm; sheathing base not or sparsely strigose abaxially; petiole 0.5–4 cm; lateral leaflets (1–)4–6(–8) per side, ± overlapping at least distally, ± flabellate, 2–6(–7) mm, incised nearly to base into 3–6 oblanceolate to narrowly obovate lobes, apex not or scarcely setose, surfaces ± sparsely short-pilose, ± glandular; terminal leaflets indistinct. |
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Cauline leaves | 0–2(–3), not paired. |
(1–)2; blade well developed. |
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Inflorescences | 3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.; glomerules usually 1. |
(1–)3–15-flowered, open, (0.5–)1.5–4(–7) cm diam. |
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Pedicels | (0.5–)1–7(–11) mm. |
5–30 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. |
5–11 mm diam.; epicalyx bractlets 5, lanceolate, 1–2 mm; hypanthium patelliform, 1 × 2–4 mm; sepals 2–3 mm, ± acute; petals yellow, narrowly oblanceolate, 1.5–2 mm; stamens 20, filaments 1–1.5(–1.8) mm, anthers yellow, subrotund, 0.2–0.3 mm; carpels 3–8, styles 1.5–2 mm. |
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Achenes | greenish tan to light brown, 1.2–1.5 mm. |
tan to light brown, 1–2 mm, ± rugose, ± carunculate. |
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Ivesia lycopodioides |
Ivesia jaegeri |
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Phenology | Flowering summer. | |||||||||
Habitat | Dry, rocky outcrops of limestone origin, usually crevices of more or less vertical protected cliffs or boulders, mainly in conifer woodlands | |||||||||
Elevation | 1600–3600 m (5200–11800 ft) | |||||||||
Distribution |
CA; NV
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CA; NV |
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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.) |
Of conservation concern. Ivesia jaegeri is known only from the Spring Mountains, Clark County, Nevada, and the Clark Mountains, San Bernardino County, California. (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. 223. | ||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Setosae | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Potentilla lycopodioides | Potentilla jaegeri | ||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865) | Munz & I. M. Johnston: Bull. Torrey Bot. Club 56: 165. (1929) | ||||||||
Web links |