Ivesia lycopodioides |
Rosaceae subfam. rosoideae |
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club-moss ivesia, clubmoss mousetail |
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Habit | Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy. | Herbs, shrubs, or subshrubs. | ||||||||
Stems | decumbent to erect, 0.3–3 dm. |
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Leaves | alternate, rarely opposite, pinnately compound, sometimes simple or palmately compound; stipules present, rarely absent. |
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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. |
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Cauline leaves | 0–2(–3), not paired. |
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Inflorescences | 3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.; glomerules usually 1. |
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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. |
torus usually enlarged, sometimes small or absent; carpels 1–260(–450), distinct, free, styles distinct, rarely connate (Roseae); ovules 1(or 2), collateral (Rubeae) or superposed (Fallugia, Filipendula). |
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Fruits | achenes or aggregated achenes sometimes with fleshy, urn-shaped hypanthium or enlarged torus, sometimes aggregated drupelets; styles persistent or deciduous, not elongate (elongate but not plumose in Geum). |
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Achenes | greenish tan to light brown, 1.2–1.5 mm. |
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x | = 7(8). |
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Ivesia lycopodioides |
Rosaceae subfam. rosoideae |
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Distribution |
CA; NV
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North America; Mexico; Central America; South America; West Indies; Bermuda; Eurasia; Africa; Atlantic Islands; Indian Ocean Islands; Pacific Islands; Australia |
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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.) |
Variation in the number of genera in subfam. Rosoideae is due to differences in generic delimitation between D. Potter et al. (2007) and the authors of some Potentilleae genera. Cyanogenic glycosides and sorbitol are absent in the subfamily. Tribes 6, genera 28–35, species ca. 1600 (6 tribes, 26 genera, 302 species, including 1 hybrid, in the flora) (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. 23. | ||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae | ||||||||
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Subordinate taxa | ||||||||||
Synonyms | Potentilla lycopodioides | |||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865) | Arnott: Botany, 107. (1832) | ||||||||
Web links |