Ivesia lycopodioides |
Ivesia kingii |
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club-moss ivesia, clubmoss mousetail |
Ash Meadows ivesia, King's ivesia, King's mousetail |
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Habit | Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy. | Plants usually grayish green to silvery, often glaucous; glands sparse. | ||||||||||||
Stems | decumbent to erect, 0.3–3 dm. |
usually prostrate-decumbent to ascending, sometimes ± erect, 1–4(–5.5) 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. |
5–20 cm; sheathing base glabrous or densely strigose abaxially; stipules absent or linear to lanceolate, 1–4 mm; petiole 0.2–1.2 cm, hairs absent or sparse to dense, appressed or ascending, 0.5–2 mm; leaflets 15–60 per side, loosely to tightly overlapping, (1.8–)2–6(–8) mm, lobes (0–)2–4, narrowly oblanceolate to obovate, hairs absent or sparse to dense, ± appressed, 0.2–0.5(–1) mm. |
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Cauline leaves | 0–2(–3), not paired. |
4–15. |
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Inflorescences | 3–20(–25)-flowered, (0.5–)1–2.5(–3.5) cm diam.; glomerules usually 1. |
5–100-flowered, 1–12 cm diam., flowers arranged individually and/or in few to several loose glomerules of 2–10 flowers. |
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Pedicels | (0.5–)1–7(–11) mm. |
(1–)2–20(–25) 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.; epicalyx bractlets lanceolate to elliptic or ovate, (0.8–)1–2(–2.5) mm; hypanthium shallowly cupulate, 0.5–2 × 1.5–4 mm, ± 1/2 as deep as wide; sepals sometimes purple-suffused, 2–4(–5) mm, narrowly acute to acuminate; petals white, spatulate or obovate to orbiculate, (2.8–)3–5(–6) mm; stamens 20, filaments filiform, 1.5–2.5 mm, anthers white to cream, 0.3–0.6 mm; carpels 2–9, styles 2–2.5(–3) mm. |
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Achenes | greenish tan to light brown, 1.2–1.5 mm. |
light brown, 1.8–2.5 mm. |
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Ivesia lycopodioides |
Ivesia kingii |
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Distribution |
CA; NV
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CA; NV; UT
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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.) |
Varieties 2 (2 in the flora). Significant variation in habit, indument, leaflet lobing, and compactness of inflorescence can be found among and within populations of Ivesia kingii; no taxonomic structure has yet been discerned beyond the varieties recognized here. The variation within widespread var. kingii suggests that var. eremica resulted from a southward, late Pleistocene migration of a hairy phase of I. kingii with compact leaflets out of the Great Basin onto the northern edge of the Mojave Desert (J. L. Reveal 1980). Although densely hairy plants are encountered widely in the Great Basin, only in the Ash Meadows area of southernmost Nye County, the home of var. eremica, is there a consistently hairy phase. The leaflets of var. eremica are so tightly compacted that individual leaflets cannot be distinguished; in var. kingii, leaflets are individually distinct, though plants from Mineral County sometimes approach var. eremica in this regard. In the field, shoots of var. kingii arise directly from a taproot with the spreading branches flowing outwardly from a single point of attachment. In var. eremica, older, mature plants form compact mats with short, spreading caudex branches. (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. 238. | ||||||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Potentilla lycopodioides | Potentilla kingii | ||||||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865) | S. Watson: Botany (Fortieth Parallel), 91, 448. (1871) | ||||||||||||
Web links |