Ivesia argyrocoma |
Ivesia lycopodioides |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|
silver-hair ivesia, silverhair mousetail |
club-moss ivesia, clubmoss mousetail |
|||||||||
Habit | Plants green, usually rosetted, sometimes ± tufted; taproot fusiform, fleshy. | |||||||||
Stems | decumbent to erect, 0.3–3 dm. |
|||||||||
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. |
|||||||||
Cauline leaves | 0–2(–3), not paired. |
|||||||||
Inflorescences | 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.; 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 argyrocoma |
Ivesia lycopodioides |
|||||||||
Distribution |
CA; nw Mexico
|
CA; NV
|
||||||||
Discussion | Varieties 2 (1 in the flora). Plants from the central Sierra San Pedro Mártir in northern Baja California belong to var. moranii Ertter & Reveal, which may be distinguished by its compact stature (to 0.5 dm), densely villous basal stipules 2–4 mm, decumbent stems 2–7 cm that are stipitate-glandular under the villous indumentum, and solitary, loosely congested cyme. The petals are oblanceolate to narrowly obovate and 2.5–3.5 mm. The grayish, faintly mottled achenes are 1.3–2 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 |
|
|||||||||
Source | FNA vol. 9, p. 242. | FNA vol. 9, p. 232. | ||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Unguiculatae | Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Horkelia argyrocoma, Potentilla argyrocoma | Potentilla lycopodioides | ||||||||
Name authority | (Rydberg) Rydberg: in N. L. Britton et al., N. Amer. Fl. 22: 284. (1908) | A. Gray: Proc. Amer. Acad. Arts 6: 530. (1865) | ||||||||
Web links |