Flora of North America species comparison

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Ivesia lycopodioides var. lycopodioides

Ivesia lycopodioides var. megalopetala
Photo is of parent taxon

clubmoss ivesia, clubmoss mousetail
Photo is of parent taxon

clubmoss ivesia, clubmoss mousetail, Rock Creek or big-petal ivesia
Stems

decumbent to ascending, 0.3–1(–1.5) dm.

ascending to erect, 1–3 dm.
Basal leaves

1–7 cm;

leaflets tightly overlapping, glabrous or sparsely short-hirsute, lobes ± orbiculate, ± 1 mm, apical setae 0(–0.5) mm.

4–15 cm;

leaflets loosely overlapping, ± glabrous or sparsely short-hirsute, lobes linear to oblanceolate, 2–8 mm, apical setae 0–0.5 mm.
Cauline leaves

0–1.

1–2(–3).
Inflorescences

usually ± capitate, 3–15(–20)-flowered, 0.5–1.5(–2) cm diam.

± open to congested, sometimes subcapitate, 5–20(–25)-flowered, 1–2.5(–3.5) cm diam.
Flowers

6–9 mm diam.;

petals obovate, 2–3 × 1 mm;

filaments 0.8–1.2 mm;

styles 1–2 mm.

8–12 mm diam.;

petals broadly obovate, 3–5 × 2–4 mm;

filaments (1–)1.5–2 mm;

styles 2.5–3 mm.
2n

= 28.

Ivesia lycopodioides var. lycopodioides

Ivesia lycopodioides var. megalopetala
Phenology Flowering summer. Flowering summer.
Habitat Dry rocky flats or slopes, fellfields, in high-elevation sagebrush communities, subalpine to alpine conifer woodlands, alpine tundra Wet meadows, in sagebrush communities, subalpine conifer woodlands, alpine tundra
Elevation 3000–4000 m (9800–13100 ft) 2300–3700 m (7500–12100 ft)
Distribution
from FNA
CA; NV
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

Variety lycopodioides occurs in the Sierra Nevada from El Dorado and Alpine to Fresno counties, and on the Sweetwater Mountains of Mono County, California. The voucher reported by D. D. Keck (1938) from the Carson Range of Washoe County, Nevada, has not been located for confirmation. Of the three varieties, var. lycopodioides tends to have plants with the smallest leaflet lobes (ca. 1 mm) which lack apical setae. Plants also have more consistently simple caudices bearing a single rosette of glabrous or sparsely hairy leaves atop an enlarged, fleshy taproot.

(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.)
Source FNA vol. 9, p. 232. FNA vol. 9, p. 233.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia > Ivesia lycopodioides Rosaceae > subfam. Rosoideae > tribe Potentilleae > Ivesia > sect. Ivesia > Ivesia lycopodioides
Sibling taxa
I. lycopodioides var. megalopetala, I. lycopodioides var. scandularis
I. lycopodioides var. lycopodioides, I. lycopodioides var. scandularis
Synonyms Horkelia gordonii var. megalopetala, I. lycopodioides subsp. megalopetala, Potentilla lycopodioides var. megalopetala
Name authority unknown (Rydberg) Ertter & Reveal: Novon 17: 324. (2007)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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