Ivesia kingii

S. Watson

Botany (Fortieth Parallel), 91, 448. 1871.

Conservation concernEndemicIllustrated
Synonyms: Potentilla kingii (S. Watson) Greene
Treatment appears in FNA Volume 9. Treatment on page 238. Mentioned on page 176, 237, 241.

Plants usually grayish green to silvery, often glaucous; glands sparse. Stems usually prostrate-decumbent to ascending, sometimes ± erect, 1–4 (–5.5) dm. Basal leaves 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. Cauline leaves 4–15. Inflorescences 5–100-flowered, 1–12 cm diam., flowers arranged individually and/or in few to several loose glomerules of 2–10 flowers. Pedicels (1–) 2–20 (–25) mm. Flowers 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. Achenes light-brown, 1.8–2.5 mm.

Discussion

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.

Selected References

None.

Key

1 Leaflets individually ± distinguishable, loosely to tightly overlapping; caudices simple or few branched; Great Basin, ec California, Nevada, w Utah. Ivesia kingii var. kingii
1 Leaflets mostly not individually distinguishable, tightly overlapping; caudices often much branched; n Mojave Desert, Nevada. Ivesia kingii var. eremica

No values specified."dm" is not declared as a valid unit of measurement for this property.

... more about "Ivesia kingii"
not carunculate +
light-brown +
1.8mm +  and 2.5mm +
white +  and cream +
less as-long-as to longer than wide +  and more +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Barbara Ertter +  and James L. Reveal +
S. Watson +
compound +  and simple +
opposite +  and alternate +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
strigose +  and glabrous +
Unguiculatae +
20 cm200 mm <br />0.2 m <br /> (25 cm250 mm <br />0.25 m <br />) +
narrowly oblong +  and filiform planar +
0.5 cm5 mm <br />0.005 m <br /> (20 cm200 mm <br />0.2 m <br />) +
reduced +
elongate +
free +  and distinct +
branched +  and simple +
Calif. +, Nev. +  and Utah +
not +  and aggregated +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
lanceolate +  and elliptic or ovate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
2 +  and 10 +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
obliquely ovoid +  and reniform +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
loose +  and capitate +
few +  and several +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
ascending +  and appressed +
sparse to dense +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1 cm10 mm <br />0.01 m <br /> (12 cm120 mm <br />0.12 m <br />) +
crassinucellate +
opposite +  and alternate +
winter-marcescent +
deciduous +  and persistent +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
, +  and distinct +
not +  and distinguishable +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
narrowly oblanceolate +  and obovate +
verticillate +
toothed +, unlobed +  and lobed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 (?) +  and 4 (?) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
free +  and distinct +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
adnate +, free +, connate +  and distinct +
Botany (Fortieth Parallel), +
not arillate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
purple-suffused +
persistent +
free +  and distinct +
erect +  and spreading +
narrowly acute +  and acuminate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Conservation concern +, Endemic +  and Illustrated +
free +  and distinct +
branched +  and simple +
reddish +, grayish +  and green +
erect +, usually prostrate-decumbent +  and ascending +
2 +  and 20 +
palmate +  and pinnate +
linear to lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
deciduous +
distinct +
subterminal +
filiform +
rough-thickened +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Potentilla kingii +
Ivesia kingii +
Ivesia sect. Unguiculatae +
species +
glabrate +  and hairy +
inconspicuous +
stipelike +, elongate +, less flat +  and conic or turbinate +
enlarged +
tufted +  and rosetted +
usually grayish green +  and silvery +