Ivesia argyrocoma var. argyrocoma

Treatment appears in FNA Volume 9. Treatment on page 242. Mentioned on page 243.

Plants silvery; glands obscured. Stems prostrate to ascending, (0.3–) 1–2.5 (–3) dm. Basal leaves 4–8 (–10) cm; sheathing base sparsely to densely strigose abaxially; stipules lanceolate, 1–2 mm; petiole (0.5–) 1–3 cm, hairs abundant, spreading, (1–) 3–5 mm; leaflets 25–35 per side, tightly overlapping, (1–) 2–3.5 mm, lobes 2–3, elliptic to obovate or oval, hairs dense, appressed to ascending, 0.5–1.5 mm. Cauline leaves (1–) 2–3. Inflorescences (5–) 10–30-flowered, (1–) 1.5–4 (–6) cm diam., flowers arranged in 1–several ± tight glomerules of 10–20 (–30) flowers. Pedicels 1–3 mm. Flowers 7–9 mm diam.; epicalyx bractlets mostly linear to narrowly ovate, 0.8–2 (–2.5) mm; hypanthium cupulate, (1–) 1.5–2 × (2–) 2.5–3 (–3.5) mm, 1/2–2/3 as deep as wide; sepals sometimes purple-suffused, 2–3 (–4) mm, acute; petals white, obovate, (2–) 3–4 (–4.5) mm; stamens 20, filaments flattened, 0.6–1.3 mm, anthers yellowish, 0.3–0.5 mm; carpels 4–8, styles 1.5–2.2 mm. Achenes brown, (1.5–) 2–2.5 mm.


Phenology: Flowering summer.
Habitat: Dry meadows, gravelly soil, in montane conifer woodlands
Elevation: 1400–2300 m

Discussion

Of conservation concern.

Variety argyrocoma is found only on so-called pebble plains in the eastern San Bernardino Mountains, San Bernardino County. The filaments are significantly more flattened than those of other species of Ivesia and approach those that characterize Horkelia.

Selected References

None.

Lower Taxa

None.

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

not carunculate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
2mm +  and 2.5mm +
less as-long-as to longer than wide +  and more +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Barbara Ertter +  and James L. Reveal +
(Rydberg) Rydberg in N. L. Britton et al. +
compound +  and simple +
opposite +  and alternate +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
4 cm40 mm <br />0.04 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Horkelia argyrocoma +
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 +
not +  and aggregated +
1400–2300 m +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
mostly linear +  and narrowly ovate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
flattened +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
10 +  and 20 +
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 +
1 +  and several +
Dry meadows, gravelly soil, in montane conifer woodlands +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
appressed +  and ascending +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1/2 +  and 2/3 +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
(5-)10-30-flowered +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
crassinucellate +
opposite +  and alternate +
winter-marcescent +
deciduous +  and persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
, +  and distinct +
not +  and distinguishable +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
elliptic +  and obovate or oval +
verticillate +
toothed +, unlobed +  and lobed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0 (?) +  and 4 (?) +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
free +  and distinct +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
in N. L. Britton et al., N. Amer. Fl. +
not arillate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
purple-suffused +
persistent +
free +  and distinct +
erect +  and spreading +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Conservation concern +
free +  and distinct +
branched +  and simple +
reddish +, grayish +  and green +
prostrate +  and ascending +
2 +  and 20 +
palmate +  and pinnate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
deciduous +
distinct +
subterminal +
filiform +
rough-thickened +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
Potentilla argyrocoma +
Ivesia argyrocoma var. argyrocoma +
Ivesia argyrocoma +
variety +
glabrate +  and hairy +
inconspicuous +
stipelike +, elongate +, less flat +  and conic or turbinate +
enlarged +
tufted +  and rosetted +
glabrate +  and sparsely densely glandular-puberulent +