Ivesia arizonica

(Eastwood ex J. T. Howell) Ertter

Syst. Bot. 14: 233. 1989.

Common names: Purpusia
Conservation concernEndemicIllustrated
Basionym: Purpusia arizonica Eastwood ex J. T. Howell Madroño 2: 12. 1930
Treatment appears in FNA Volume 9. Treatment on page 224. Mentioned on page 219, 221, 222.

Plants green, ± tufted, often forming hanging clumps, sometimes rosetted. Stems pendent or prostrate to ascending, (0.2–) 0.5–1.6 (–3) dm. Basal leaves planar, 2–15 (–20) cm; sheathing base usually not strigose abaxially; petiole 3–10 cm; lateral leaflets (2–) 3–4 (–5) per side, separate, broadly ovate or obovate to orbiculate, (2–) 5–15 (–18) mm, incised 1/4–3/4 to base into (3–) 7–11 ± ovate teeth, apex not setose, surfaces ± sparsely short-pilose, ± glandular; terminal leaflets ± distinct. Cauline leaves 1–3; blade well developed. Inflorescences (1–) 5–30 (–150) -flowered, open, 0.5–14 cm diam. Pedicels 5–30 mm. Flowers 6–12 mm diam.; epicalyx bractlets 0 (–3), lanceolate, 0.9–1.8 mm; hypanthium turbinate or campanulate, 1.5–3 (–5) × 1–3 (–4) mm; sepals 2–4 (–5) mm, acute; petals yellow or white, oblanceolate to elliptic or obovate, (1.6–) 2–4 mm; stamens 5, filaments 0.8–1.3 mm, anthers ± yellow, oblong to narrowly ovate, 0.6–1.5 mm; carpels (2–) 6–10 (–13), atop a stipelike torus, styles 0.9–1.8 mm. Achenes greenish white to light tan, 1.2–2 mm, faintly rugose, ± carunculate.

Discussion

Varieties 2 (2 in the flora).

Because the epithet saxosa was retained for Potentilla saxosa upon transfer to Ivesia, a different epithet (arizonica) was needed when Purpusia was likewise transferred in the same publication (B. Ertter 1989). The correct name for this species in Potentilla is P. osterhoutii (A. Nelson) J. T. Howell, due to the existence of P. arizonica.

Selected References

None.

Key

1 Petals yellow; hypanthia campanulate. Ivesia arizonica var. arizonica
1 Petals white; hypanthia turbinate. Ivesia arizonica var. saxosa

"dm" is not declared as a valid unit of measurement for this property.

... more about "Ivesia arizonica"
greenish white +  and light tan +
1.2mm +  and 2mm +
shorter than wide +  and longer +
oblong +  and narrowly ovate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
not setose +
Barbara Ertter +  and James L. Reveal +
(Eastwood ex J. T. Howell) Ertter +
compound +  and simple +
opposite +  and alternate +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
2 cm20 mm <br />0.02 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Purpusia arizonica +
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 +
Purpusia +
Ariz. +, Calif. +, Nev. +  and Utah +
not +  and aggregated +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
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 +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 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 /> (0.4 cm4 mm <br />0.004 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
open +  and (1-)5-30(-150)-flowered +
0.5 cm5 mm <br />0.005 m <br /> (14 cm140 mm <br />0.14 m <br />) +
crassinucellate +
1.5 cm15 mm <br />0.015 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
opposite +  and alternate +
winter-marcescent +
deciduous +  and persistent +
separate +  and overlapping +
, +  and distinct +
distinguishable +
lobed +  and toothed +
oblanceolate +  and oval or obovate +
verticillate +
toothed +, unlobed +  and lobed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.5 cm5 mm <br />0.005 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0 (?) +  and 4 (?) +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
free +  and distinct +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
adnate +, free +, connate +  and distinct +
not arillate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
persistent +
free +  and distinct +
erect +  and spreading +
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 +
prostrate +  and ascending +
2 +  and 20 +
palmate +  and pinnate +
deciduous +
distinct +
subterminal +
filiform +
rough-thickened +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
short-pilose +
Saxosae +, Ivesia sect. Saxosae +, Potentilla sect. Saxosae +, Potentilla subg. Purpusia +  and Undefined sect. Purpusia +
not fusiform +
Ivesia arizonica +
Ivesia sect. Setosae +
species +
7 +  and 11 +
inconspicuous +
stipelike +
enlarged +
glabrate +  and sparsely densely glandular-puberulent +