Potentilla rhyolitica

Ertter

J. Bot. Res. Inst. Texas 1: 50, fig. 1. 2007.

Conservation concernEndemic
Treatment appears in FNA Volume 9. Treatment on page 186. Mentioned on page 183, 184, 185.

Short hairs not well differentiated from long hairs, absent or sparse throughout. Stems 0.2–2 dm. Basal leaves ternate, rarely palmate, 2–8 (–11) cm; petiole 1–6 (–8) cm, long hairs abundant to dense, spreading to loosely appressed, 1–2 (–3) mm, weak to ± stiff, glands ± abundant; leaflets 3 (–5), central obovate to broadly elliptic, 1–3 × 0.8–1.8 cm, often distinctly petiolulate, distal 1/2–2/3 of margins evenly incised ± 1/3 to midvein, teeth 2–3 (–4) per side, surfaces green to gray-green, long hairs common to dense, 1 mm, glands abundant. Inflorescences 1–10-flowered. Pedicels 0.5–1 (–2) cm. Flowers: epicalyx bractlets lanceolate-elliptic, 2–4 × 1 mm; hypanthium 3–5 mm diam.; sepals 3–5 mm, apex acute; petals ± paler abaxially, bright-yellow adaxially, ± obcordate, 3–7 × 2–5 mm; filaments 1.5–3 mm, anthers 0.6–1 mm; carpels 5–15, styles 2–3 mm. Achenes 1.5–2 mm, smooth to lightly rugose.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Leaves gray-green, hairs usually dense, sometimes common; styles 2–2.5 mm; achenes 1.5 mm, smooth to lightly rugose; Santa Rita and Huachuca ranges. Potentilla rhyolitica var. rhyolitica
1 Leaves green, hairs common, rarely dense; styles (2–)2.5–3 mm; achenes 2 mm, smooth; Chiricahua Range. Potentilla rhyolitica var. chiricahuensis

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

... more about "Potentilla rhyolitica"
smooth +  and lightly rugose +
1.5mm +  and 2mm +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Barbara Ertter +
Ertter +
palmate +  and ternate +
opposite +  and alternate +
8 cm80 mm <br />0.08 m <br /> (11 cm110 mm <br />0.11 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Subviscosae +
25 cm250 mm <br />0.25 m <br /> (30 cm300 mm <br />0.3 m <br />) +
less cordate or reniform +  and narrowly elliptic +
0.5 cm5 mm <br />0.005 m <br /> (25 cm250 mm <br />0.25 m <br />) +
reduced +
free +  and distinct +
hairy +  and glabrous +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1/3 +, 1/2 +  and 2/3 +
obovate +  and broadly elliptic +
0.8 cm8 mm <br />0.008 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
not +  and aggregated +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 cm10 mm <br />0.01 m <br /> (?) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
5-merous +, racemiform +, open +, cymose +  and 2-10(-20)-flowered +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
on style scar +, hairy +  and glabrous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
stoloniferous +  and short-rhizomatous +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
straight +
weak +  and more or less stiff +
spreading +  and loosely appressed +
common +, abundant +  and sparse +
crisped +
1 cm10 mm <br />0.01 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
differentiated +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
crassinucellate +
bipinnate +, odd-pinnate +, subpalmate +, palmate +  and ternate +
opposite +  and alternate +
marcescent +
well-developed +
persistent +
cauline +  and basal +
reduced +
separate +  and slightly overlapping +
orbiculate +, elliptic +  and broadly obovate or cuneate +
linear +  and oblanceolate +
palmate +  and pinnate +
1/5 +  and 3/4 +
inferior +  and superior +
clustered +, biseriate +  and superposed +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
free +  and distinct +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
adnate +, free +, connate +  and distinct +
palmate +  and ternate +
10 cm100 mm <br />0.1 m <br /> (18 cm180 mm <br />0.18 m <br />) +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
usually not much longer +
J. Bot. Res. Inst. Texas +
not arillate +
persistent +
free +  and distinct +
erect +  and spreading +
lanceolate +  and broadly ovate or deltate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Conservation concern +  and Endemic +
free +  and distinct +
not rooting +
reddish +  and green +
1-3(-5) times basal leaves +
prostrate to decumbent +
1 +  and many +
not flagelliform +
palmate +  and pinnate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
deciduous +
distinct +
subapical +
papillate-swollen +, tapered-columnar +  and filiform +
rough-thickened +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
green +  and gray-green +
not glaucous +
Potentilla rhyolitica +
Potentilla sect. Subviscosae +
species +
2 +  and 3 +
inconspicuous +
enlarged +
tufted +  and rosetted +
biennial +, annual +  and perennial +
herb +  and matted +