Horkelia truncata

Rydberg in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 22: 274. 1908.

Common names: Ramona horkelia
Conservation concern
Synonyms: Potentilla truncata (Rydberg) Jepson
Treatment appears in FNA Volume 9. Treatment on page 256. Mentioned on page 250.

Plants tufted, green. Stems erect, 2–6 (–8) dm, hairs spreading. Basal leaves planar, 4–13 × 2–3.5 (–4) cm; stipules entire or basally lobed; leaflets 1–3 per side, separate, oblong to obovate, 10–30 × 5–12 (–15) mm, ± 1/2 as wide as long, divided 1/6–1/4 to midrib into (15–) 20–30 acute to obtuse teeth, sparsely short-pilose to glabrate, especially adaxially. Cauline leaves 4–7. Inflorescences open, flowers arranged individually. Pedicels 4–20 (–30) mm. Flowers 12–17 mm diam.; epicalyx bractlets broadly ovate, 3–4.5 × 2–3 mm, ± 2/3 length of sepals, entire; hypanthium 1.5–2 × 5–8 mm, less than 1/2 as deep as wide, interior glabrous; sepals ± reflexed, broadly ovate, 3.5–5.5 mm; petals obovate to round, 5–7 × (3–) 4–7 mm, apex ± rounded; filaments 1–2 × 0.5–2 mm, anthers 0.8–1 mm; carpels 50–80; styles 1.5–3 mm. Achenes brown, 1.3–1.5 mm, smooth.


Phenology: Flowering summer.
Habitat: Dry clay soil, in chaparral communities, oak woodlands
Elevation: 400–1300 m

Distribution

V9 402-distribution-map.jpg

Calif., Mexico (Baja California)

Discussion

Of conservation concern.

Horkelia truncata is confined to the Peninsular Ranges of San Diego County, California, and northern Baja California, Mexico. Plants of the species are unusual in Horkelia in that the terminal leaflet is usually notably larger than the lateral leaflets, unlobed, and distinct, rather than confluent with the distal lateral ones.

Selected References

None.

Lower Taxa

None.

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

... more about "Horkelia truncata"
rugose +  and smooth +
1.3mm +  and 1.5mm +
longer than wide +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
truncate +  and emarginate +
Barbara Ertter +  and James L. Reveal +
Rydberg in N. L. Britton et al. +
compound +  and simple +
opposite +  and alternate +
3.5 cm35 mm <br />0.035 m <br /> (4 cm40 mm <br />0.04 m <br />) +
4 cm40 mm <br />0.04 m <br /> (13 cm130 mm <br />0.13 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
flattened +
30 cm300 mm <br />0.3 m <br /> (40 cm400 mm <br />0.4 m <br />) +
planar +  and cylindric +
2 cm20 mm <br />0.02 m <br /> (30 cm300 mm <br />0.3 m <br />) +
reduced +
free +  and distinct +
Ramona horkelia +
open to congested +
Calif. +  and Mexico (Baja California) +
not +  and aggregated +
400–1300 m +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
flattened +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
obliquely ovoid +  and reniform +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Dry clay soil, in chaparral communities, oak woodlands +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
glabrous +  and pilose +
0 +  and 1/2 +
0.1 cm1 mm <br />0.001 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
crassinucellate +
opposite +  and alternate +
marcescent +
winter-persistent +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sparsely short-pilose +  and glabrate +
divided +, oblong +  and obovate +
0.5 cm5 mm <br />0.005 m <br /> (?) +  and 1.2 cm12 mm <br />0.012 m <br /> (?) +
oblanceolate +
palmate +  and pinnate +
shallowly toothed +  and deeply divided +
inferior +  and superior +
clustered +, biseriate +  and superposed +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
recurved +  and reflexed +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0 (?) +  and 4 (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
free +  and distinct +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Flowering summer. +
adnate +, free +, connate +  and distinct +
in N. L. Britton et al., N. Amer. Fl. +
not arillate +
persistent +
free +  and distinct +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
Conservation concern +
free +  and distinct +
branched +  and simple +
stramineous +, reddish +  and green +
1 +  and 10 +
palmate +  and pinnate +
deciduous +
distinct +
subterminal +
filiform +
rough-thickened +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Potentilla truncata +
Horkelia truncata +
Horkelia sect. Horkelia +
species +
20 +  and 30 +
acute +  and obtuse +
inconspicuous +
enlarged +
hairy +  and inconspicuously conspicuously glandular +