Drymocallis rhomboidea

(Rydberg) Rydberg

Monogr. N. Amer. Potentilleae, 203. 1898.

Common names: Siskiyou or globose drymocallis or wood beauty
EndemicIllustrated
Basionym: Potentilla rhomboidea Rydberg Bull. Torrey Bot. Club 23: 248. 1896
Synonyms: Drymocallis glandulosa subsp. globosa (D. D. Keck) Soják P. glandulosa subsp. globosa D. D. Keck
Treatment appears in FNA Volume 9. Treatment on page 294. Mentioned on page 282.

Caudex branches short. Stems ± tufted, 1.7–4.7 dm; base 1–3 mm diam., usually not septate-glandular. Leaves moderately to densely hairy; basal 5–12 cm, leaflet pairs 3; terminal leaflet obovate-elliptic, 1–2.5 (–3) × 1–2 (–2.5) cm, teeth single or double, 6–10 per side, apex obtuse to rounded; cauline 0–2, developed or reduced, leaflet pairs 2–3. Inflorescences 5–35-flowered, ± leafy, usually ± open, 1/3–2/3 of stem, wide, branch angles 15–60°. Pedicels 1–5 (proximal to 15) mm, predominantly short-hairy, usually not or sparsely, sometimes moderately, septate-glandular. Flowers opening narrowly; epicalyx bractlets linear-oblanceolate, 2–3.5 × 1 mm; sepals ± erect, 4–6 (–8) mm, apex obtuse; petals not overlapping, ± erect, cream-white, usually narrowly obovate, sometimes oblanceolate, 3–5 × 2–3 mm, usually ± shorter than sepals; filaments 1.5–3 mm, anthers 0.6–1 mm; styles slender, 1.5–2.5 mm. Achenes light reddish-brown, 1–1.2 mm. 2n = 14.


Phenology: Flowering Jun–Jul(–Aug).
Habitat: Dry slopes and outcrops in open forests
Elevation: 1200–2500 m

Discussion

Drymocallis rhomboidea is centered in the Siskiyou Mountains. It differs from D. campanulata in its smaller, cream-white petals and globular flowers; in addition, the vestiture is usually predominantly short-hairy, except in scattered California populations. Plants from Mount Ashland, the type locality, tend to have more congested, leafier inflorescences than plants found elsewhere in the range.

Selected References

None.

Lower Taxa

None.

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

... more about "Drymocallis rhomboidea"
light reddish-brown +
1mm +  and 1.2mm +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Barbara Ertter +
(Rydberg) Rydberg +
compound +  and simple +
opposite +  and alternate +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Potentilla rhomboidea +
oblanceolate-oblong +
1 cm10 mm <br />0.01 m <br /> (25 cm250 mm <br />0.25 m <br />) +
reduced +
free +  and distinct +
Siskiyou or globose drymocallis or wood beauty +
Calif. +  and Oreg. +
not +  and aggregated +
1200–2500 m +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
linear-oblanceolate +
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 />) +
0.3 cm3 mm <br />0.003 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
deciduous +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Dry slopes and outcrops in open forests +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
open +, leafy +  and 5-35-flowered +
1/3 +  and 2/3 +
crassinucellate +
opposite +  and alternate +
marcescent +
winter-persistent +
overlapping +  and not confluent +
elliptic-ovate +  and flabellate or rhombic +
toothed +, or +, flat +, entire +  and more or less toothed +
inferior +  and superior +
clustered +, biseriate +  and superposed +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not overlapping +
0 (?) +  and 4 (?) +
free +  and distinct +
usually more or less shorter +
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 /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Jun–Jul(–Aug). +
adnate +, free +, connate +  and distinct +
Monogr. N. Amer. Potentilleae, +
not arillate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
persistent +
free +  and distinct +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Endemic +  and Illustrated +
free +  and distinct +
branched +  and simple +
stramineous +, reddish +  and green +
1 +  and 20 +
palmate +  and pinnate +
deciduous +
distinct +
fusiform +
slender +
rough-thickened +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Drymocallis glandulosa subsp. globosa +  and P. glandulosa subsp. globosa +
Drymocallis rhomboidea +
Drymocallis +
species +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
obovate-elliptic +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
horseshoe--shaped +
6 +  and 10 +
inconspicuous +
hemispheric +  and conic +
enlarged +
peglike-glandular +  and septate-glandular +