Ranunculus occidentalis var. occidentalis

EndemicIllustrated
Synonyms: Ranunculus occidentalis var. eisenii A. Gray Ranunculus occidentalis var. rattanii
Treatment appears in FNA Volume 3.

Stems erect to reclining, 1-3 (-4) mm thick, hirsute or sometimes glabrous. Basal leaf-blades 3-parted or foliolate, ultimate segments oblong or elliptic to lanceolate or oblanceolate, margins dentate or dentate-lobulate. Flowers: sepals 5, 4-7 mm; petals 5-6, 5-10 × 3-6 mm. Achenes 2.6-3.6 (-4) × 1.8-3 (-3.2) mm, glabrous or hispid; beak lanceolate, curved, (0.6-) 1-1.4 mm.


Phenology: Flowering late winter–spring (Mar–Jun).
Habitat: Grassy slopes of meadows or open woodlands
Elevation: 0-1500 m

Distribution

V3 990-distribution-map.gif

B.C., Calif., Nev., Oreg., Wash.

Discussion

L. D. Benson (1948) divided Ranunculus occidentalis var. occidentalis into three varieties. The name R. occidentalis var. occidentalis was applied only to plants from Oregon northward, in which leaves are rarely compound and never have lanceolate ultimate segments, and achenes are always glabrous and have beaks over 1 mm. California plants were treated as R. occidentalis var. rattanii (plants with small [5-8 mm] petals from the Coast Ranges) and R. occidentalis var. eisenii (plants with larger petals from the foothills surrounding the Central Valley). Most of those plants from California, however, cannot be distinguished from more northern plants, and forms with small petals are found throughout the range of the variety.

Selected References

None.

Lower Taxa

None.

"high" is not a number.

0.36 cm3.6 mm <br />0.0036 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
not prolonged +
3-15 times as wide as thick +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
hispid +  and glabrous +
1.8mm;3mm +
acute +  and rounded-obtuse +
Alan T. Whittemore +
Nuttall in J. Torrey & A. Gray +
1.5 cm15 mm <br />0.015 m <br /> (5.3 cm53 mm <br />0.053 m <br />) +
2.2 cm22 mm <br />0.022 m <br /> (8 cm80 mm <br />0.08 m <br />) +
not bulbous +
cuneate +, truncate +  and cordate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +
lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
large +  and small +
globose;cylindric +
1-50-flowered +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
B.C. +, Calif. +, Nev. +, Oreg. +  and Wash. +
0-1500 m +
showy +  and inconspicuous +
sessile +  and aggregate +
cylindric;obovoid;cylindric;obovoid;globose;lenticular;discoid +
Grassy slopes of meadows or open woodlands +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
hemispheric +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
axillary +  and terminal +
reniform +  and linear +
whorled +, opposite +  and alternate +
cauline +  and basal +
parted +  and lobed +
palmate +  and pinnate +
dentate-lobulate;dentate +
0.1mm;0.2mm +
distinct +
5mm;10mm +
conspicuous +
linear +  and orbiculate +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering late winter–spring (Mar–Jun). +
4 +  and 250 +
in J. Torrey & A. Gray, Fl. N. Amer. +
nodal +  and basal +
not arillate +  and stalked +
1(-2)×-lobed +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
white;yellow;white;yellow;purple;sometimes;green +
deciduous +
distinct +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
oblong +  and elliptic ovate or lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Endemic +  and Illustrated +
(5-)10-many +
erect +  and reclining +
glabrous +  and hirsute +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
persistent +
Ranunculus occidentalis var. eisenii +  and Ranunculus occidentalis var. rattanii +
Ranunculus occidentalis var. occidentalis +
Ranunculus occidentalis +
variety +
perennial +  and annual +
glabrous +  and hispid +
herbaceous +  and woody +