Ranunculus occidentalis var. howellii

Greene

Pittonia 3: 14. 1896.

Endemic
Treatment appears in FNA Volume 3.

Stems erect to reclining, 1-3 mm thick, hirsute or sometimes glabrous. Basal leaf-blades 3-parted, ultimate segments narrowly elliptic, margins entire or dentate. Flowers: sepals 5, 4-6 mm; petals 5-6, 6-10 × 3-5 mm. Achenes 3.4-4.8 × 2.6-3.2 mm, glabrous; beak lanceolate, straight, 1.6-2.2 mm.


Phenology: Flowering spring–summer (Apr–Jul).
Habitat: Meadows
Elevation: 900-1400 m

Discussion

Ranunculus occidentalis var. howellii, R. occidentalis var. dissectus, and R. austro-oreganus form a distinctive group distinguishable in the R. occidentalis complex by the straight achene beak. They may be difficult to separate, however; further study of their relationships is needed.

Selected References

None.

Lower Taxa

None.

"high" is not a number.

0.36 cm3.6 mm <br />0.0036 m <br /> (0.48 cm4.8 mm <br />0.0048 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 +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
2.6mm;3.2mm +
acute +  and rounded-obtuse +
Alan T. Whittemore +
Greene +
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 +
straight +
persistent +
lanceolate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.22 cm2.2 mm <br />0.0022 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 />) +
Calif. +  and Oreg. +
900-1400 m +
showy +  and inconspicuous +
sessile +  and aggregate +
cylindric;obovoid;cylindric;obovoid;globose;lenticular;discoid +
Meadows +
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 +  and entire +
0.1mm;0.2mm +
distinct +
6mm;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 /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering spring–summer (Apr–Jul). +
4 +  and 250 +
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 +
oblong +  and elliptic ovate or lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
(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 sect. Chrysanthe +
Ranunculus occidentalis var. howellii +
Ranunculus occidentalis +
variety +
perennial +  and annual +
glabrous +  and hispid +
herbaceous +  and woody +