Ranunculus rhomboideus

Goldie

Edinburgh J. Sci. 6: 329. 1822.

Endemic
Treatment appears in FNA Volume 3.

Stems erect, 5-22 cm, pilose or occasionally glabrous, each with 3-12 flowers. Roots slender, 0.8-1.8 mm thick. Basal leaves persistent, blades ovate to rhombic, undivided or rarely innermost 3-parted, 1.1-5.3 × 0.9-3.6 cm, base obtuse, margins crenate with 5 crenae, apex rounded. Flowers: pedicels pilose; receptacle pilose; sepals 4-6 × 1.5-3 mm, abaxially pilose, hairs colorless; petals 5, 6-8 × 2-4 mm; nectary scale glabrous. Heads of achenes depressed-globose, 4-6 × 5-7 mm; achenes 1.8-2.2 × 1.2-1.8 mm, glabrous; beak slender, curved, 0.2-0.3 mm. 2n = 16.


Phenology: Flowering spring (Apr–Jun).
Habitat: Prairies, or occasionally open woods or thickets
Elevation: 0-900 m

Distribution

V3 860-distribution-map.gif

Alta., B.C., Man., N.W.T., Ont., Sask., Ill., Iowa, Mich., Minn., Mont., Nebr., N.Dak., S.Dak., Wis.

Discussion

In addition to the range given above, L. D. Benson (1948) cited nineteenth-century specimens from Quebec, New York, Massachusetts, and Rhode Island. No modern specimens have been seen from those areas.

Selected References

None.

Lower Taxa

None.
... more about "Ranunculus rhomboideus"
not prolonged +
asymmetrically thick-lenticular +  and compressed-globose +
1.2-2 times as wide as thick +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
1.2mm;1.8mm +
rounded +
Alan T. Whittemore +
Goldie +
Ranunculus sect. Marsypadenium +
slender +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
ovate;rhombic +
large +  and small +
globose;cylindric +
sometimes;sessile;nearly sessile +
1-50-flowered +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Sask. +, Ill. +, Iowa +, Mich. +, Minn. +, Mont. +, Nebr. +, N.Dak. +, S.Dak. +  and Wis. +
0-900 m +
showy +  and inconspicuous +
sessile +  and aggregate +
cylindric;obovoid;cylindric;obovoid;globose;lenticular;discoid +
Prairies, or occasionally open woods or thickets +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
depressed-globose +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
axillary +  and terminal +
reniform +  and linear +
compound +  and simple +
whorled +, opposite +  and alternate +
1.1 cm11 mm <br />0.011 m <br /> (5.3 cm53 mm <br />0.053 m <br />) +
innermost +
3-parted +
0.9 cm9 mm <br />0.009 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
palmate +  and pinnate +
inconspicuous +
distinct +
conspicuous +
linear +  and orbiculate +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering spring (Apr–Jun). +
4 +  and 250 +
Edinburgh J. Sci. +
slender +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
not arillate +  and stalked +
again +  and undivided +
parted +  and lobed +
white;yellow;white;yellow;purple;sometimes;green +
deciduous +
distinct +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
oblong +  and elliptic ovate or lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
(5-)10-many +
not bulbous-based +
glabrous +  and pilose +
5 cm50 mm <br />0.05 m <br /> (22 cm220 mm <br />0.22 m <br />) +
persistent +
Ranunculus rhomboideus +
Ranunculus sect. Epirotes +
species +
perennial +  and annual +
pubescent +, pilose +, sometimes +  and glabrous +
herbaceous +  and woody +