Ranunculus subg. Oxygraphis

(Bunge) L. D. Benson

Amer. J. Bot. 27: 806. 1940.

Basionym: Undefined subg. Oxygraphis Bunge Verz. Altai Pfl., 46. 1836
Treatment appears in FNA Volume 3.
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Plants glabrous. Stems erect from short caudices or rhizomes, stolons absent, not bulbous-based, without bulbils. Roots from rhizome only, never tuberous. Leaves all basal, simple, petiolate; blades undivided, unlobed, margins entire or serrulate. Inflorescences terminal, solitary flowers. Flowers: sepals persistent in fruit, 5; petals 9-18, yellow, 7-12 mm; nectary scale attached basally, forming low ridge not covering nectary, glabrous, free margin entire; style present. Fruits achenes, 1-locular; achene body ellipsoid, about as wide as thick, not prolonged beyond seed; wall membranous, loose and ± inflated, with 1-2 longitudinal veins on each face; margin narrow ridge; beak 0.8-1.4 mm, shorter than achene body.

Distribution

North America, Asia

Discussion

Species 5 (1 in the flora).

Selected References

None.

Alan T. Whittemore +
(Bunge) L. D. Benson +
cuneate +, truncate +  and cordate +
Undefined subg. Oxygraphis +
curved +  and straight +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
unlobed +
large +  and small +
globose;cylindric +
2-50-flowered +
0 cm0 mm <br />0 m <br /> (25 cm250 mm <br />0.25 m <br />) +
North America +  and Asia +
sessile +  and pedicellate +
showy +  and inconspicuous +
sessile +  and aggregate +
cylindric;obovoid;cylindric;obovoid;globose;lenticular;discoid +
axillary +  and terminal +
reniform +  and linear +
petiolate +  and simple +
whorled +, opposite +  and alternate +
cauline +  and basal +
parted +  and lobed +
palmate +  and pinnate +
entire +  and serrulate +
toothed;crenate;toothed;crenate;entire +
distinct +
conspicuous +
linear +  and orbiculate +
reduced +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
4 +  and 250 +
Amer. J. Bot. +
not arillate +  and stalked +
white;yellow;white;yellow;purple;sometimes;green +
persistent +
distinct +
3 +  and 6 +
oblong +  and elliptic ovate or lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
(5-)10-many +
not bulbous-based +
persistent +
Ranunculus subg. Oxygraphis +
Ranunculus +
subgenus +
1 (?) +  and 2 (?) +
inflated +
membranous +
perennial +  and annual +
herbaceous +  and woody +