Ranunculus inamoenus var. inamoenus Greene
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Family: Ranunculaceae
Genus: Ranunculus
Species Synonyms: Ranunculus affinis var. micropetalus Greene
Ranunculus inamoenus var. typicus L. Benson
Common Names: graceful buttercup
Canada: Yukon – Mackenzie District – Keewatin District – Arctic Island, south to British Columbia – southwestern Alberta – northwestern Saskatchewan – northern Manitoba – northern Ontario – Ungava – eastern Quebec – Labrador – northern Newfoundland
Saskatchewan: northeastern Saskatchewan; Lake Athabasca
Ecoregion: Athabasca Plain
Saskatchewan: moist grassy ravine slopes, lakeshores, and open woods
Associated Species: Labrador buttercup, largefruit biscuitroot, little larkspur
Provincial Status According
to Harms (2003):
Nature Conservancy Status:
G5 S1
Saskatchewan Species at
Risk Status:
Graceful buttercup is endangered because of rarity in Saskatchewan. It is regionally restricted to the southwestern part of the province. Possible threats have been identified for this species.
Height: 5 – 30 cm
Roots: slender
Stems: perennial, erect, long-hairy or hairless
Leaves: basal leaves persistent, 1 – 4 cm long, 1 – 3.5 cm wide, oval to round, generally undivided or 3 – 5-lobed, base acute to rounded, tip rounded, margins entire or round-toothed; stem leaves differing from basal leaves, divided, segments 3, narrow
Inflorescence: flowers 3 – 7 per stem; receptacle elongating in fruit to form a head of fruits, heads cylindrical
Flowers: stalks slender, appressed-hairy; receptacle long-hairy or hairless; sepals 3 – 5 mm long, 2 – 3 mm wide, spreading or reflexed, hairy below; petals 5, 4 – 9 mm long, about twice as long as sepals, 2 – 5 mm wide, yellow; nectary scale hairless; stamens numerous; carpels numerous on a receptacle
Fruits: fruits grey-hairy or hairless; beaks 0.5 – 1 mm long, straight or hooked
1 Petals white; aquatic plants with all leaves submersed
R. aquatilis var. diffusa
1 Petals yellow; mostly terrestrial plants or not strictly aquatic (except R. gmelinii)
2 Fruits with 3 or 4 longitudinal nerves; leaves round-toothed; plants with runners
R. cymbalaria
2 Fruits not nerved longitudinally; leaves various; plants without runners
3 Basal leaves entire to slightly lobed, upper leaves similar or absent
3 Basal leaves distinctly toothed, lobed or divided OR if entire, stem leaves deeply lobed or cleft and unlike the basal leaves OR basal leaves absent
4 Leaves linear and essentially bladeless or blades linear
R. flammula var. reptans
4 Leaves with well-developed lance-shaped to oval blades
R. flammula var. ovalis
5 Sepals 3 or 4; leaves kidney-shaped
5 Sepals 5; leaves of various shapes
6 Plants at least partially aquatic, < 5 cm high; leaves to 1 cm wide; fruits not constricted, nearly beakless
R. hyperboreus var. hyperboreus
6 Plants terrestrial, 10 – 20 cm high; leaves to 5 cm wide; fruits constricted near the middle, beak hooked
R. lapponicus
7 Plants strictly aquatic, weak stems floating
R. gmelinii
7 Plants not strictly aquatic
8 Beaks of fruits minute, fruit corky-thickened towards base; plant fleshy; lower leaves stalked
R. sceleratus
8 Beaks of fruits distinct, fruit not corky-thickened towards base; plants not fleshy; lower leaves more or less all sessile
9 Basal leaves entire to round-toothed or shallowly 3 – 5-lobed, stem leaves cleft or divided
9 Basal leaves deeply dissected, the lobes often toothed
10 Hairs on sepals reddish-brown, long; stems usually 1-flowered
R. nivalis
10 Sepals hairless or white-hairy; stems usually 2 – many-flowered
11 Fruiting heads cylindrical
11 Fruiting heads nearly round
12 Fruits to 150 per aggregate, finely hairy; plants hairy; petals 5 – 9 mm long
R. glaberrimus var. ellipticus
12 Fruits to 50 per aggregate, hairless; plants hairless; petals 6 – 15 mm long
R. rhomboideus
13 Petals 1.5 – 3 mm long; basal leaves kidney-shaped
R. abortivus
13 Petals greater than 3 mm long; basal leaves circular or heart-shaped
14 Flower stalks stout; petals 8 – 15 mm long; stems and leaves long-hairy
R. cardiophyllus
14 Flower stalks slender; petals 3 – 8 mm long; stems and leaves nearly hairless
R. inamoenus var. inamoenus
15 Fruits slightly flattened, beaks slender; receptacle in fruit 4 times its length in flower
R. pedatifidus var. affinis
15 Fruits very strongly flattened, beaks stout; receptacle in fruit < 3 times its length in flower
16 Petals 5 – 15 mm long, noticeably longer than sepals; sepals spreading; terminal segment of larger leaves sessile
R. acris var. acris
16 Petals 4 – 5 mm long, shorter than or barely surpassing sepals; sepals reflexed; terminal segment of larger leaves stalked
17 Stems reclining or prostrate, often rooting at lower nodes; petals equalling or longer than sepals, deep yellow; sepals purplish; heads of fruits ovoid to round
R. macounii
17 Stems erect, not rooting at the nodes; petals shorter than sepals, pale yellow; sepals yellowish; heads of fruits cylindrical
R. pensylvanicus