Ranunculus fascicularis
Ranunculus
early buttercup, early crowfoot, prairie buttercup, tuft buttercup
buttercup, crowfoot, renoncule, water-buttercup
always both filiform and tuberous on same stem.
erect or ascending, never rooting nodally, strigose or spreading-strigose, base not bulbous.
blade reniform to linear, margins entire, crenate, or toothed.
blades ovate to broadly ovate in outline, 3-5-foliolate, 2.1-4.7 × 1.9-4.5 cm, leaflets undivided or 1x-lobed or -parted, ultimate segments oblanceolate or obovate, margins entire or with few teeth, apex rounded-acute to rounded-obtuse.
terminal or axillary, 2-50-flowered cymes to 25 cm or solitary flowers;
bracts present or absent, small or large and leaflike, not forming involucre.
receptacle hispid or glabrous;
sepals spreading or sometimes reflexed from base, 5-7 × 2-3 mm, hispid or glabrous;
petals 5(-7), yellow, 8-14 × 3-6 mm.
bisexual, radially symmetric;
sepals sometimes persistent in fruit, 3-5(-6), green or sometimes purple, yellow, or white, plane (base saccate in R. ficaria), oblong to elliptic, ovate, or lanceolate, 1-15 mm;
petals 0-22(-150), distinct, yellow, rarely white, red, or green, plane, linear to orbiculate, 1-26 mm;
nectary present, usually covered by scale;
stamens (5-)10-many;
filaments filiform;
staminodes absent between stamens and pistils;
pistils 4-250, simple;
ovule 1 per ovary;
style present or absent.
achenes, rarely utricles, aggregate, sessile, discoid, lenticular, globose, obovoid, or cylindric, sides sometimes veined;
beak present or absent, terminal, straight or curved, 0-4.5 mm.
globose or ovoid, 5-9 × 5-8 mm;
achenes 2-2.8 × 1.8-2.2 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide;
beak persistent, filiform, straight, 1.2-2.8 mm.
= 7, 8.
= 32.
Ranunculus fascicularis
Ranunculus
Ranunculus fascicularis is very similar to R. hispidus var. hispidus, and herbarium specimens without underground parts may be difficult to identify. Ranunculus fascicularis grows in drier habitats; segments of its leaves are commonly oblanceolate and blunt, with few or no marginal teeth; and its petals are widest at or below the middle. Ranunculus hispidus var. hispidus is usually larger in all its parts (leaves, flowers, heads of achenes); leaf segments are variable in shape but their apices are normally sharper and their marginal teeth more numerous, and petals are widest above the middle.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species about 300 (76 in the flora).
Most Ranunculus species are poisonous to stock; when abundant, they may be troublesome to ranchers. A few species with acrid juice were formerly used as vesicatories. The genus is badly in need of biosystematic work. Apomixis and interspecific hybridization occur in several Old World groups of buttercups; some of the taxonomic complexity of the New World species probably results from these processes.
Considerable disagreement exists among authors on the proper generic and infrageneric classification of Ranunculus. Most of the subgenera accepted here have been treated as separate genera at one time or another. All recent studies have been based on local or continental floras, however, and classifications proposed for one region may not work for the plants of other regions. Like most North American workers, I have followed the generic and infrageneric classification of L. D. Benson (1948), who gave by far the most thorough and best documented study of the problem. The genus and its subdivisions should be studied on a worldwide basis.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. All leaves simple and unlobed. | → 2 |
1. Some or all leaves simple and lobed, or compound. | → 9 |
2. Cauline leaves absent or scalelike; sepals deciduous or persistent. | → 3 |
2. Cauline leaves present, well developed; sepals deciduous. | → 5 |
3. Petals 5; achene beak 0.1-0.2 mm; plants stoloniferous, without caudices. | Halodes (Ranunculus cymbalaria) |
3. Petals 8-18; achene beak 0.8-1.4 mm; plants not stoloniferous, stems erect from short caudices. | → 4 |
4. Leaf blades undivided, margins entire or serrulate; sepals persistent in fruit; petals 7-12 mm. | Oxygraphis (Ranunculus kamtschaticus) |
4. Leaf blades shallowly lobed, margins crenate; sepals deciduous; petals 2-4 mm | Pseudaphanostemma (Ranunculus hystriculus) |
5. Tuberous roots present; flowers yellow; sepals 3. | Ficaria (Ranunculus ficaria) |
5. Tuberous roots absent (roots thickened proximally in some 5-sepaled species of sect. Flammula); flowers yellow, white, or pink. | → 6 |
6. Achenes 4.2-5.2 mm, achene body prolonged beyond seed as corky distal appendage; sepals 3, 6-10 mm; petals white to pink. | Pallasiantha (Ranunculus pallasii) |
6. Achenes 0.8-2.8 mm, achene body not prolonged beyond seed; sepals (3-)4-5, 1.5-12 mm; petals yellow. | → 7 |
7. Sepals covered with dense brown pubescence; distal leaves and bracts apically 3-crenate or shallowly 3-lobed, otherwise undivided. | Epirotes (Ranunculus macauleyi) |
7. Sepals glabrous or with colorless hairs; distal leaves simple and undivided. | → 8 |
8. Achene wall papery, longitudinally ribbed; leaf apex broadly rounded to truncate, margins crenate. | Halodes (Ranunculus cymbalaria) |
8. Achene wall thick, not ornamented, smooth (sometimes pubescent); leaf apex acuminate to rounded-obtuse, margins entire or finely toothed. | sect. Flammula |
9. Leafy stems creeping and rooting at nodes or floating in water, then rootless. | → 10 |
9. Leafy stems erect or if decumbent rooting only at base, never floating. | → 14 |
10. Leaves 3-foliolate. | sect. Ranunculus |
10. Leaves simple, lobed to filiform-dissected or occasionally undivided. | → 11 |
11. Achene body prolonged beyond seed as corky distal appendage; sepals 3, petals 5-11. | → 12 |
11. Achene body not prolonged beyond seed; either sepals 5 or sepals 3-4 and petals also 3-4. | → 13 |
12. Leaf blade as wide as long, ternately divided to base. | Coptidium (Ranunculus lapponicus) |
12. Leaf blade much longer than wide, unlobed or lobed. | Pallasiantha (Ranunculus pallasii) |
13. Petals white or white with yellow claws; achenes with strong coarse wrinkles. | subg. Batrachium |
13. Petals yellow; achenes smooth (faintly wrinkled in R. sceleratus var. sceleratus). | sect. Hecatonia |
14. Petals pure red, or white when immature; fruits winged achenes or utricles. | subg. Crymodes |
14. Petals yellow, rarely also with some red pigmentation abaxially, or greenish yellow; fruits achenes, rarely winged. | → 15 |
15. Cauline leaves absent or scalelike, tuberous roots absent; leaves sometimes deeply parted or dissected, never compound. | → 16 |
15. Cauline leaves present, simple, lobed or dissected, or compound (rarely reduced to scales in R. fascicularis with tuberous roots and 3-5-foliolate leaves). | → 18 |
16. Plants villous; sepals 3-6 × 1-2 mm, persistent in fruit; fruit wall firm, smooth, beak much longer than achene body. | Ceratocephala (Ranunculus testiculatus) |
16. Plants glabrous; sepals 6-13 × 3-7 mm, deciduous in fruit; fruit wall thin, veined, beak much shorter than achene body. | → 17 |
17. Leaves shallowly 5-7-lobed; petals inconspicuous, 2-4 mm. | Pseudaphanostemma (Ranunculus hystriculus) |
17. Leaves 3-5-parted; petals showy, 8-12 mm. | Arcteranthis (Ranunculus cooleyae) |
18. Style absent, stigma sessile; achene margins thick and corky; emergent aquatic, sometimes also found on very wet soil. | Hecatonia (Ranunculus sceleratus) |
18. Style present; achene margins not corky; in various habitats but rarely aquatic. | → 19 |
19. Achene wall thin, longitudinally striate; scale of nectary reduced to low ridge, not covering nectary. | Cyrtorhyncha (Ranunculus ranunculinus) |
19. Achene wall thick, smooth, papillose, or spiny; scale of nectary well-developed flap or pocket completely covering nectary. | → 20 |
20. Achenes thick-lenticular or asymmetrically thick-lenticular to compressed-globose, 1.2-2 times as wide as thick; nectary scale joined with petal on 3 sides, forming pocket enclosing nectary (sometimes with apex free, forming flap shorter than pocket); basal leaves various, unlobed to deeply divided, margins entire to crenate but never at all serrate. | sect. Epirotes |
20. Achenes strongly flattened, at least 3-15 times as wide as thick; nectary scale free from petal for at least 1/2 its length, thus forming free scale over nectary (scale sometimes free for less than 1/2 its length in R. recurvatus, with serrate to crenate-serrate leaf margins); basal leaves always deeply lobed or compound (except sometimes in R. marginatus and R. orthorhynchus), margins various. | → 21 |
21. Achenes papillose or spiny (sometimes smooth in R. sardous); flowers small, petals 1-6 mm, scarcely longer than sepals, sometimes absent (larger and much longer than sepals in R. sardous). | sect. Echinella |
21. Achenes smooth, glabrous or pubescent; flowers small to large, petals always present, 2-22 mm. | sect. Ranunculus |
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