Ranunculus aquatilis |
Ranunculus hebecarpus |
|||||
---|---|---|---|---|---|---|
renoncule aquatique, water buttercup, water crowfoot, white water butter cup, white water crowfoot, white water crowsfoot, white western buttercup |
delicate buttercup, downy buttercup, pubescent fruit buttercup |
|||||
Stems | glabrous. |
erect, pilose. |
||||
Leaves | laminate and filiform-dissected; laminate leaf blades reniform, 3-parted, 0.4-1.1 × 0.7-2.3 cm, segments obovate or fan-shaped, shallowly cleft, margins crenate; filiform-dissected leaves with stipules gradually tapering upward, connate for their whole length. |
|||||
Flowers | receptacle hispid, rarely glabrous; sepals spreading or reflexed, 2-4 × 1-2 mm, glabrous; petals 5, 4-7 × 1-5 mm; style 0.1-0.8 mm. |
pedicellate; receptacle glabrous; sepals 5, spreading, 1.1-1.8 × 0.5-1 mm, pilose; petals 0-5, 1.3-2 × 0.3-0.7 mm. |
||||
Fruiting pedicels | usually recurved. |
|||||
Heads of achenes | hemispheric to ovoid, 2-4 × 2-5 mm; achenes 1-2 × 0.8-1.4 mm, glabrous or hispid; beak persistent, filiform, 0.1-1.2 mm. |
discoid, 4-6 × 3 mm; achenes 4-9 per head, 1.7-2.3 × 1.7-2 mm, faces and margin papillose, each papilla crowned with hooked bristle, otherwise glabrous; beak lanceolate, hooked distally, 0.5-0.7 mm. |
||||
Basal | and lower cauline leaf blades cordate-reniform, deeply 3-parted, 0.6-2.3 × 1.2-3.5 cm, segments undivided or 2-4-lobed, base shallowly cordate, margins entire or 2-4-dentate, apex of ultimate segments acute. |
|||||
Ranunculus aquatilis |
Ranunculus hebecarpus |
|||||
Phenology | Flowering spring (Mar–May). | |||||
Habitat | Grasslands, open woodlands, and chaparral | |||||
Elevation | 50-900 m (200-3000 ft) | |||||
Distribution |
AK; AL; AR; AZ; CA; CO; CT; DE; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Eurasia
|
CA; ID; OR; WA; Mexico (Baja California)
|
||||
Discussion | Varieties 2 (2 in the flora). Ranunculus aquatilis is very variable. In the past it has often been treated as three or four species and many varieties. These segregate taxa have been based on the size, petiolation and rigidity of the leaves (now known to be primarily under environmental control), petal size and curvature of the fruiting pedicel (both sometimes variable along single stem), and number of achenes per head and length of achene beak (which vary continuously and are not correlated with one another). Unless reliable characters can be found, only two of the taxa recognized in older floras can be maintained. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Ranunculus hebecarpus is native to western North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||
Key |
|
|||||
Source | FNA vol. 3. | FNA vol. 3. | ||||
Parent taxa | Ranunculaceae > Ranunculus > subg. Batrachium | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Batrachium aquatile | |||||
Name authority | Linnaeus: Sp. Pl. 1: 556. (1753) | Hooker & Arnott: Bot. Beechey Voy., 316. (1838) | ||||
Web links |
|
|