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Hooked Buttercup

Miss Chen
05-16
Description: This herbaceous perennial plant is about 1-2' tall, consisting of some basal leaves, branched stems with alternate leaves, and flowers. The basal leaves are up to 5" long and 5" across; they have long hairy petioles. Each basal leaf is palmately cleft into 3-5 lobes; these lobes are often divided again into smaller lobes. The alternate leaves are similar to the basal leaves, except they become smaller as they ascend the stems and their petioles are shorter. The upper leaves are more slender and divided into fewer lobes. The margins of the leaves are crenate or dentate. The upper surface of each leaf is medium to dark green and glabrous. The stems are light green, terete, and covered with long hairs; they are erect to ascending, rather than sprawling across the ground.

The upper stems terminate in loose clusters of flowers. Each flower is about 1/3" (8 mm.) across, consisting of 5-6 yellow petals, 5 light green sepals, a dense green cluster of pistils, and a ring of surrounding stamens with yellow anthers. The petals are oblong-elliptic and a little shorter than the sepals; the latter tend to hang downward while the flowers are blooming. The pedicels of the flowers are pubescent. The blooming period occurs from mid-spring to early summer and lasts about 1 month. Both sepals and petals are deciduous and they soon fall to the ground. The pistils become transformed into a dense cluster of flat-sided achenes with slender hooked beaks; this fruit is globoid in shape. Eventually, the fruit changes in color from green to nearly black. Each achene is about 2-3 mm. long. The root system consists of a cluster of fibrous roots and occasional rhizomes. Sometimes, small clonal colonies of plants are produced.

Cultivation: The preference is light to medium shade, wet to moist conditions, and soil with abundant organic material.

Range & Habitat: The native Hooked Buttercup is widely distributed in Illinois, but it is found only occasional in most areas (see Distribution Map). Habitats include damp depressions in upland woodlands, floodplain woodlands, shaded areas along streams, bottoms of rocky ravines, areas along woodland paths, swamps, forested bogs, and shady seeps. This species prefers damp woodlands and shaded wetlands.

Faunal Associations: The nectar of the flowers attracts primarily small bees. These include Cuckoo bees (Nomada spp.), Halictid bees (Augochlorella spp., Lasioglossum spp.), and Andrenid bees (Andrena spp.). Among vertebrate animals, the Wood Duck, Ruffed Grouse, and Wild Turkey feed on the seeds and foliage of Ranunculus spp. (Buttercups) in woodlands. The Eastern Chipmunk also eats the seeds of these plants. Hoofed mammalian herbivores usually avoid the consumption of buttercups because the toxic foliage contains a blistering agent that can irritate the mouth and gastrointestinal tract.

Photographic Location: Along a stream at the bottom of a rocky ravine at The Portland Arch in west-central Indiana.

Comments: This buttercup has achenes with unusually long hooked beaks; this provides its fruit with a slightly spiny appearance. While its foliage is reasonably attractive, the flowers are not very showy. Other similar buttercups include Ranunculus abortivus (Small-Flowered Buttercup) and Ranunculus pensylvanicus (Bristly Buttercup), which can be found in wet woodlands as well. Small-Flowered Buttercup has lower leaves that are kidney-shaped and lack lobes, while the palmately cleft leaves of Bristly Buttercup have more narrow lobes. The latter species also blooms later in the year (during the summer) than Hooked Buttercup. Other similar buttercups have larger flowers (at least ½" across) or their fruits (seedheads) are more elongated (ovoid or oblongoid) in shape.
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