White Prairie Clover
Bean family (Fabaceae)
Description: This native perennial plant is unbranched or sparsely branched in the upper half, and 1-2½' tall. The pale green central stem has light longitudinal lines. The alternate compound leaves are oddly pinnate and about 2-7" long, consisting of 3-9 pale green leaflets. Each leaflet is linear or narrowly oblanceolate, about 1" long and less than ¼" across. The margins are smooth, and the underside of each leaflet has numerous translucent dots. Both the stems and leaves are hairless. There is a short cylindrical spike of white flowers at the terminus of the central stem and each of the major side stems. This spike is about 1-3" tall and ¾" across. The small flowers form a wreath around the bottom of the spike, which moves upward as the season progresses. Each flower is about ¼" across, with 5 petals and 5 white stamens. The flowers often have a pleasant fragrance. The blooming occurs during early to mid-summer and lasts about a month. The seeds fall a short distance from the mother plant when the wind shakes the cylindrical spikes. The root system consists of a central taproot that can extend 5' into the ground.
Cultivation: The preference is full sun and mesic to dry conditions. The soil can contain significant amounts of loam, clay, sand, or gravel. This plant is slow to develop, but otherwise easy. Foliar disease isn't troublesome. Drought resistance is very good.
Range & Habitat: White Prairie Clover occurs occasionally in scattered counties of Illinois, but it is rare or absent in the SE (see Distribution Map). Habitats include mesic to dry black soil prairies, sand prairies, savannas, openings in upland forests, and limestone glades. It is rarely observed in highly disturbed areas. Recovery from occasional wildfires is good.
Faunal Associations: The flowers are visited primarily by bumblebees, Green Metallic bees, and other Halictine bees. Other occasional visitors include wasps, flies, and small butterflies. These insects seek nectar, although the bees also collect pollen. The caterpillars of the butterfly Colias cesonia (Southern Dogface) feed on the foliage, but this species often fails to overwinter successfully in Illinois. Bean weevils (Acanthoscelides spp.) sometimes eat the seeds. This plant is palatable and high in protein, therefore it is readily consumed by mammalian herbivores of all kinds, including rabbits, groundhogs, deer, and livestock. This can cause difficulties in establishing this plant in some areas. It is possible that small rodents may carry the seeds to their dens. Because of their high mortality rate, some of the seeds will remain uneaten, and thus are dispersed by these rodents.
Photographic Location: Photographs were taken at the Lincoln Book Bindery in Urbana, Illinois.
Comments: White Prairie Clover often occurs in the same habitats as Dalea purpurea (Purple Prairie Clover) – the two are often seen together, although the former begins blooming about 2 weeks earlier than the latter. However, White Prairie Clover is the less common of the two plants. The most obvious difference between them is the coloration of their flowers. In addition, White Prairie Clover tends to have more elongated flowering spikes with hair-like bracts, and its foliage is longer, sparser, with a lighter shade of green. Prior to blooming, it blends into the background of grasses and other forbs rather well, and is easy to overlook.