Lespedeza Michx. is a genus of approximately 40–45 species of flowering plants in the legume family Fabaceae (order Fabales, subfamily Faboideae, tribe Desmodieae), commonly known as bush clovers or Japanese clovers. The genus was formally described by the French botanist André Michaux in his 1803 work Flora Boreali-Americana, and is named in honor of Vicente Manuel de Céspedes, the governor of East Florida from 1784 to 1790, who supported Michaux's botanical expeditions. The spelling of the name shifted from "Céspedes" to "Lespedez" in Michaux's original publication, giving rise to the Latinized form used today.
Plants range from low, trailing herbaceous vines to multi-stemmed deciduous shrubs, typically bearing trifoliolate leaves. Flowers are pea-shaped (papilionaceous), colored purple to cream-white (ochroleucous), and arranged in racemes or clusters. A distinctive feature of the genus is the production of two flower types: showy petaliferous flowers alongside reduced, apetalous (cleistogamous) flowers that self-fertilize without opening — the two forms sometimes producing morphologically different fruits. Fruit is a single-seeded, indehiscent legume (a loment).
Like all members of Fabaceae, Lespedeza species form root nodules with nitrogen-fixing bacteria, making them valuable for improving degraded or nutrient-poor soils. The genus is native to warm-temperate and subtropical regions of eastern North America, eastern and southern Asia, and Australasia. Vernacular names vary widely: in Japanese the genus is known as Hagi (ハギ属), in Chinese as 胡枝子 (hú zhī zi), and in Korean as 싸리속.
Several species are cultivated as ornamental shrubs and as forage or cover crops, particularly in the southern United States. Conversely, a few Asian species — most notably L. cuneata (Chinese bush-clover) and L. bicolor (shrub lespedeza) — have become invasive outside their native ranges in North America, where they spread aggressively and displace native vegetation.
Etymology
The genus name Lespedeza commemorates Vicente Manuel de Céspedes (1740–1822), who served as Spanish governor of East Florida from 1784 to 1790. When the French botanist André Michaux traveled through the southeastern United States collecting specimens, Céspedes facilitated his access and fieldwork. In his 1803 Flora Boreali-Americana, Michaux rendered the name as "Lespedez" — a phonetic adaptation of "Céspedes" — which was subsequently Latinized to Lespedeza as the accepted genus name.
Distribution
Lespedeza is native to warm-temperate and subtropical regions of eastern North America, eastern and southern Asia (including China, Japan, Korea, and the Indian subcontinent), and Australasia. In North America, species such as L. capitata, L. hirta, and L. procumbens are native to the eastern United States. Asian species predominate in the genus overall, with centers of diversity in China and Japan. Several Asian species (L. bicolor, L. cuneata) have been widely introduced outside their native ranges and are now naturalized across large parts of the eastern and central United States.
Ecology
Lespedeza species share the nitrogen-fixing capability characteristic of the legume family, forming symbiotic root nodules with rhizobial bacteria. This makes them important components of nutrient-cycling in grasslands, forest edges, and disturbed habitats, and valuable as cover crops and soil-restoration plants. Many species occupy dry, open habitats including prairies, roadsides, old fields, and open woodlands. A notable ecological feature of the genus is cleistogamy: plants produce both open, insect-pollinated petaliferous flowers and closed, self-fertilizing apetalous flowers, sometimes differing in fruit morphology — an adaptation that ensures seed set even when pollinators are scarce. Native North American lespedezas are important food sources for quail, turkey, and other wildlife.
Cultivation
Several Lespedeza species are cultivated as ornamental shrubs in temperate gardens, valued for late-summer to autumn flowering. L. thunbergii and L. bicolor are the most commonly grown ornamentals, producing arching branches with clusters of rosy-purple flowers. They tolerate a range of soils, including poor and dry conditions, and prefer full sun. In agriculture, lespedezas — particularly L. cuneata and L. striata — have been extensively used in the southern United States for hay production, grazing, soil erosion control, and reclamation of worn-out soils. Their nitrogen-fixing ability reduces the need for synthetic fertilizers.
Conservation
Several Lespedeza species, particularly L. cuneata (Chinese bush-clover) and L. bicolor (shrub lespedeza), are classified as invasive in parts of eastern and central North America. These Asian species were deliberately introduced for erosion control and wildlife forage but spread aggressively into native grasslands, prairies, and open woodlands, displacing native plant communities. L. cuneata in particular forms dense monocultures that reduce native plant diversity. Multiple US state agencies and conservation organizations list invasive lespedezas as significant land-management concerns.
Propagation
Lespedeza species are most commonly propagated from seed. Seeds benefit from scarification or a 24-hour pre-soak in warm water to break the hard seed coat, followed by sowing in spring. Many annual or herbaceous species can be sown in situ after the last frost. Shrubby ornamental cultivars (e.g., L. thunbergii selections) are propagated by softwood or semi-hardwood cuttings in summer, or by division of established clumps in early spring.
Taxonomy
Lespedeza was described by André Michaux and published in Fl. Bor.-Amer. 2: 70 (1803). It is placed in the family Fabaceae, order Fabales, class Magnoliopsida. Within Fabaceae, the genus belongs to subfamily Faboideae, tribe Desmodieae, subtribe Lespedezinae, of which it is the type genus. GBIF (key 2955600) records over 100 descendant taxa; the genus contains approximately 40–45 recognized species under current circumscription. Accepted species span both North American natives (including L. capitata, L. hirta, L. procumbens, L. repens) and predominantly Asian species (L. bicolor, L. cuneata, L. cyrtobotrya, L. maximowiczii, L. juncea). The genus has historically been treated broadly; some treatments segregate Kummerowia and Campylotropis as distinct genera.
