|Photo by John R. Gwaltney, Southeastern Flora.com|
|Division:||Magnoliophyta - Flowering plants|
|Class:||Magnoliopsida – Dicotyledons|
|Family:||Fabaceae ⁄ Leguminosae|
| Desmodium rotundifolium|
|Natural range of Desmodium rotundifolium from USDA NRCS Plants Database.|
Common name: Roundleaf tick-trefoil
Synonym: Meibomia michauxii Vail
Flowers may be blue or light purple in northern states.  In southern areas, fresh corollas are rosy pink, then fading into a whitish color with age.  Creeping and trailing habit and prostrate.
Generally, for Desmodium genus, they are "annual or perennial herbs, shrubs or small trees. Leaves 1-5 foliolate, pinnately 3-foliolate in ours or rarely the uppermost or lowermost 1-foliolate; leaflets entire, usually stipellate; stipules caduceus to persistent, ovate to subulate, foliaceous to setaceous, often striate. Inflorescence terminal and from the upper axils, paniculate or occasionally racemose; pedicel of each papilionaceous flower subtended by a secondary bract or bractlet, the cluster of 1-few flowers subtended by a primary bract. Calyx slightly to conspicuously 2-lipped, the upper lip scarcely bifid, the lower lip 3-dentate; petals pink, roseate, purple, bluish or white; stamens monadelphous or more commonly diadelphous and then 9 and 1. Legume a stipitate loment, the segments 2-many or rarely solitary, usually flattened and densely uncinated-pubescent, separating into 1-seeded, indehiscent segments." 
Specifically, for D. rotundifolium species, they are "perennial with trailing, densely villous or very rarely glabrate stems 0.5-1.5 m long. Terminal leaflets suborbicular to widely rhombic or obovate, 3-7 cm long, densely appressed to spreading pilose on both surfaces; stipules persistent, ovate, obliquely and widely clasping at base, 8-12 mm long; stipels usually persistent. Inflorescences typically axillary, occasionally terminal, racemose to paniculate; pedicels 6-13 mm long. Calyx sparsely pilose to puberulent; petals purple, 8-10 mm long; stamens diadelphous. Loment of (3) 4-6 segments, each 5-7 mm long, 4-5 broad, both sutures and sides densely uncinlate, both margins about equally indented; stipe 2.5-5 mm long, mostly included within calyx tube and exceeded by stamina remnants." 
It is found in mixed hardwoods including pines, oaks, and hickories. It is also found in lightly wooded hillsides, dry glacial drift, and open woods. It requires shaded areas. It is associated with drying sandy loam soil types.
Associated species include Desmodium lineatum, Desmodium ochroleucum, Rhynchosia difformis, Smilax pumila, Rhus aromatica.
It becomes more robust in response to fire.
Use by animals
The leaves are browsed by deer. The seeds are consumed by bobwhite quail, turkey, and the ruffled Grouse. The plant is a larval host for the Variegated Frittilary butterfly (Euptoieta claudia) and the Southern Cloudywing (Thorybes bathyllus). 
Conservation and management
Cultivation and restoration
References and notes
- Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: June 2014. Collectors: L. C. Anderson, Wilson Baker, Patricia Elliot, H. Roth, V Craig, Bill Boothe, Marcia Boothe, Billie Bailey, G. W. Parmelee, H. A. Wahl, Norlan C. Henderson, Harry E. Ahles, R. S. Leisner, H. R. Reed, Charles M. Allen, Peter Raven, Tamra E. Raven, and R. Kral. States and Counties: Indiana: Huntington. Florida: Gadsden, Jackson, and Liberty. Louisiana: Allen. Michigan: Barry. Mississippi: Pearl River. Missouri: Jefferson and Stone. North Carolina: Stanley. Pennsylvania: Bradford and Venango. Tennessee: Grundy.
- Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 604-6. Print.
- Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. www.gilnelson.com/PanFlora/ Accessed: 8 DEC 2016
- http://ozarkedgewildflowers.com/summer-wildflowers/dollar-leaf-desmodium-rotundifolium/ Ozark Edge Wildflowers. Accessed: April 21, 2016.