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    Yellow Woodsorrel - also known as Oxalis, is a summer annual, that can be perennial in some areas. Yellow Woodsorrel grows on weak stems that branch at the base and may root at the nodes. The leaves form in groups of three leaflets on long petioles, and are alternate on the stems. Although sometimes mistaken for clover when not in flower, the leaves differ from clover in that they are distinctly heart shaped. The Yellow Woodsorrel flower is yellow with five petals and occurs in clusters. The seed pods range from 1/2 - 1 inch in length, have 5 ridges and are pointed. Yellow Woodsorrel spreads by seeds which burst from the pods at maturity and may be scatted several feet.

    Paleseed Plantain - is a winter annual, sometimes a biannual. The leaves form in a basal rosette. The leaves are oblanceolate in shape, usually having smooth edges, soft hairs and ranging from 2 - 4 inches in length. Paleseed plantain forms a taproot. Paleseed plantain spreads from seed that is produced from flowers present in late spring. The seedhead is formed in a rat tail shape similar to broadleaf plantain.

    Parsley-Piert - is a low growing winter annual. The fan shaped hairy leaves alternate on the stems. The leaves contain three lobes and each lobe is subdivided again into 3 - 4 lobes. The flowers are inconspicuous in the leaf axis. Parsley-piert spreads by seed.

    Pineapple Weed - is a summer annual. When the plant is crushed, it has the odor of a pineapple. The hairless leaves are divided into very narrow segments, and are arranged alternately on the stems originating from a taproot. The plant has a bushy growth habit resulting from branching from lower stems. Flowers which are yellow in color are produced from May through August. One to several flowers are produced at the end of short stems. Pineapple weed spreads by seed.

    Poison Oak - is identified by 1 ½ to 3 inch long leaflets with two to seven deep lobes resembling oak leaves. Lateral leaflets appear without stalks on viny stems about 3 to 4 feet tall. Like poison ivy, leaflets are grouped three per leaf, and flowers are yellowish.

    White Prairieaster - as well as purple aster and hairy golden aster, is a perennial weed which can reach 1/2 to 2 feet tall in non-turf situations. Purple aster and hairy golden aster reproduce by seed only; white prairieaster, however, also reproduces by creeping underground roots. Some asters have more sparse or dense hairy leaves and may be fleshy or firm with a linear lance shape. Stems have many branches. Flowers of asters are clustered at the ends of the branched stems and appear from July through October. Asters, especially white prairieaster, can become a competitive problem in turf areas where soil conditions are moist, especially in heavy clay soils.

    Puncture Vine - is a summer annual. The leaves are opposite and even-pinnately compound composed of 8 - 16 hairy leaflets. The stems are prostrate mat forming originating from a taproot. The flowers are solitary, consisting of 5 yellow petals, and are found in the leaf axils. The fruit which contains 1 - 4 seeds contains 2 - 4 spines. Puncture vine spreads by seed which can remain viable for years.

    Purslane - is a summer annual with prostrate growth from a tap root and fibrous surface roots. The leaves are thick and waxy, resembling a Jade plant. The leaves usually alternate, with a cluster at the tip of the stem. Stems are thick, red in color, and branch out from a central point, forming a mat up to 1 foot in diameter. The flower is solitary, yellow in color and has 5 petals. The flower is found in the leaf axis or at the tip of the stem. Purslane flowers from May to November and spreads by seeds, which germinate in the spring, or by stem fragments.

    Rabbitfoot Clover - is a winter annual. Rabbitfoot clover has a multi-branched growth habit. Both the stems and leaves are densely haired. The leaves consist of 3 narrow leaflets with minute teeth-like projections at the tips. The flowers of rabbitfoot clover are small pink to purple and are clustered in grayish soft-silky cylinder-shaped heads. Rabbitfoot clover reproduces by seed, and flowers in the spring.

    Red Sorrel - also referred to as sheep sorrel, is a summer perennial. The leaves alternate and form a basal rosette. The older leaves are arrowhead shaped with two basal lobes attached to a petiole. Leaves formed along the stem are more elongated and usually lack the basal lobes. The margins of the leaf are smooth. The leaves become thick and fleshy over the summer months. The root red sorrel is a shallow yellow taproot, combined with multiple rhizomes. Flowers are produced from May to September. Male and female flowers are produced on separate plants. The male flowers are yellow-green and the female flowers are reddish-brown. The flowering stems of red sorrel can be one or many developing from a crown or rhizome. Red sorrel spreads by seeds and rhizomes.

    Sandbur - is a summer annual grass. Sandbur forms clumps due to lack of rhizomes and stolons, but can root at nodes on the stems if they touch the ground. The leaves are folded in the bud, the ligule is a fringe of hairs, auricles are absent. The plant turns brown in winter. The seedhead of sandbur consists of a spike like raceme containing spined or burred seeds. The seeds catch on clothing or animal fur.

    Virginia Pepperweed - or peppergrass, is a winter annual. The lower leaves of Virginia pepperweed form from a basal rosette, and are deeply lobed. The stem of Virginia pepperweed is erect and freely branched. The mature plant does not contain any basal rosette leaves, and the leaves on the stem are alternate and more lanceolate than the basal leaves. The flower of Virginia pepperweed is produced from May through early summer. The flowers are white and form in a finger-like cluster or bottle-brush at the top of the plant. The seeds of Virginia pepperweed germinate in late summer or early fall. Limited germination occurs in the spring.