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Ohio spiderwort's flowers and buds occur in a cluster, each cluster on a hairless flower stalk (pedicel) with a pair of long, leaf-like bracts at its base at the apex of the plant. Individual flowers are about 1-1.5" across, with three green, oval sepals offset from the petals; three rounded blue-violet petals; six stamens with blue filaments and bright yellow anthers; a single blue style with a small white stigma; and fine, thread-like, violet hairs radiating out from the stamen and style bases in the center of the flower. The seed capsules are 4-8 mm long, ovoid, with three distinct compartments. The mature seed capsule splits into three sections, each releasing 3-6 oblong, strongly ribbed, brown seeds. The flowers open early in the morning but close in the afternoon (later on cloudy days). Ohio spiderwort is the commonest spiderwort in Illinois and the only Tradescantia species to occur in Jackson Park; the very similar Virginia spiderwort (Tradescantia virginiana) can be distinguished from Ohio spiderwort by its hairy flower stalks (pedicels).

Tradescantia

Tradescantia ohiensis

Ohio spiderwort [Blooms: Apr-Sep]

In corn speedwell, single flowers 1/8" wide develop at the tips of inflorescences that arise from the axils of the middle and upper leaves; the flowers are nearly sessile. The inflorescence continually elongates, producing new flowers and a series of bracts along its length. The most basal bracts resemble the stem leaf whose axil hosts the inflorescence; the upper bracts are alternate, 3-10 mm long, and narrowly lance-shaped with long hairs fringing the bract margins. Each flower consists of four hairy, green, lance-like sepals/bracts longer than the corolla lobes; a blue to blue-violet corolla with four petal-like lobes, the upper three lobes slightly larger than the lower forth lobe; two stamens with white anthers; and a pistil with a single style. Dark lines (nectar guides) radiate from the throat of the corolla. Each flower only lasts a single day. The fruit is a 1/8" long and wide, tan, heart-shaped seed capsule, somewhat flattened, with two compartments containing 10-30 yellowish, ovoid seeds. There are 16 species of the genus Veronica reported from Illinois. I have only seen three (Veronica arvensis, Veronica polita, and Veronica serpyllifolia) in Jackson Park but, given their minute size and inconspicuousness, it seems likely that more remain to be found.

Veronica

Veronica arvensis

corn speedwell [Blooms: Apr-Jun]

Wayside speedwell's flowers are 1/4" across with a green, hairy calyx with four triangular lobes as long as the petals, projecting between them in the spaces between petals; a short corolla with four spreading lobes, three the same size (one on either side, blue to bluish-white with dark blue lines, and the third dark blue with blue-violet lines) and one about half as wide, pale blue or white with light blue lines. The blue lines function as nectar guides. The base of all four lobes is bright white, but the center of the flower is greenish. There are two white stamens with white anthers (backed by a dark blue "U" shape) and a single white pistil emerging from the throat of the corolla. The fruits are heart-shaped capsules with two chambers covered with glandular hairs, each containing 8-12 seeds. The flowers and leaves of wayside speedwell are similar to those of bird's-eye speedwell (Veronica persica), but the calyx lobes of bird's-eye speedwell do not project beyond the petals. There are 16 species of the genus Veronica reported from Illinois. I have only seen three (Veronica arvensis, Veronica polita, and Veronica serpyllifolia) in Jackson Park but, given their minute size and inconspicuousness, it seems likely that more remain to be found.

Veronica

Veronica polita

wayside speedwell [Blooms: Apr-Jun]

American wisteria's flowers occur in showy terminal racemes. The flowers have 1/2" long pedicels that are densely covered with stiff hairs and some club-shaped, stalked glands. Individual flowers consist of a 1/4-3/8"white to pale green, hairy calyx and 15-20 mm long bluish-purple, pea-like, hairless flowers. The expanded portion of the banner (or standard) is bent backwards so it is perpendicular to the axis of the rest of the flower; the two lateral petals cover the keel like a hood. There are 10 stamens with tiny anthers, an ovary encircled by a nectar gland, and a single style hidden within the keel; nine of the 10 stamens are fused to each other, the tenth is free. The fruits are 2.75-4" long pea-like, hairless green pods containing 4-8 kidney-shaped or oval seeds, each about 8 mm wide; the pods are brown and the seeds are black when mature. The seeds contain an alpha-amino acid called canavanine which is structurally similar to L-arginine and the pods contain a saponin called wisterin; neither is a good thing to ingest. I've only seen American wisteria growing on the fence west of Japanese Garden. Periodically, the Park District cuts it down, I suspect because they fear for the fence's structural integrity (it's a heavy plant), but I wish a better solution could be found given American wisteria's rarity.

Wisteria

Wisteria frutescens

American wisteria [Blooms: May-Oct]