Ivy leaved speedwells (Veronica hederifolia and V. sublobata)

 Key to distinguish Veronica sublobata from Veronica hederifolia:

1. Pedicel length (at least in fruit) 3–4(-6) times calyx length, usually with few to many randomly scattered long (>width of pedicel) spreading hairs, sometimes also with a single line of short hairs; corollas pale violet, purple, pink or whitish, the interior without a contrasting white (although paler) center, 4–5(-6) mm diam; styles 0.2–0.7 mm long ......................................................... Veronica sublobata
2. Pedicel length 2–3 times calyx length, with a single line of short (< width of pedicel) hairs; corollas blue with a strongly contrasting bright white center, 5–7(-9) mm diam; styles (0.6-)0.7–0.9(-1.1) mm long ...................................... Veronica hederifolia s.str.

Germander speedwell (Veronica chamaedrys)

Purslane Speedwell (Veronica peregrina)

Ivy-Leaved Speedwell (Veronica hederifolia)

Thyme-Leaved Speedwell (Veronica serpyllifolia)

Common Speedwell (Veronica officinalis)

Corn Speedwell (Veronica arvensis)

 

Slender Speedwell (Veronica filiformis)

Very similar to bird's eye speedwell (V. persica), also to ivy leaved (V. hederifolia) and pink ivy leaved (V. subulata) and gray field (V. polita) speedwells. 

This species has small, round leaves and very long stems on flowers, much more than twice the length of leaves. Flowers are less than 1/2 inch across. leaves are very sparse. 

The ivy-leaved speedwells have leaves wider than long with a very broad terminal lobe. The leaves overall are larger than these (more than 1/2 inch)

Bird's eye speedwell has flowers over 1/2 inch and leaves longer than wide with lots of teeth and over 1/2 inch. 

Gray field speedwell has flowers smaller than leaves, leaves longer than wide, over 1/2 inch long and toothy, with flower stems shorter than leaves. 

Gray Field Speedwell (Veronica polita)

 Very similar to bird's eye (V. persica) and slender (V. filiformis) speedwells. This is a mat-forming speedwell with medium-sized (for a speedwell) bright blue flowers in early spring (April). Its leaves are longer than wide and have several deep teeth (unlike the broader than wide ivy leaved (V. hederfolia) and pink ivy leaved (V. sublobata) speedwells)

Bird's eye has bigger flowers, more than half an inch across, that look nearly the same size as the leaf. Bird's eye's flowers and especially fruit are on stems at least as long as the leaf. 

Slender has much smaller, round leaves and again the flower stem is longer than the leaf, and the flower looks about as big as a leaf. 

In gray field speedwell (this species) the flowers are not larger than 1/2 inch, not larger than the leaf, not on stems longer than the leaf, and the stems have a mix of hairs of different lengths that like to stand out from the stem. 

American Plantain (Plantago rugelii)

turtlehead (Chelone glabra)

Broad-Leaved Plantain (Plantago sp.)

Thyme-Leaved Speedwell

Corn Speedwell

Foxglove Beardtongue

Butter-and-Eggs

Speedwell

English Plantain (Plantago lanceolata)