Burke: Veronica serpyllifolia vs. Veronica arvensis

	Veronica serpyllifolia	Veronica arvensis
	thyme-leaved speedwell	corn speedwell, wall speedwell
Habit	Perennial from branching, creeping rhizomes, the stems 1-3 dm. long, finely puberulent, often producing prostrate, lower branches, otherwise simple.	Taprooted annual, somewhat hairy below and puberulent above, the stem erect to nearly prostrate, 0.5-3 dm. long, simple or branched below.
Leaves	Leaves opposite, elliptic to broadly ovate, 1-2.5 cm. long and 0.5-1 cm. wide, glabrous, entire or slightly toothed, the lower often short-petiolate, the others sessile.	Leaves opposite, ovate to broadly elliptic, 1.5-2.5 cm. long and half as wide to nearly as wide as long, with rounded serrations, the lower short-petiolate, the upper sessile.
Flowers	Flowers on short pedicels in a loose, elongate, terminal raceme, the upper subtending bracts alternate; sepals 4; corolla bright blue to white, 4-8 mm. wide, rotate, 4-lobed, the upper lobe the largest; style 2-3.5 mm. long; stamens 2.	Inflorescence a terminal, bracteate, condensed or elongate, spike-like raceme; bracts alternate, narrower than the leaves, each subtending a single flower; calyx of 4 sepals; corolla blue-violet, 2-2.5 mm. wide, rotate, 4-lobed, the upper lobe the largest; pedicels 1-2 mm. long; style 0.4-1 mm. long; stamens 2.
Fruits	Capsule 3-4 mm. high, broader than high, notched, finely glandular-pubescent,	Capsule 3 mm. high, obcordate.

	Veronica serpyllifolia	Veronica arvensis
Flowering time	May-August	April-September
Habitat	Moist meadows and shores, from the lowlands to the subalpine.	Disturbed ground, gardens and roadsides
Distribution	Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America. [WildflowerSearch map] [BONAP county map]
Origin	Both native and introduced	Introduced from Eurasia
Conservation status	Not of concern	Not of concern
Sibling taxa	V. americana, V. anagallis-aquatica, V. argute-serrata, V. arvensis, V. catenata, V. chamaedrys, V. cusickii, V. dissecta, V. filiformis, V. hederifolia, V. ×lackschewitzii, V. longifolia, V. missurica, V. officinalis, V. peregrina, V. persica, V. polita, V. regina-nivalis, V. rubra, V. schizantha, V. scutellata, V. triphyllos, V. verna, V. wormskjoldii	V. americana, V. anagallis-aquatica, V. argute-serrata, V. catenata, V. chamaedrys, V. cusickii, V. dissecta, V. filiformis, V. hederifolia, V. ×lackschewitzii, V. longifolia, V. missurica, V. officinalis, V. peregrina, V. persica, V. polita, V. regina-nivalis, V. rubra, V. schizantha, V. scutellata, V. serpyllifolia, V. triphyllos, V. verna, V. wormskjoldii
Subordinate taxa	V. serpyllifolia var. humifusa, V. serpyllifolia var. serpyllifolia
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Veronica serpyllifolia

Veronica arvensis

thyme-leaved speedwell

corn speedwell, wall speedwell

Habit

Perennial from branching, creeping rhizomes, the stems 1-3 dm. long, finely puberulent, often producing prostrate, lower branches, otherwise simple.

Taprooted annual, somewhat hairy below and puberulent above, the stem erect to nearly prostrate, 0.5-3 dm. long, simple or branched below.

Leaves

Leaves opposite, elliptic to broadly ovate, 1-2.5 cm. long and 0.5-1 cm. wide, glabrous, entire or slightly toothed, the lower often short-petiolate, the others sessile.

Leaves opposite, ovate to broadly elliptic, 1.5-2.5 cm. long and half as wide to nearly as wide as long, with rounded serrations, the lower short-petiolate, the upper sessile.

Flowers

Flowers on short pedicels in a loose, elongate, terminal raceme, the upper subtending bracts alternate;

sepals 4;

corolla bright blue to white, 4-8 mm. wide, rotate, 4-lobed, the upper lobe the largest;

style 2-3.5 mm. long;

stamens 2.

Inflorescence a terminal, bracteate, condensed or elongate, spike-like raceme;

bracts alternate, narrower than the leaves, each subtending a single flower;

calyx of 4 sepals;

corolla blue-violet, 2-2.5 mm. wide, rotate, 4-lobed, the upper lobe the largest;

pedicels 1-2 mm. long;

style 0.4-1 mm. long;