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corn speedwell, speedwell, véronique des champs, wall speedwell

trilobed speedwell

Habit Annuals. Annuals.
Stems

erect to ascending, 1–30(–40) cm, glandular- or eglandular-hairy.

decumbent, (5–)10–30 cm, ± eglandular-hairy.

Leaves

in 3–6 pairs per stem;

blade oblong to broadly ovate, (2–)5–14(–35) × (2–)3–10(–18) mm, 2.5 times as long as wide, base truncate, margins crenate-serrate, apex obtuse to rounded, surfaces sparsely eglandular-hairy, rarely also glandular-hairy.

blade broadly ovate to suborbiculate, 3(–5)-lobed, central lobe 1/4–1/2 times length of whole leaf, (3–)5–10(–15) × (4–)6–12(–18) mm, ± fleshy, base truncate to subcordate, margins 3(–5)-lobed, apex acute, surfaces sparsely eglandular-hairy.

Racemes

1(–3), terminal, 20–150 mm, (5–)15–40(–60)-flowered, axis densely eglandular- and glandular-hairy;

bracts linear-oblong, (3.5–)4–6(–10) mm.

1–10, terminal, (50–)100–300 mm, 5–20-flowered, axis sparsely eglandular-hairy;

bracts broadly ovate to suborbiculate, 3(–5)-lobed, (3–)5–10(–15) mm.

Pedicels

erect, 0–4 mm, shorter than subtending bract, densely eglandular- and glandular-hairy.

patent, deflexed in fruit, (2–)4–8(–10) mm, shorter than subtending bract, length 1–2 times calyx, glabrous abaxially, hairy adaxially.

Flowers

calyx lobes (2–)3.5–5(–6) mm, 0.8–2 mm wide, apex acute, glandular-hairy;

corolla sky blue to intense blue, 2–4 mm diam.;

stamens 0.3–0.5 mm;

style (0.2–)0.4–0.6(–1) mm.

calyx lobes 4–5(–6) mm, apex acute, puberulent on abaxial surface, rarely glabrous, densely ciliate with 35–60 per side;

corolla deep blue with white center, 3–5 mm diam.;

stamens dark blue, length unknown;

style 0.5–0.9(–1.1) mm.

Capsules

compressed in cross section, obcordiform, 2–4 × 2.5–5 mm, apex markedly emarginate, glandular-ciliate, otherwise glabrous.

± round in cross section, ovoid, 2.5–3(–3.5) × 4–5 mm, apex ± emarginate, glabrous.

Seeds

10–30, yellowish, ovoid, flat, 0.7–1.7 × 0.4–1 mm, 0.2–0.4 mm thick, rugose.

(1–)4, dull yellowish brown, ellipsoid, often elongate-cuboidal, deeply urn-shaped (elaiosome inside), 2.2–2.8 × 1.5–2.2 mm, 1–1.4 mm thick, cristate to strongly rugose at margins.

2n

= 16.

= 18 (Eurasia).

Veronica arvensis

Veronica triloba

Phenology Flowering (Feb–)Mar–Jun(–Oct). Flowering (Feb–)Mar–May(–Jun).
Habitat Disturbed sites, lawns, fields, open forests, scrub, grasslands, rocky sites, coasts. Disturbed sites.
Elevation 0–2900 m. (0–9500 ft.) 100–200 m. (300–700 ft.)
Distribution
from FNA
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; BC; NB; NF; NS; ON; PE; QC; YT; Atlantic Islands; Pacific Islands; Greenland; Africa; Eurasia; Australia [Introduced in North America; introduced also in Mexico, Central America]
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; OH; Europe (Balkans); Asia (Turkey) [Introduced in North America]
Discussion

Veronica triloba is known in the flora area from three recent collections in California and Ohio; it is possibly more widespread than reported here. It is closely related to V. hederifolia.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 17, p. 317. FNA vol. 17, p. 316.
Parent taxa Plantaginaceae > Veronica Plantaginaceae > Veronica
Sibling taxa
V. agrestis, V. alpina, V. americana, V. anagallis-aquatica, V. argute-serrata, V. beccabunga, V. biloba, V. catenata, V. chamaedrys, V. copelandii, V. cusickii, V. cymbalaria, V. dillenii, V. filiformis, V. fruticans, V. grandiflora, V. hederifolia, V. longifolia, V. officinalis, V. peregrina, V. persica, V. polita, V. scutellata, V. serpyllifolia, V. spicata, V. stelleri, V. sublobata, V. teucrium, V. triloba, V. triphyllos, V. undulata, V. verna, V. wormskjoldii
V. agrestis, V. alpina, V. americana, V. anagallis-aquatica, V. argute-serrata, V. arvensis, V. beccabunga, V. biloba, V. catenata, V. chamaedrys, V. copelandii, V. cusickii, V. cymbalaria, V. dillenii, V. filiformis, V. fruticans, V. grandiflora, V. hederifolia, V. longifolia, V. officinalis, V. peregrina, V. persica, V. polita, V. scutellata, V. serpyllifolia, V. spicata, V. stelleri, V. sublobata, V. teucrium, V. triphyllos, V. undulata, V. verna, V. wormskjoldii
Synonyms V. hederifolia var. triloba
Name authority Linnaeus: Sp. Pl. 1: 13. (1753) (Opiz) Opiz: Naturalientausch 11: 467. (1826)
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