Veronica biloba
Veronica argute-serrata
bilobed speedwell, twolobe speedwell
bilobed speedwell, sawtooth speedwell, twolobed speedwell
erect, (1–)2–10(–18) cm, eglandular-hairy.
erect, (7–)10–20(–30) cm, eglandular- and/or glandular-hairy.
blade ovate to lanceolate-ovate, (3–)4–12(–20) × (1–)2–6(–12) mm, base cuneate, margins remotely serrate, rarely dentate, apex acute, surfaces glabrate.
blade lanceolate or elliptic, (6–)12–28(–35) × 3–12(–20) mm, base cuneate, margins serrate, teeth 4–7(–12) per side, apex acute, surfaces sparsely glandular-hairy or glabrate.
1–8, terminal, 20–80 mm, 5–15(–30)-flowered, axis eglandular- and glandular-hairy;
bracts lanceolate, 6–9 mm, margins entire, apex acute.
1–8, terminal, usually reduced and replaced by 2 pseudodichotomous racemes with additional axillary racemes, 80–150 mm, (5–)10–25(–35)-flowered, axis eglandular- and/or glandular-hairy;
bracts lanceolate, 9–12 mm, proximals with margins serrate, distals sometimes entire.
straight or scarcely deflexed, erect-spreading to horizontally spreading in fruit, (2–)3–8(–11) mm, shorter than subtending bract, eglandular-hairy, sometimes glandular-hairy, rarely glabrous.
erect-patent to spreading proximally, deflexed distally, (3–)6–9(–12) mm, shorter than subtending bract, densely glandular- and eglandular-hairy.
calyx lobes (3–)4–7(–9) mm, margins entire, apex acuminate-acute, pairs connate 0.5–1.5 mm, puberulent or glabrate;
corolla pale to clear blue, 2–4 mm diam.;
stamens 1–2 mm;
style 0.4–0.8(–2) mm.
calyx lobes (5–)6–8.5(–10) mm, apex acuminate-acute, pairs connate 0.8–1.1 mm, glandular- and eglandular-hairy, rarely sparsely hairy;
corolla mostly intense blue with white center, 4–6 mm diam.;
stamens 2.5 mm;
style (0.7–)1–1.3(–1.7) mm.
slightly compressed in cross section, obcordiform, (2.4–)2.8–4(–4.5) × (3–)3.5–5(–6) mm, apex emarginate, eglandular- and/or glandular-hairy, rarely glabrous.
slightly compressed in cross section, 3.5–5 × (4–)5–8 mm, apex emarginate, sinus angle 30–45(–60)°, densely eglandular- and glandular-hairy, rarely eglandular-hairy.
(2–)4–6(–10), bright yellow, oblong, cymbiform, (1.4–)1.7–2(–2.2) × (0.7–)1–1.3 mm, 0.7 mm thick, smooth.
4–10, yellowish brown, oblong to ovoid, cymbiform, 1.5–2.5 × 0.8–1.5 mm, 0.8 mm thick, cristate, dorsally reticulate-verrucate.
= 28 (Asia).
= 18, 42 (Asia).
Veronica biloba
Veronica argute-serrata
Most reports of Veronica biloba pertain to V. argute-serrata. There are gatherings from potentially mixed populations (for example, Mt. Baldy, British Columbia, Lomer 97-118, UBC). Studies on phenotypic plasticity in these two species are necessary to ascertain the diagnostic characters.
Veronica intercedens Bornmüller, native to western Asia, was recently reported from Idaho. It is most similar to V. biloba, distinguished by a large calyx with broadly ovate lobes (3–5 mm versus 2–3.5 mm), the pairs joined by more than one half.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Veronica argute-serrata has been recorded mostly under the name V. biloba and occasionally under V. campylopoda Boissier. Most of the records for V. biloba likely belong under this name. Veronica biloba is also found in the flora area, sometimes mixed with V. argute-serrata; V. campylopoda has not been recorded from the flora area. A chromosome count of 2n = 18 (C. R. Bell 1965) for American material is suspicious because 2n = 42 has been reported multiple times in Turkish plants, and a base chromosome number of × = 9 is not known in related species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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