| 1 |
Stems winged; corolla tube as long as wide; corolla lobes as long as tube. |
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(2) |
| + |
Stems terete or angular (but usually winged in V. brunonianum subsp. sutchuense); corolla tube longer than wide; corolla lobes shorter than tube (equal to tube in V. rhombifolia and V. axillare). |
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(3) |
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| 2 (1) |
Stems ca. 100 cm tall; leaf blade oblong, ovate, or lanceolate |
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10 Veronicastrum caulopterum |
| + |
Stems 15-30 cm tall; leaf blade linear to elliptic |
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11 Veronicastrum formosanum |
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| 3 (1) |
Corolla slightly to conspicuously 2-lipped, lower lobes reflexed, upper often galeate; seed coat transparent. |
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(4) |
| + |
Corolla actinomorphic, lobes straight; seed coat not transparent. |
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(5) |
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| 4 (3) |
Stems herbaceous, erect; leaves sessile, narrowly elliptic; corolla conspicuously 2-lipped, lower lobes strongly reflexed |
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1 Veronicastrum brunonianum |
| + |
Stems woody, climbing; leaves petiolate, blade ovate to ovate-lanceolate; corolla slightly 2-lipped, lower lobes not strongly reflexed |
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2 Veronicastrum yunnanense |
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| 5 (3) |
Inflorescences terminal on main stems; flowers pedicellate; leaves sessile. |
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(6) |
| + |
Inflorescences axillary or terminal on branches (sometimes terminal on main stem in V. stenostachium); flowers sessile; leaves short petiolate to subsessile. |
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(7) |
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| 6 (5) |
Leaves in whorls of 4-6, oblong to broadly linear, 1.5-4.5 cm wide |
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12 Veronicastrum sibiricum |
| + |
Leaves alternate, linear, ca. 0.6 cm wide |
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13 Veronicastrum tubiflorum |
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| 7 (5) |
Bracts ovate-orbicular or ovate-lanceolate; corolla tube subglabrous inside |
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8 Veronicastrum robustum |
| + |
Bracts linear-lanceolate to subulate; corolla tube with a ring of villous hairs inside. |
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(8) |
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| 8 (7) |
Leaves rhomboid, rarely rhomboid-ovate; corolla lobes 1/3-1/2 of corolla length |
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9 Veronicastrum rhombifolium |
| + |
Leaves not rhomboid (rhomboid-ovate in V. villosulum); corolla lobes 1/6-1/4 of corolla length (1/3-1/2 in V. axillare). |
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(9) |
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| 9 (8) |
Ovaries and young fruit hairy; inflorescence axes, bracts, and calyx lobes densely capitate glandular or hispidulous |
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3 Veronicastrum longispicatum |
| + |
Ovaries and young fruit glabrous; inflorescence axes, bracts, and calyx lobes not densely capitate glandular (bracts and calyx lobes sometimes densely pubescent in V. villosulum var. villosulum and var. hirsutum). |
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(10) |
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| 10 (9) |
Corolla lobes 1/3-1/2 of corolla length; stems angular in middle and apically |
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6 Veronicastrum axillare |
| + |
Corolla lobes 1/6-1/4 of corolla length; stems terete, sometimes apically angular. |
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(11) |
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| 11 (10) |
Inflorescences less than 1.5 cm |
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7 Veronicastrum villosulum |
| + |
Inflorescences 1.5-8 cm. |
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(12) |
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| 12 (11) |
Leaves narrowly ovate to lanceolate, 7-20 cm |
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4 Veronicastrum stenostachyum |
| + |
Leaves ovate-orbicular to orbicular, 4-7 cm |
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5 Veronicastrum latifolium |
