| 1 |
Leaves serrate; endocarp divided at maturity into 2 2-seeded pyrenes. |
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(2) |
| + |
Leaves entire; endocarp divided at maturity into 4 1-seeded pyrenes. |
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(4) |
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| 2 (1) |
Leaves glabrous, teeth antrorse, apiculate; corolla lobes longer than tube; drupes 3-4 mm in diam. |
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1 Ehretia acuminata |
| + |
Leaves pubescent abaxially, teeth spreading, not apiculate; corolla lobes shorter than tube; drupes 6-15 mm in diam. |
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(3) |
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| 3 (2) |
Leaf base cuneate to rotund, blade pubescent adaxially; drupes 10-15 mm in diam. |
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3 Ehretia dicksonii |
| + |
Leaf base cordate, blade densely tomentose adaxially; drupes 3-4 mm in diam. |
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2 Ehretia corylifolia |
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| 4 (1) |
Corolla lobes longer than tube. |
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(5) |
| + |
Corolla lobes shorter than tube. |
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(7) |
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| 5 (4) |
Inflorescences and calyx densely yellow-brown pubescent, ebracteate |
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14 Ehretia laevis |
| + |
Inflorescences glabrous or nearly so, with linear or linear-lanceolate bracts. |
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(6) |
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| 6 (5) |
Petiole tuberculate; leaf blade broadly elliptic to oblong-elliptic, apex obtuse or mucronate; flowers pedicellate |
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12 Ehretia asperula |
| + |
Petiole smooth; leaf blade lanceolate to oblong-lanceolate, apex acute; flowers sessile |
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13 Ehretia hainanensis |
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| 7 (4) |
Corolla tube cylindric; calyx lobes linear, 5-6 mm. |
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(8) |
| + |
Corolla tube distinctly wider distally; calyx lobes ovate to oblong, 1.5-3.5 mm. |
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(9) |
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| 8 (7) |
Calyx 4-6 mm; stamens inserted at apex of corolla tube |
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4 Ehretia resinosa |
| + |
Calyx ca. 3 mm; stamens inserted at middle of corolla tube |
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5 Ehretia densiflora |
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| 9 (7) |
Cymes terminal; corolla funnelform, 5.5-6.5 mm; filaments ca. 1.5 mm |
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6 Ehretia confinis |
| + |
Cymes terminal and lateral; corolla tube campanulate, 7-11 mm; filaments ca. 3-6 mm. |
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(10) |
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| 10 (9) |
Leaf blade with evident reticulate venation. |
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(11) |
| + |
Leaf blade with only midvein and lateral veins conspicuous. |
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(12) |
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| 11 (10) |
Inflorescences and calyx obscurely pubescent with glandular hairs |
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7 Ehretia tsangii |
| + |
Inflorescences and calyx with rust-colored glandular hairs |
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8 Ehretia dunniana |
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| 12 (10) |
Petiole, calyx, and corolla densely rust-colored pubescent |
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9 Ehretia pingbianensis |
| + |
Petiole and corolla glabrous, calyx ciliate. |
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(13) |
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| 13 (12) |
Corolla 10-11 mm, lobes ovate; filaments 8-10 mm, inserted 3.5-5 mm above base |
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10 Ehretia longiflora |
| + |
Corolla 6.5-8 mm, lobes oblong-lanceolate; filaments 2.5-3 mm, inserted just below throat |
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11 Ehretia changjiangensis |
