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3. Salix Sect. Wilsonia K. S. Hao ex C. F. Fang & A. K. Skvortsov, Novon. 8: 470. 1998.
紫柳组 zi liu zu
Trees or shrubs. Leaf blade oblanceolate, lanceolate, or elliptic to broadly elliptic, margin dentate, subentire, serrulate, or crenate-serrate, apex long acuminate to acute. Flowering nearly coetaneous. Male catkin slender; bracts yellowish green. Male flower: glands adaxial and abaxial, connate at base to form multifid disc; stamens (3 or)4-6(-8). Female catkin rarely with slightly dense flowers, usually pedunculate; peduncle with leaflets. Female flower: adaxial gland usually horseshoe-shaped, semiclasping stipe; ovary narrowly ovoid to ovoid, glabrous, long stipitate; style very short, to 0.3 mm, or absent; stigma capitate or 2-lobed;
A. K. Skvortsov indicates that and Salix dunnii, S. mesnyi, S. nankingensis, S. neowilsonii, S. rosthornii, S. warburgii, and S. wilsonii so closely resemble each other that they may be taken for one variable and widely distributed species.
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Key based on female plants
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| 1 |
Stipe less than 1 mm. |
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(2) |
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Stipe 1-3 mm. |
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(3) |
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| 2 (1) |
Ovary ovoid-conical; bracts broadly ovate; fruiting catkin to 6.5 cm |
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4 Salix mesnyi |
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Ovary ovoid-ellipsoid; bracts ovate or elliptic; fruiting catkin to 5 cm |
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18 Salix nankingensis |
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| 3 (1) |
Female flowers glabrous (but seeds with hairs) |
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17 Salix tengchongensis |
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Female flowers ± pilose. |
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(4) |
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| 4 (3) |
Ovary narrowly ovoid to lanceolate; bracts pilose on both surfaces basally. |
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(5) |
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Ovary ovoid, ellipsoid, or ellipsoid-oblong; bracts either pilose or glabrous on both surfaces or glabrous only abaxially. |
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(8) |
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| 5 (4) |
Bracts ca. as long as stipes; adaxial gland only present, 3-lobed or entire |
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15 Salix dunnii |
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Bracts slightly shorter than stipes; adaxial and abaxial glands present; adaxial gland horseshoe-shaped, semiclasping stipe. |
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(6) |
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| 6 (5) |
Bracts ovate; abaxial gland sometimes not developed; capsule ovoid |
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13 Salix rosthornii |
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Bracts not ovate; abaxial gland present; capsule ovoid-ellipsoid. |
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(7) |
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| 7 (6) |
Catkin 2-4 cm; petiole inconspicuously glandular or not; bracts elliptic |
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11 Salix wilsonii |
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Catkin 4-5.5 cm; petiole gland-tipped; bracts elliptic-obovate |
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10 Salix chaenomeloides |
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| 8 (4) |
Bracts generally glabrous on both surfaces, except for marginal hairs. |
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(9) |
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Bracts pilose on at least 1 surface. |
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(10) |
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| 9 (8) |
Bract margin ciliate |
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7 Salix warburgii |
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Bract margin not ciliate |
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8 Salix balansaei |
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| 10 (8) |
Ovary ovoid; bracts downy on 1 or both surfaces. |
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(11) |
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Ovary ovoid-oblong or ovoid-conical; bracts pilose adaxially or with fewer hairs abaxially. |
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(12) |
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| 11 (10) |
Bracts downy on both surfaces |
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9 Salix cavaleriei |
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Bracts glabrous abaxially |
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5 Salix boseensis |
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| 12 (10) |
Bracts with long, soft hairs adaxially; ovary ellipsoid-oblong or ellipsoid; adaxial gland entire |
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16 Salix chingiana |
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Bracts with short, soft hairs adaxially, with fewer hairs abaxially; ovary ovoid-conical; adaxial gland retuse or lobed |
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6 Salix kusanoi |
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List of Keys
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List of lower taxa
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