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FOC | Family List | FOC Vol. 4 | Salicaceae | Salix

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.

Key based on vegetative characters

1 Petiole glandular at apex, or at least some petioles glandular.   (2)
+ Petiole eglandular at apex (sometimes with inconspicuous, glandular dots in S. wilsonii).   (8)
2 (1) Leaves greenish abaxially.   (3)
+ Leaves pale or glaucous abaxially, or both pale or glaucous and greenish   9 Salix cavaleriei
3 (2) Young branchlets, leaves, and petioles glabrous or inconspicuously pilose   18 Salix nankingensis
+ Young branchlets, leaves, and petioles distinctly pilose.   (2)
4 Leaf blade lanceolate, pointed at both ends.   (5)
+ Leaf blade elliptic, ovate, or ovate-lanceolate, base cuneate to rounded.   (6)
5 (4) Branchlets dark purple; leaf blade less than 10 × 2 cm   16 Salix chingiana
+ Branchlets yellow or green; leaf blade to 14 × 2.5-4 cm   12 Salix neowilsonii
6 (4) Leaf blade ovate to elliptic-lanceolate; stipules glabrous or subglabrous; leaf and stipule margin conspicuously and densely glandular dentate   10 Salix chaenomeloides
+ Leaf blade oblong to broadly lanceolate; young leaves and stipules abaxially with long hairs, margin with sparse, small, glandular teeth.   (7)
7 (6) Leaf blade elliptic-lanceolate or oblong, rarely elliptic, 4-7 cm   13 Salix rosthornii
+ Leaf blade oblong-lanceolate or lanceolate, 1.5-3.5 cm (mature leaves unknown)   14 Salix chekiangensis
8 (1) Branchlets and young leaves densely rust-colored or russet pubescent; leaves usually more than 7 cm.   (9)
+ Branchlets and young leaves glabrous or with hairs neither rust colored nor russet; leaves usually less than 6 cm.   (10)
9 (8) Juvenile branchlets purplish red to purplish black; leaves ovate or ovate-elliptic   6 Salix kusanoi
+ Juvenile branchlets brown; leaves oblong or oblong-lanceolate   4 Salix mesnyi
10 (8) Branchlets and young leaves glabrou.   (11)
+ Branchlets and young leaves white or gray pubescent.   (13)
11 (10) Leaf blade oblong or obovate-oblong   5 Salix boseensis
+ Leaf blade lanceolate, oblanceolate, or ovate-lanceolate.   (12)
12 (11) Leaf blade lanceolate or oblanceolate   17 Salix tengchongensis
+ Leaf blade ovate-lanceolate   8 Salix balansaei
13 (10) Branchlets dull brown, glabrous or pilose; leaf apex acuminate   11 Salix wilsonii
+ Branchlets purple, densely pilose; leaf apex obtuse or acute.   (14)
14 (13) Leaf blade elliptic-lanceolate or elliptic, both surfaces white downy, hairs denser along veins or abaxially   15 Salix dunnii
+ Leaf blade oblong-elliptic or elliptic, both surfaces glabrous   7 Salix warburgii

List of Keys

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