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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 male plants

1 Stamens 5-12; filaments with long, soft hairs at base.   (2)
+ Stamens 3-6(-8); filaments pubescent or tomentose at base.   (5)
2 (1) Petiole ± glandular distally.   (3)
+ Petiole eglandular distally.   (4)
3 (2) Catkin densely flowered at anthesis, more than 8 mm thick   9 Salix cavaleriei
+ Catkin laxly flowered at anthesis, less than 8 mm thick   10 Salix chaenomeloides
4 (2) Bracts broadly ovate, abaxially subglabrous   4 Salix mesnyi
+ Bracts broadly elliptic or ovate, abaxially pilose   6 Salix kusanoi
5 (1) Male catkin densely flowered; rachis nearly completely covered by bracts and filaments.   (6)
+ Male catkin laxly flowered; internodes between flowers slightly longer than bracts, i.e., rachis conspicuous.   (7)
6 (5) Catkin less than 3 cm; stamens usually 5, rarely 3(or 6); bracts glabrous abaxially, pilose adaxially   18 Salix nankingensis
+ Catkin more than 3 cm (usually ca. 5 cm); stamens 5 or 6; bracts with sparse hairs abaxially only proximally, pilose adaxially   7 Salix warburgii
7 (5) Bracts long elliptic   12 Salix neowilsonii
+ Bracts narrowly ovate, ovate, or obovate.   (8)
8 (7) Peduncle ca. 1 cm; catkin rachis villous.   (9)
+ Peduncle ca. 2 cm or longer; catkin rachis pubescent; leaf apex acuminate.   (10)
9 (8) Catkin ca. 5 cm; leaf apex obtuse or acute   15 Salix dunnii
+ Catkin ca. 3 cm; leaf apex acute to acuminate   16 Salix chingiana
10 (8) Bracts with hairs on proximal and middle parts and along margin; leaf blade elliptic to oblong   11 Salix wilsonii
+ Bracts downy only at base; leaf blade not elliptic to oblong.   (11)
11 (10) Leaf blade lanceolate, elliptic-lanceolate, or oblong, 4-7 cm; stamens (3-)6; glands usually discoid   13 Salix rosthornii
+ Leaf blade oblong-lanceolate, 1.5-3.5 cm; stamens 4; glands not discoid   14 Salix chekiangensis

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