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

6. Salix Sect. Salix

柳组 liu zu

Sect. Albae A. Kerner; sect. Fragiles Koch; sect. Subalba Koidzumi; sect. Subfragiles (Seemen) Nakai.

Trees, rarely shrubs; bark furrowed. Branchlets erect or slightly pendulous, rarely fully pendulous, slender. Leaves mostly lanceolate, abaxially slightly pubescent or glaucescent, margin serrulate, rarely entire, apex acuminate or long acuminate. Flowering coetaneous or slightly precocious. Bracts yellowish, rarely brown. Male flower: glands adaxial and abaxial, stamens 2. Female flower: glands 1 or 2; ovary glabrous or pilose, sessile or shortly stipitate.


Key based on female plants

1 Branchlets pendulous.   (2)
+ Branchlets erect or spreading, not pendulous (except sometimes in S. matsudana).   (3)
       
2 (1) Ovary glabrous or slightly pilose at base; bracts lanceolate   36 Salix babylonica
+ Ovary downy proximally; bracts ovate   37 Salix pseudolasiogyne
       
3 (1) Ovary pilose.   (4)
+ Ovary glabrous or pilose at base.   (11)
       
4 (3) Female flower with adaxial and abaxial glands.   (5)
+ Female flower with adaxial gland only.   (7)
       
5 (4) Branchlets yellowish gray or yellowish brown   40 Salix eriocarpa
+ Branchlets grayish brown, brown, or grayish chestnut colored.   (6)
       
6 (5) Catkin subsessile; style slightly shorter than ovary; bracts ovate-oblong or ovate, apex acute or obtuse   41 Salix koreensis
+ Catkin pedunculate; style much shorter than ovary; bracts subrectangular, apex glandular dentate   42 Salix qinghaiensis
       
7 (4) Flowering catkin 2-3 mm thick   44 Salix sphaeronymphe
+ Flowering catkin less than 3 mm thick.   (8)
       
8 (7) Bracts obovate or obovate-orbicular; ovary broadly ovoid or subglobose   46 Salix pierotii
+ Bracts long ovate or oblong; ovary conical, cylindric-ovoid, ovoid, or narrowly ovoid.   (9)
       
9 (8) Catkin 2-2.5 cm; peduncle 0.8-1.5 cm   45 Salix sericocarpa
+ Catkin 1.5-2 cm; peduncle less than 0.8 cm.   (10)
       
10 (9) Style 2-lobed; bracts long ovate, adaxially ciliate and with long hairs, abaxially with long hairs proximally   47 Salix longistamina
+ Style shallowly 2-lobed; bracts oblong, adaxially glabrous, abaxially with long hairs at base and margin   43 Salix bangongensis
       
11 (3) Young branchlets tomentose; young leaves silvery sericeous.   (12)
+ Young branchlets and leaves subglabrous or pilose, neither tomentose nor silvery sericeous.   (13)
       
12 (11) Catkin 3-4.5 cm, to 5.5 cm in fruit; ovary ovoid-conical, 4.5-5 mm; bracts lanceolate or ovate-lanceolate, both surfaces sericeous   27 Salix alba
+ Catkin 1.2-1.8 cm, to 4 cm in fruit; ovary ovoid, ca. 2 mm; bracts ovate, both surfaces glabrous, ciliate   35 Salix chienii
       
13 (11) Glands adaxial and abaxial.   (14)
+ Gland adaxial only (rarely abaxial gland also present).   (17)
       
14 (13) Ovary pilose at base   31 Salix weixiensis
+ Ovary glabrous.   (15)
       
15 (14) Catkin ca. 2 cm, less than 2.5 cm in fruit; bracts ovate, apex obtuse   32 Salix matsudana
+ Catkin (2.5-)3-4 cm; bracts deltoid-lanceolate, apex acute.   (16)
       
16 (15) Bracts adaxially with dense hairs, abaxially subglabrous   29 Salix chikungensis
+ Bracts downy on both surfaces   30 Salix jishiensis
       
17 (13) Gland very large and broad, nearly surrounding base of ovary   33 Salix pingliensis
+ Gland not large and broad.   (18)
       
18 (17) Peduncle with 2 or 3 normal leaflets; ovary pilose at base; bracts ovate-orbicular   34 Salix sphaeronymphoides
+ Peduncle without normal leaflets; ovary glabrous; bracts ovate to oblong.   (19)
       
19 (18) Peduncle 7-9 mm; bracts with long, yellow hairs on both surfaces; gland large and broad, usually sharply lobed   39 Salix bikouensis
+ Peduncle less than 5 mm; bracts without long, yellow hairs; gland narrow, apex entire.   (20)
       
20 (19) Ovary with stipe extremely short; style short but conspicuous, 2-lobed; catkin 0.8-1.2 cm   26 Salix heteromera
+ Ovary sessile; style short, entire at apex; catkin 1.5-1.8 cm   38 Salix capitata

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