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FOC | Family List | FOC Vol. 22 | Poaceae | Bambusa

2. Bambusa subg. Leleba (Rumphius ex Nakai) P. C. Keng ex L. C. Chia & X. L. Feng, Fl. Reipubl. Popularis Sin. 9(1): 75. 1996.

孝顺竹亚属 xiao shun zhu ya shu

Authors: Nianhe Xia, Liang-zhi Jia & Chris Stapleton

Leleba Rumphius ex Nakai, Fl. Sylv. Kor. 20: 13. 1933; Tetragonocalamus Nakai.

Culm internodes mostly shorter than 30 cm; wall to 2 cm thick; branchlets of lower branches never specialized into tough or weak thorns. Branches usually absent toward culm base, usually 3 co-dominant. Culm sheaths thickly papery; auricles large, rounded or irregular, or absent; blade deciduous, broad, base 1/2–3/4 width of sheath apex. Pseudospikelets loose at maturity, with broad florets on short rachilla segments.

More than 35 species:widely distributed in tropical and subtropical Asia; widely planted in other parts of the world; 30 species (22 endemic) in China, mainly in the south, some in the southwest.

Bambusa crispiaurita (species no. 37) could not be included in the following key because the available description is inadequate.

1 Culm sheath auricles to 1 cm or wider, or if less than 1 cm then branches arising from lower nodes (sometimes from basal node), or leaf blade abaxially glabrous and culm internodes 20–30 cm   (2)
+ Culm sheath auricles less than 1 cm wide, or if ca. 1 cm, then culm blade base less than 1/3 width of sheath apex   (14)
2 (1) Culm sheath blade nearly 1/2 width of sheath apex or narrower   (3)
+ Culm sheath blade more than 1/2 width of sheath apex   (5)
3 (2) Culm sheath auricles unequal; sheaths apically asymmetrical broadly arched, with short, stiff hairs near inner margin.   38 B. rigida
+ Culm sheath auricles subequal; sheaths apically convex and undulate, uniformly hairy   (4)
4 (3) Culm sheaths with pale brown or white silky hairs; auricles 2.5–3 cm; ligule 7–8 mm; leaf blade abaxially densely pubescent at least when young.   28 B. polymorpha
+ Culm sheaths with stiff, dark brown hairs; auricles 0.8–1 cm; ligule 3–4 mm; leaf blade abaxially glabrous.   41 B. vulgaris
5 (2) Culm sheath blade joined with auricles for 1–1.3 cm   (6)
+ Culm sheaf blade joined with auricles for 3–7 mm   (9)
6 (5) Culm sheath apically arched, broadly symmetrically triangular; ligule 1.5–2 mm.   30 B. teres
+ Culm sheath apically asymmetrical, arched or truncate; ligule 3–5 mm   (7)
7 (6) Culm sheaths broadly triangular, length less than 1/2 basal width, apex very broadly arched-convex or subtruncate; auricles ± horizontal.   29 B. tulda
+ Culm sheaths triangular, length more than 1/2 basal width, apex asymmetrically arched, convex; larger auricle slanted downward along sheath margin   (8)
8 (7) Culm internodes subsolid; culm sheath blade broadly lanceolate to triangular-ovate, ligule entire, white ciliolate; leaf blade abaxially glaucous.   31 B. burmanica
+ Culm internodes hollow; culm sheath blade triangular to narrowly triangular, ligule dentate, fimbriate; leaf blade abaxially green.   32 B. eutuldoides
9 (5) Culm sheath apically subtruncate; ligule 1.5–2 mm.   36 B. subtruncata
+ Culm sheath apically asymmetrical or broadly arched, sometimes obliquely truncate; ligule 3–5 mm   (10)
10 (9) Culm sheaths ± pubescent   (11)
+ Culm sheaths glabrous   (12)
11 (10) Larger culm sheath auricle slanted downward along sheath margin, gradually tapering.   33 B. pervariabilis
+ Larger culm sheath auricle not slanted downward, not tapering.   40 B. dolichoclada
12 (10) Lower culm internodes without colored stripes.   35 B. tuldoides
+ Lower culm internodes with yellow-green or pale green stripes   (13)
13 (12) Branches arising from basal node up; larger auricle of culm sheath obovate- oblong or oblanceolate, tapering.   33 B. pervariabilis
+ Branches arising from basal 3rd or 4th node up; larger auricle of culm sheath oblong, not tapering.   34 B. longispiculata
14 (1) Leaf blade abaxially pale and glaucous   (15)
+ Leaf blade abaxially green or pale green   (17)
15 (14) Culm sheath auricles very small or inconspicuous.   57 B. multiplex
+ Culm sheath auricles well developed   (16)
16 (15) Culm sheath auricles obviously unequal, usually partially covered by base of blade; sheaths asymmetrical, apex broadly convex.   39 B. boniopsis
+ Culm sheath auricles subequal, not covered by base of blade; sheath apically subtruncate.   46 B. pallida
17 (14) Culm sheath blade base narrower than 1/2 width of sheath apex   (18)
+ Culm sheath blade base wider than 1/2 width of sheath apex   (19)
18 (17) Culm sheath auricles extremely unequal, larger to 3.5 × size of smaller; ligules ca. 1 mm; base of culm sheath blade nearly 3/7 width of sheath apex.   53 B. mollis
+ Culm sheath auricles less unequal, larger to 2 × size of smaller; ligules ca. 2 mm; base of culm sheath blade ca. 1/4 width of sheath apex.   54 B. contracta
19 (17) Culm sheath auricles inconspicuous; sheath apex truncate.   56 B. truncata
+ Culm sheath auricles well developed; sheath apex asymmetrically arched, broadly arched, or shallowly undulate, subtruncate   (20)
20 (19) Culm sheath apically subtruncate, sometimes also extremely broadly arched   (21)
+ Culm sheath apically asymmetrically arched, broadly arched, or shallowly undulate   (23)
21 (20) Culm sheaths stiffly hairy near margins and base; auricles subequal; ligules ca. 1 mm.   47 B. duriuscula
+ Culm sheaths stiffly hairy near base or inner margin but not both; auricles obviously unequal, larger at least 2 × size of smaller; ligules 2–3 mm   (22)
22 (21) Branches usually arising from 1st or 2nd node; culm sheaths pubescent only near base.   43 B. gibboides
+ Branches usually arising from 8th to 10th node; culm sheaths pubescent only near inner margin.   51 B. lenta
23 (20) Culm sheath ligule ca. 5 mm.   42 B. utilis
+ Culm sheath ligule 1–3 mm   (24)
24 (23) Culm sheaths substantially pubescent; ligule 0.6–1 mm   (25)
+ Culm sheaths glabrous or pubescent only near margins; ligule (<1–)1–3 mm   (27)
25 (24) Culm sheaths white pubescent, auricles falcate and cupped.   49 B. amplexicaulis
+ Culm sheaths stiffly brown hairy, auricles not falcate   (26)
26 (25) Culm sheaths densely and uniformly dull brown hairy; auricles not covered by blade   48 B. pachinensis
+ Culm sheaths ± brown hairy; auricles usually partly covered by blade.   50 B. semitecta
27 (24) Culm nodes glabrous; usually branching from 7th to 11th node up.   55 B. textilis
+ Basal culm nodes usually with a ring of gray-white silky hairs above sheath scar; usually branching from 4th to 6th (rarely 7th) node up   (28)
28 (27) Culm sheaths with stiff marginal hairs; ligule 1–1.5 mm.   45 B. albolineata
+ Culm sheaths glabrous; ligule 2–3 mm   (29)
29 (28) Culm sheath auricles never covered by blade base, the larger oblanceolate and tapering   44 B. piscatorum
+ Culm sheath auricles partly covered by blade base, the larger oblong with rounded ends.   52 B. mutabilis

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