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25. Oligostachyum Z. P. Wang & G. H. Ye, J. Nanjing Univ., Nat. Sci. Ed. 1982(1): 95. 1982 [“Oligostacyum”].

少穗竹属 shao sui zhu shu

Authors: Zheng-ping Wang & Chris Stapleton

Clavinodum T. H. Wen.

Shrubby to arborescent bamboos. Rhizomes leptomorph, with running underground stems. Culms diffuse, sometimes clustering; internodes not terete, flattened above branches; nodes ± elevated; intranode (3–)5 mm. Culm sheaths caducous or tardily deciduous, rarely persistent, leathery or papery; auricles and oral setae absent or sometimes weakly developed; blade spreading or reflexed, sometimes erect. Branches 3(–7) at each node in midculm, spreading. Leaf auricles and oral setae absent or weakly developed; blade small, transverse veins distinct. Inflorescence a raceme with 2 or 3(–6) spikelets, rarely a panicle with many spikelets, peduncle, axis, branches, and pedicels slender, glabrous, scabrous or pubescent along longitudinal angles, branches usually subtended by a scaly bract at base. Spikelets ± compressed at maturity, several to many florets; rachilla disarticulating below fertile florets, extended beyond palea of uppermost floret, internodes flattened or concave on side facing floret. Glumes (1–)3(–5), transitional with basal, sterile lemmas; lemma 7- to many veined, abaxially commonly puberulent and with distinct tessellation, adaxially slightly scabrous with minute setulae, apex acuminate with an awnlike point; palea conspicuously smaller than lemma or equaling in length but much narrower in upper florets, abaxially minutely setulate, 2-keeled, 2–4-veined between and beside keels, apex obtuse or emarginate; lodicules 3, membranous with thickened lower portion, 5–7-veined, margins ciliate, anterior pair of lodicules usually asymmetrical. Stamens 3 or 4(or 5). Ovary glabrous; style 1; stigmas (2 or)3, plumose.

* At least 15 species:China.

Oligostachyum is similar to Acidosasa, from which it differs in having florets with no more than 5 stamens.

Taxa incertae sedis

Oligostachyum exauriculatum N. X. Zhao & Z. Yu Li in Z. Yu Li, Pl. Longqi Mountain, Fujian, China, 599. 1994.

无耳少穗竹 wu er shao sui zhu

Culms 3–4 m, (0.7–)1.2 cm in diam.; internodes initially dark green, white powdery, subcylindric, mostly 20–28 cm, shorter toward base, glabrous; nodes distinctly elevated; intranodes ca. 5 cm; branches mostly 3 per node, 5 or more at upper nodes. Culm sheaths deciduous, hardly spotted, thickly papery, abaxially sparsely reddish brown setulose; auricles and oral setae absent; blade erect, yellowish brown, triangular, 0.4–1.5 cm, base not narrowed. Leaves 2 or 3 per ultimate branch; sheath sparsely caducous ciliate; auricles and oral setae absent; ligule arcuate, 2–3 mm, margin subglabrous; blade linear-lanceolate, 10–18 × 1–1.5 cm, both surfaces subglabrous, base broadly cuneate, apex acuminate; lateral veins transverse, 4- or 5-paired. Inflorescence unknown.

● Montane forest margins; 1900–2000 m. Fujian (Jiangle).

The authors compared this species to Oligostachyum oedogonatum.

In addition, Oligostachyum yonganense Y. M. Lin & Q. F. Zheng (Fl. Fujian. 6: 689. 1995) was described from Fujian (Yongan). In the protologue it was compared with O. lanceolatum.

1 Culm internodes obclavate, lower ones gradually thickened downward; midculm branches 3–7 per node, subequal in diam.   1 O. oedogonatum
+ Culm internodes of culm cylindrical, not thickened, midculm branches 3 per node, or if more than 3, then conspicuously unequal in diam   (2)
2 (1) Culm internodes pitted (like pigskin) below nodes; fertile lemma 15- or 16-veined.   15 O. puberulum
+ Culm internodes not pitted; fertile lemma where known 7–15-veined   (3)
3 (2) Culm sheaths dark brown or straw-colored with gray-black upper margins when dry; leaf sheath ligule more than 2 mm   (4)
+ Culm sheaths uniformly straw-colored when dry; leaf sheath ligule less than 2 mm   (6)
4 (3) Culm sheath apically rounded; blade lanceolate or narrowly lanceolate, base tapered.   2 O. lanceolatum
+ Culm sheath apically triangular; blade triangular, triangular-lanceolate, or linear-lanceolate, base not or only weakly tapered   (5)
5 (4) Culm sheath blade deciduous, both surfaces pubescent toward base; culm sheath ligule glabrous or white ciliolate.   3 O. hupehense
+ Culm sheath blade persistent, both surfaces glabrous or hirtellous; culm sheath ligule long brown ciliate.   4 O. spongiosum
6 (3) Basal culm sheaths with longitudinal spots or streaks.   5 O. scabriflorum
+ Culm sheaths without spots   (7)
7 (6) Culm sheath blade narrow, narrowly linear or linear-lanceolate; culm sheath auricles absent   (8)
+ Culm sheath blade broad, lanceolate, triangular-lanceolate, or linear-lanceolate; culm sheath auricles present or absent   (11)
8 (7) Leaf blade usually more than 1.2 cm wide, length less than 10 × width.   11 O. gracilipes
+ Leaf blade less than 1.2 cm wide, or rarely broader, length ca. 14 × width or more   (9)
9 (8) Leaf sheath ligule to 1.5 mm, prominently exserted; culm sheaths glabrous.   14 O. paniculatum
+ Leaf sheath ligule short, not or slightly exserted, culm sheaths strigose   (10)
10 (9) Culm sheath apically 2-lobed; culms ca. 0.8 cm in diam., internodes 8–12 cm.   12 O. bilobum
+ Culm sheath apically truncate; culms 2–3 cm in diam., internodes ca. 25 cm.   13 O. nuspiculum
11 (7) Leaf blade linear or linear-lanceolate; culm sheaths glabrous.   14 O. paniculatum
+ Leaf blade lanceolate or elliptic-lanceolate, rarely linear-lanceolate; culm sheaths hairy   (12)
12 (11) Culm sheaths centrally glabrous   (13)
+ Culm sheaths uniformly setose or strigose   (14)
13 (12) Culm sheaths pubescent at base only; culm sheath and leaf sheath auricles usually present, oral setae developed; culm sheath blade glabrous on both surfaces.   6 O. glabrescens
+ Culm sheaths hairy basally, along both sides, and apically; auricles absent, oral setae not developed, culm sheath blade hirtellous on both surfaces.   7 O. scopulum
14 (12) Culm sheaths without auricles and oral setae, uniformly thickly white powdery.   8 O. sulcatum
+ Culm sheaths with small auricles and developed oral setae, without powder or powdery only below nodes when young   (15)
15 (14) Culm internodes setulose, white powdery below nodes and gray-green with minute, purple speckles when young.   9 O. shiuyingianum
+ Culm internodes glabrous, not white powdery, uniformly green when young.   10 O. lubricum

  • List of lower taxa


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