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