|
|
|
20. Acidosasa C. D. Chu & C. S. Chao ex P. C. Keng, J. Bamboo Res. 1(2): 31. 1982.
酸竹属 suan zhu shu
Authors: Zheng-de Zhu, Guangyao Yang & Chris Stapleton
Metasasa W. T. Lin.
Shrubby to arborescent bamboos. Rhizomes leptomorph, with running underground stems. Culms diffuse, erect; internodes terete, weakly grooved basally above branches, cavity with spongy pith; nodes weakly prominent. Branch complement 3 at mid-culm nodes, 3–5 at distal nodes. Culm sheaths deciduous, sparsely setose; auricles small or absent, with or without oral setae; blade lanceolate or triangular. Leaves usually medium-sized; auricles small or absent; blade with many secondary veins, transverse veins distinct. Inflorescence ebracteate, semelauctant, a terminal raceme or racemose panicle. Spikelets robust, several to many flowered, long pedicellate. Glumes 2–4; lemma large, many veined, apex acuminate or shortly mucronate. Palea usually shorter than lemma, 2-keeled, veined between keels. Lodicules 3, membranous, usually transparent at margin. Stamens 6; filaments free; anthers yellow. Ovary appendage inconspicuous; style 1; stigmas 3, plumose. New shoots spring–early summer, fl. summer–autumn.
About 11 species: China, Vietnam; ten species (all endemic) in China.
The generic name Acidosasa and its type, A. chinensis, were previously published by Chu and Chao (J. Nanjing Technol. Coll. Forest Prod. 1979(1–2): 142–143. 1979), but not validly so (see Li, Taxon 46: 105–107. 1997).
|
Key to fertile material
|
|
|
| 1 |
Lemma glabrous |
|
(2) |
| + |
Lemma abaxially hairy or with tessellate venation |
|
(5) |
| |
|
|
|
| 2 (1) |
Lemma not powdery |
|
(3) |
| + |
Lemma powdery |
|
(4) |
| |
|
|
|
| 3 (2) |
Lemma slightly tessellate, not glossy, veins 21–24; palea 1.4–1.6 cm. |
|
1 A. breviclavata |
| + |
Lemma glossy, veins 17–19; palea ca. 1.2 cm. |
|
4 A. chinensis |
| |
|
|
|
| 4 (2) |
Spikelets short, 1.5–7.5 cm; lemma weakly glaucous, 9–13-veined; palea keels hairy. |
|
9 A. chienouensis |
| + |
Spikelets long, ca. 11 cm; lemma farinose, 9–11-veined; palea keels ciliate. |
|
6 A. lingchuanensis |
| |
|
|
|
| 5 (1) |
Lemma glabrous, venation tessellate; stigmas flagellate. |
|
10 A. edulis |
| + |
Lemma pubescent; stigmas not flagellate |
|
(6) |
| |
|
|
|
| 6 (5) |
Lemma densely pubescent; palea ciliolate |
|
(7) |
| + |
Lemma sparsely pubescent; palea pubescent or sparsely setose |
|
(9) |
| |
|
|
|
| 7 (6) |
Spikelets 6–8 in a panicle, subtended by a lanceolate bractlet. |
|
3 A. nanunica |
| + |
Spikelets 1–6 in a raceme, not subtended by a bractlet |
|
(8) |
| |
|
|
|
| 8 (7) |
Spikelets 4–9 cm; florets 3–15. |
|
2 A. purpurea |
| + |
Spikelets 6–17 cm; florets 13–33. |
|
7 A. guangxiensis |
| |
|
|
|
| 9 (6) |
Spikelets robust, 4–6 mm wide; lemma 1.4–1.9 cm, pedicel 2–13 mm. |
|
8 A. notata |
| + |
Spikelets slender, 3–4 mm wide; lemma ca. 1.3 cm |
|
(10) |
| |
|
|
|
| 10 (9) |
Pedicel 0.5–1 cm, glabrous, shorter than lemma; palea shorter than lemma; lemma glaucous. |
|
9 A. chienouensis |
| + |
Pedicel 1–3 cm, slightly hairy; longer than lemma; palea about as long as lemma or sometimes slightly longer; lemma not glaucous. |
|
5 A. venusta |
|
|
List of Keys
|
List of lower taxa
| Related Links (opens in a new window) |
|
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|
|
|
