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FOC | Family List | FOC Vol. 22 | Poaceae

6. Bonia Balansa, J. Bot. (Morot). 4: 29. 1890.

单枝竹属 dan zhi zhu shu

Authors: Nianhe Xia & Chris Stapleton

Monocladus L. C. Chia et al.

Clump-forming scrambling bamboos, small to medium sized. Rhizomes short necked, pachymorph. Culms solid or nearly so; nodes slightly prominent. Branches solitary, nearly as thick as culms. Culm sheaths persistent, leathery; auricles subfalcate to broadly falcate, large; ligule short; blade erect. Leaf blade lanceolate to linear-lanceolate, usually large, base truncate; venation not tessellate. Inflorescence iterauctant, fully bracteate, arising from axil of persistent spathiform bracts; prophylls 2-keeled, gemmiferous, inserted at point of branching, closely followed by 2 or 3 closely spaced, gemmiferous bracts. Pseudospikelets 3–9-flowered, uppermost floret imperfect; first fertile lemma separated from gemmiferous bracts by rachilla segment to 1 cm. Rachilla disarticulating between florets, internodes to 1 cm. Lemma subleathery; palea of lowest floret slightly longer than lemma, subleathery; palea of other florets much shorter than lemma, membranous; lodicules 3, glabrous. Stamens 6; filaments free. Ovary glabrous; style very short; stigmas 3, plumose. Caryopsis terete, glabrous.

Five species: S China, Vietnam; four species (all endemic) in China.

1 Culm sheath auricles inconspicuous.   4 B. parvifloscula
+ Culm sheath auricles well developed   (2)
2 (1) Ligules of culm sheath and leaf sheath long ciliate.   1 B. saxatilis
+ Ligules of culm sheath and leaf sheath entire   (3)
3 (2) Culm sheath blade obliquely cordate, amplexicaul; leaf blade abaxially glaucous, pubescent; culm internodes white powdery, sparsely brown strigose.   3 B. amplexicaulis
+ Culm sheath blade nearly rounded, not amplexicaul; leaf blade abaxially pale green, glabrous; culm not white powdery, glabrous.   2 B. levigata

Lower Taxa


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