|
Culms 0.51(2) m tall, 0.20.4 cm thick; internodes 1017 cm, softly pubescent, green, becoming purple where exposed, apically waxy; nodes prominent. Branches 1 per node in the first year, 1 or 2 more in the second year, proximal nodes budless, lateral branching from more distal nodes. Culm sheaths persistent, shorter than the internode, very shortly tomentose when young, apically waxy at first; margins ciliate; auricles distally absent to proximally small and rounded; oral setae 25 each side, deciduous, distally erect, proximally spreading, 28 mm, white, glabrous; ligule very short, inconspicuous. Leaf sheaths tomentose, external margin ciliate; auricles very small or absent; oral setae 05 each side, erect or spreading, 310 mm, glabrous; ligule very short, to 0.5 mm, inconspicuous; blade 1015 cm long, 1.22.2 cm wide, all green or initially bright yellow, or bright yellow with green stripes, becoming more uniform light and dark green, lower surface densely shortly tomentose, upper surface more sparsely so; margins scabrous.
Name from Latin viridis, green and striatus, striped, as the leaf blades on the first cultivar encountered have such broad yellow stripes that they effectively have green stripes on a yellow background.
As in many bamboos the presence of auricles and oral setae on culm sheaths and leaf sheaths varies substantially. At the end of a shoot (distally) they may be absent or small and erect, while at the base (proximally) they are often quite strongly developed and spreading outwards much more.
Pleioblastus viridistriatus is native to Japan, where it has been grown widely for centuries, and it is now cultivated in many parts of the world. The best-known cultivar has leaf blades with broad yellow stripes on its leaf blades in spring. A larger, wild, very similar, all-green bamboo was later described as Pleioblastus kongosanensis. It is considered synonymous, but the epithet viridistriatus was published first, so it must be used, even for plants with no stripes. Cultivar Chrysophyllus has almost completely yellow leaf blades at first.
For highly technical reasons the names Arundinaria auricoma and Pleioblastus viridistriatus could not theoretically be used, and authorities in the UK started to use Arundinaria auricoma instead. However Pleioblastus viridistriatus was being used so widely in all other countries of the world that a proposal requesting the use of this name was made (Stapleton & Renvoize, 2001) and this was officially sanctioned in 2004.
|
)
)
)
)
)
 "leaf blade lower surface")
 "leaf blade upper surface")
)
