(94) 光笹竹
Sasa subglabra McClure
禾本科(Poaceae)

英文名 (English name): Subglabrous Cane

中國境內現狀：極危 (CR)
Status in China: Critically Endangered (CR)

形態特徵: 根狀莖細長型。稈複叢生，直立，高1.5-2米，直徑5-6毫米。節間圓柱形，長15-20厘米，光滑無毛。分枝於各稈節上常為單枝。稈籜宿存；籜鞘緊包稈部，幼時背面被微毛，後變無毛，先端近截形，邊緣密生纖毛。籜耳缺；籜舌高1-1.5毫米，先端近圓形；籜片直立，披針形，幼時兩面均被短硬毛。葉鞘初被微毛；葉耳缺；葉舌高1-1.5毫米。葉片卵狀披針形至長圓狀披針形，長12-30厘米，寬2.5-5.5厘米，背面近基部被短柔毛，小橫脈明顯。

地理分布：香港特有種，僅見於火炭。

生境與生態：生於林下。

本種為香港特有，1938年首次在沙田村發現。至今尚未採到花序標本，其確切的系統位置尚不清楚，《中國植物誌》作為存疑種處理, 具有科學研究價值。本種的生長地點靠近村邊，易遭受破壞。漁護署已進行遷地保護並進行試驗育苗及人工繁殖。

Description: Shrubby running bamboos; culms erect, 1.5-2 m tall, 5-6 mm in diameter; internodes terete, 15-20 cm long, smooth and glabrous. Branches usually solitary at each node. Culm leaves persistent; sheaths tightly culm-clasping, minute hairy abaxially when young, glabrescent, subtruncate at apex, margin densely ciliate; auricles lacking; ligules 1-1.5 mm high; blades erect, lanceolate, hispidulous on both surfaces when young. Foliage leaves: sheaths puberulous when young; auricles lacking; ligules 1-1.5 mm high; blades ovate-lanceolate to oblong-lanceolate, 12-30 cm long, 2.5-5.5 cm wide, shortly pubescent toward base beneath, reticulate veinlets conspicuous.

Distribution: The species is endemic to Hong Kong and only one small population exists in Fo Tan.

Habitat and ecology: In forests.

Discovered in 1938 from Sha Tin Tsuen in ravines on moist clay, this species is endemic to Hong Kong; but up till now, no flowering specimen is available, therefore its systematic position is still unclear and is thus of special botanical interest. The locality of its occurrence is very close to a village, so it is susceptible to human activities. AFCD had conducted ex-situ conservation and has been trying to propagate it artificially.

參考文獻(References)
McClure, F.A., 1940: Lingnan University Science Bulletin, No. 9: 24.
胡成華，1996：中國植物誌 9：674-675。科學出版社，北京。