(34) 長柱茅膏菜
Drosera oblanceolata Y. Z.Ruan
茅膏菜科(Droseraceae)
中國境內現狀:易危(VU)
Status in China: Vulnerable(VU)
形態特徵:多年生草本。莖短,不分枝,無球莖。葉蓮座狀排列,圓形,倒被針形至線形,長0.5-1.2厘米,寬0.2-0.4厘米,被柔毛狀腺毛;托葉膜質,淡紅色,長約5毫米,3深裂至基部,居中一裂片特大,頂部2-3裂;葉柄扁平,長l-3.2厘米,被腺毛或無毛。花序1-2條,長5-9厘米,具花8-10朵;苞片線形,長約2毫米;花柄長3-5毫米;萼片5,狹倒卵形或長圓形,長約4毫米,基部合生,頂部具疏腺齒,宿存;花瓣5,倒卵形或楔形,粉紅色;雄蕊5;
子房橢圓形或球形,長約2毫米;花柱3,長2-3毫米。蒴果,果爿3;種子橢圓形,長約0.8毫米。
地理分布:大東山。廣東、廣西。
生境與生態:生於石旁等潮濕、向陽處。花果期:5-10月。
本種為食蟲植物,在生態系統中有其獨特的作用。種群小,易受生境破壞影響。在香港其生長地點位於郊野公園而受到保護。
Description: Perennial herbs, without tubers
below the ground. Stems short, not branched. Leaves rosette, orbicular to oblanceolate
or linear, 0.5-1.2 cm long, 2-4 mm wide, with glandular hairs; stipule membranous,
light red, 5 mm, deeply 3-parted, middle lobe larger, 2- or 3-lobed at apex;
petiole flattened, 1-3.2 cm long, glandular or glabrous. Inflorescences 1 or
2, 5-9 cm long, 8-10-flowered; bracts linear, ca. 2 mm long; pedicels 3-5 mm
long; sepals 5, narrowly obovate to oblong, ca. 4 mm long, united at base, glandular-toothed
at apex, persistent; petals 5, obovate to cuneate, pink; stamens 5; ovary ellipsoid
to globose, ca. 2 mm long; styles 3, 2-3 mm long. Capsule 3-valved. Seeds ellipsoid,
ca. 0.8 mm long.
Distribution: Sunset Peak. Guangxi, Guangdong.
Habitat and ecology: On wet and sunny places
beside rocks. Flowering & fruiting: May-Jul.
It is an insectivorous plant and plays a special role in an ecosystem. Natural populations are small and susceptible to disturbance and habitat destruction. In Hong Kong, the locality of its occurrence is in Country Park under protection.
參考文獻(References):
阮雲珍,1991:廣東植物誌2:65。廣東科技出版社,廣州。