白雲百蕊草

白雲百蕊草
來自植物智的圖片

中文名:白雲百蕊草拉丁學名:Thesium psilotoides Hance 界:植物界門:被子植物門綱:雙子葉植物綱亞綱:原始花被亞綱目:管花目科:檀香科屬:百蕊草屬

白雲百蕊草(bái yún bǎi ruǐ cǎo)，學名：Thesium psilotoides Hance，是檀香科百蕊草屬植物，產於廣東廣州市至陽江縣一帶。柬埔寨、泰國、菲律賓、印度尼西亞也有分布，生於海拔200-1300米開曠松林下的草地上。 ^[1]

白雲百蕊草形態特徵

矮小草本，高15-25厘米；根莖短，木質。莖直立，纖細，中部分枝，枝開叉。葉小，鱗片狀，長1-1.5毫米，具單脈，沿莖部下延而成縱棱。

花單生或2-3朵聚生，長1.5毫米，頂生；苞片1枚，小苞片4枚，同形，均比花被短並環繞花被基部；花被長約1毫米，略帶污黃色，5裂至中部；

裂片三角形，在芽中呈鑷合狀排列，邊緣內折；雄蕊5，着生於花冠裂片下部1/3處，花葯2室，內向，花絲短；子房1室；

花柱直立，稍比雄蕊短，柱頭扁圓形。堅果卵圓形，長和寬均約2毫米，向基部漸狹，表面有縱棱和不明顯的網脈；宿存花被短，拱、貼，稍呈臍狀突起。花期5月，果期8月。

Herbs dwarf; rhizomes short, woody. Stems erect, branched at middle (branches rebranched), slender, 15-25 cm. Leaves sessile, scale-like, 1-1.5 mm, decurrent along stems to form ridges, 1-veined. Inflorescences cymose, fasciculate, 1-3-flowered; bracts scale-like, ca. 1.5 mm; bracteoles 4, scale-like, shorter than perianth, bracts and bracteoles forming an involucre around base of perianth.

Perianth 5-merous, slightly dirty yellow, broadly campanulate, ca. 1.5 mm, tube divided to middle, ca. 1 mm, lobes triangular, margin inflexed. Stamens 5, on basal 1/3 of lobes; filaments short. Ovary sessile.

Style erect, slightly shorter than stamens; stigma ± globose. Nutlet ovoid, ca. 2 × 2 mm, with ridges and inconspicuous reticulate veins, gradually narrowed to base; persistent perianth arched, adnate, slightly umbulate, short. Fl. May, fr. Aug.

Open grasslands under Pinus forests; 200-1300 m. Guangdong, [Cambodia, Indonesia, Philippines, Thailand].

分類文獻

Thesium psilotoides Hance in Journ. Bot. 6: 48. 1868; Forb. et Hemsl. in Journ. Linn. Soc. Bot 26: 409. 1894; Lecomte Fl Gen. Indo-chine 5:214. 1915; 廣州植物志413. 1956.