短苞百蕊草查看源代码讨论查看历史
短苞百蕊草 |
中文名:短苞百蕊草 拉丁学名:Thesium brevibracteatum Tam 界:植物界 门:被子植物门 纲:双子叶植物纲 亚 纲:原始花被亚纲 目:檀香目 亚 目:檀香亚目 科:檀香科 族:百蕊草族 属:百蕊草属 组:百蕊草组 |
短苞百蕊草(duǎn bāo bǎi ruǐ cǎo),学名:Thesium brevibracteatum Tam,是檀香科百蕊草属下的一个植物种。分布在内蒙古。模式标本采自锡林郭勒盟。 [1]
短苞百蕊草形态特征
亚灌木状草本,高达30厘米;根茎近圆锥状,长约8厘米,顶端直径约1厘米,黄褐色;茎细长,常直立,部分斜升,坚韧,有纵条沟,横切面呈四棱形。
叶稀疏,线形,长约2.5厘米,顶端短尖,具单脉,无柄,边缘有肉质微刺。总状花序多花;花漏斗状,白色,长8毫米,有时更长;
苞片1枚,狭线形,长5-7毫米;小苞片2枚,钻状,长3毫米左右,均向上弯拱;花梗长5毫米,有细纵纹;花被管圆筒状,长3毫米,花被裂片5,狭长圆形,长4毫米,顶端锐尖,内弯;
雄蕊长2毫米;子房柄长0.8-1毫米,花柱长2.5毫米,内藏。坚果卵圆形,长3-3.5毫米,宽2.5-3毫米,表面约有10条纵脉并有近平行或斜出的支脉,但不呈网状;
宿存花被漏斗状,长约4毫米,比果长;果柄长5-6毫米。花果期8-9月。
Herbs subshrublike; rootstock yellowish brown, ± conic, ca. 8 cm, tip ca. 10 mm thick. Stems usually erect, partly ascending, rigid, slender, to 30 cm, 4-ribbed, furrowed. Leaves sparse, sessile, linear, ca. 25 mm, 1-veined, margin minutely denticulate, apex acute.
Inflorescences racemelike, many flowered; bracts narrowly linear, 5-7 mm; pedicel ca. 5 mm, finely striate; bracteoles 2, subulate, ca. 3 mm, curved. Perianth 5-merous, white, funnelform, ca. 8 mm, sometimes longer, tube tubular, ca. 3 mm, lobes narrowly oblong, ca. 4 mm, apex acute, incurved.
Stamens ca. 2 mm. Ovary stalk 0.8-1 mm. Style 2.5 mm, not exserted. Nutlet ovoid, 3-3.5 × 2.5-3 mm, with 10, nearly parallel or obliquely lateral veins, not reticulate; persistent perianth funnelform, ca. 4 mm, longer than fruit; stalk 5-6 mm. Fl. and fr. Aug-Sep.
短苞百蕊草生长环境
生长于砂丘的向阳处。