多孔茨藻Najas foveolata A. Br. ex Magnus
多孔茨藻Najas foveolata A. Br. ex Magnus
8. 多孔茨藻（华东水生维管束植物）图版51
Najas foveolata A. Br. ex Magnus, Beitr. 7. 1870; Rendle in Trans. Linn. Soc. Lond. Bot. 5: 416. 1899, et in Engl. Pflanzenr. 7 (IV 12): 15. 1901. ——N. indica auct. non (Willd.) Cham.: de Wilde in Steen. Fl. Males. 6 (2): 166. 1962. pro parte.
一年生沉水草本。植株纤细，质脆，呈黄绿色，有时节间基部呈紫红色，下部匍匐，节上生有不定根，上部直立；株高10-20厘米。茎圆柱形，无刺，直径0.5-1毫米，节间长0.5-0.8厘米；分枝多，呈二叉状。叶线形，多为3叶假轮生，于枝端较密集，无柄；叶片线形，柔弱而伸展，长2-2.5厘米，宽0.2-0.5毫米，先端有1-2枚具黄褐色刺细胞的细齿，边缘每侧具6-24枚细锯齿，齿长约为叶宽的1/10，齿端具1黄褐色刺细胞，叶背面沿脉无刺；叶表皮细胞为纵向的长方形，叶基扩展成鞘，抱茎，褐色，长2-2.5毫米，倒心形；叶耳内侧无齿，先端至外侧具细锯齿4-9枚，齿端为1黄褐色刺细胞。花单性，单生于叶腋；雄花椭圆形，浅黄绿色，长约1毫米，多生于植株上部，具1短颈瓶状佛焰苞和1花被；雄蕊1枚，花药4室；花粉拉圆形至椭圆形；雌花裸露，无花被，椭圆形；雌蕊1枚，长约2.5毫米；花柱长1毫米，柱头2裂，不等长，宿存。瘦果黄色，长椭圆形，长约1.5毫米，直径约0.5毫米。种子长椭圆形；外种皮细胞近四边形至多边形，约20列。花果期8-9月。2n=12。
产广西（北海）。生于水坑和池塘中。也分布于马来西亚、印度等地。
《Flora of China》 Vol. 23 (2010)
Najas foveolata A. Braun ex Magnus Beitr. Kenntn. Najas. 7. 1870.
多孔茨藻 duo kong ci zao
Caulinia foveolata (A. Braun ex Magnus) Nakai.
Stems 10-20 cm tall, 0.5-1 mm in diam. Leaves linear, slender, 2-2.5 cm × 0.2-0.5 mm; sheath 2-2.5 mm; auricles obcordate, minutely serrulate with 4-9 teeth at apex and outer side; leaf margin on each side minutely serrulate with 6-24 teeth. Plants monoecious; flowers solitary, male flowers in upper axils and female flowers throughout. Male flowers elliptic, ca. 1 mm; spathe with a short neck, with several brownish spine cells at apex; anther 4-thecous. Female flowers ca. 2.5 mm; style ca. 1 mm; stigmas 2-lobed, unequal. Fruit narrowly ellipsoid, ca. 1.5 × 0.5 mm. Seeds narrowly ellipsoid, with ca. 20 rows of pits; areoles subsquarish to polygonal. Fl. and fr. Aug-Sep. 2n = 12*, 24, 36.
Ponds. Anhui, Guangxi, Hubei, Taiwan, Zhejiang [India, ?Indonesia, Malaysia].
Previously, this species was known only in China from S Guangxi.Previously, this species was known only in China from S Guangxi.
科名：茨藻科 Najadaceae
属名：茨藻属 Najas
8. 多孔茨藻（华东水生维管束植物）图版51
Najas foveolata A. Br. ex Magnus, Beitr. 7. 1870; Rendle in Trans. Linn. Soc. Lond. Bot. 5: 416. 1899, et in Engl. Pflanzenr. 7 (IV 12): 15. 1901. ——N. indica auct. non (Willd.) Cham.: de Wilde in Steen. Fl. Males. 6 (2): 166. 1962. pro parte.
一年生沉水草本。植株纤细，质脆，呈黄绿色，有时节间基部呈紫红色，下部匍匐，节上生有不定根，上部直立；株高10-20厘米。茎圆柱形，无刺，直径0.5-1毫米，节间长0.5-0.8厘米；分枝多，呈二叉状。叶线形，多为3叶假轮生，于枝端较密集，无柄；叶片线形，柔弱而伸展，长2-2.5厘米，宽0.2-0.5毫米，先端有1-2枚具黄褐色刺细胞的细齿，边缘每侧具6-24枚细锯齿，齿长约为叶宽的1/10，齿端具1黄褐色刺细胞，叶背面沿脉无刺；叶表皮细胞为纵向的长方形，叶基扩展成鞘，抱茎，褐色，长2-2.5毫米，倒心形；叶耳内侧无齿，先端至外侧具细锯齿4-9枚，齿端为1黄褐色刺细胞。花单性，单生于叶腋；雄花椭圆形，浅黄绿色，长约1毫米，多生于植株上部，具1短颈瓶状佛焰苞和1花被；雄蕊1枚，花药4室；花粉拉圆形至椭圆形；雌花裸露，无花被，椭圆形；雌蕊1枚，长约2.5毫米；花柱长1毫米，柱头2裂，不等长，宿存。瘦果黄色，长椭圆形，长约1.5毫米，直径约0.5毫米。种子长椭圆形；外种皮细胞近四边形至多边形，约20列。花果期8-9月。2n=12。
产广西（北海）。生于水坑和池塘中。也分布于马来西亚、印度等地。
《Flora of China》 Vol. 23 (2010)
Najas foveolata A. Braun ex Magnus Beitr. Kenntn. Najas. 7. 1870.
多孔茨藻 duo kong ci zao
Caulinia foveolata (A. Braun ex Magnus) Nakai.
Stems 10-20 cm tall, 0.5-1 mm in diam. Leaves linear, slender, 2-2.5 cm × 0.2-0.5 mm; sheath 2-2.5 mm; auricles obcordate, minutely serrulate with 4-9 teeth at apex and outer side; leaf margin on each side minutely serrulate with 6-24 teeth. Plants monoecious; flowers solitary, male flowers in upper axils and female flowers throughout. Male flowers elliptic, ca. 1 mm; spathe with a short neck, with several brownish spine cells at apex; anther 4-thecous. Female flowers ca. 2.5 mm; style ca. 1 mm; stigmas 2-lobed, unequal. Fruit narrowly ellipsoid, ca. 1.5 × 0.5 mm. Seeds narrowly ellipsoid, with ca. 20 rows of pits; areoles subsquarish to polygonal. Fl. and fr. Aug-Sep. 2n = 12*, 24, 36.
Ponds. Anhui, Guangxi, Hubei, Taiwan, Zhejiang [India, ?Indonesia, Malaysia].
Previously, this species was known only in China from S Guangxi.Previously, this species was known only in China from S Guangxi.