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密花节节菜

原图链接 来自植物标本馆

中文学名:密花节节菜 拉丁学名:Rotala densiflora (Roth) Koehne 界:植物界 门:被子植物门 Angiospermae 纲:双子叶植物纲 Dicotyledoneae 科:千屈菜科 属:节节菜属 种:密花节节菜

密花节节菜(mì huā jié jié cài，学名 Rotala densiflora (Roth) Koehne，异名：Sellowia uliginosa Ammannia densiflora Rotala densiflora subsp. uliginosa )，一年生湿生草本。叶对生，椭圆状长圆形或披针形，花无梗，蒴果半球形，主要分布于我国广东北江，印度、非洲。喜生于水湿地上。

密花节节菜形态特征

一年生草本，基部常伏地；茎高7-10厘米而多分枝，或有时可达20厘米而少分枝。

叶交互对生，无柄，椭圆状矩圆形、披针形或长椭圆形，长约12毫米，大的可达30毫米，生于枝梢或分枝上的长约5毫米，宽1.5-5毫米，顶端钝尖或短尖，基部阔，下面叶脉极不明显。

原图链接 来自植物标本馆

花无梗，单生叶腋，紧接，但不组成穗状花序；小苞片毛状，约与花萼等长；萼筒钟形，结实时半球形，长1-2毫米，裂片5，短齿状，稀3或4，裂片间附属体刚毛状；花瓣5倒卵形或近圆形，与花萼裂片等长或为其长的2倍，有颜色，顶端常微凹；雄蕊5，有时4或3，花柱长度为子房的1/2-2/3倍或过之。

蒴果近球形，3裂。花、果期8月。

Rotala densiflora (Roth) Koehne in Engl., Bot. Jahrb. 1: 164. I880, ibid. 4: 388. 1883 et in Engl. Pflanzenr. 17 (IV-216): 35. f. 3c. 1903; Backer et Bakh. f., Fl. Java 1: 25 3. 1963; Van Leeuwen in Blumes 19: 55-56. 1971. ——Ammannia densiflora Roth in Roem. et Schult., Syst. 3: 304. 1818; DC., Prodr. 3: 79. 1828. ——Sellowia uligznosa Roth op, cit. s: 407. 1819; Roth, Nov. sp. Ind. or. 163. 1821, DC., Prodr. 3: 380. 1828.——Rotala roxburghiana Wight, Icon. t, 2608. 1840, excl. syn. Ammannia pentandra.——Rotala desiflora subsp. uligosa Koehne in Engl., Bot. Jahrb. 1: 165. 1880.

Herbs, annual, terrestrial or amphibious, 7-10[-40] cm. Stem usually creeping, sparsely to densely branched, 4-winged, wings not running into leaves. Leaves decussate, often alternate toward stem apex, narrowly elliptic, linear-lanceolate, oblong, or ovate, [2-]12-30 × 1.5-5 mm, base cordate to obtuse, apex obtuse, acute, or acuminate. Bracts of stem and lower branches like foliage leaves; bracts of axillary branchlets much smaller and broadly ovate, clasping. Flowers solitary in axils on main stem or in axillary spikes; bracteoles pink, lanceolate, equaling to surpassing floral tube. Floral tube (4 or)5-merous, campanulate, 1-2 mm; sepals (3-)5; epicalyx segments present between sepals, setiform, ca. 1/2 as long as to longer than sepals. Petals (4 or)5, bright pink or white, equal to or surpassing sepals, persistent. Stamens (3-)5; anthers reaching margin of floral tube. Ovary globose; style shorter than ovary, slightly exserted. Capsules subglobose, ca. 1.5 mm in diam., included, 3-valved. Seeds ca. 0.5 mm. Fl. and fr. Aug.

密花节节菜生长环境

生长于湿地上。

密花节节菜分布范围

中国仅见于广东北江；分布于印度及非洲等地。