中文名（Chinese Name）：鸭跖草
学名（Scientific Name）：Commelina communis L.
英文名（English Common Name）：Asiatic dayflower
别名（Chinese Common Name）：兰花草
异名（Synonym）：Commelina coreana H. Lév. et Vaniot  Commelina ludens Miq.  Commelina communis var. angustifolia Nakai
科属（Family & Genus）：鸭跖草科（Commelinaceae）鸭跖草属
形态特征（Description）：一年生披散草本。茎匍匐生根，多分枝，长可达1米，下部无毛，上部被短毛。叶披针形至卵状披针形，长3-9厘米，宽1.5-2厘米。总苞片佛焰苞状，有1.5-4厘米的柄，与叶对生，折叠状，展开后为心形，顶端短急尖，基部心形，长1.2-2.5厘米，边缘常有硬毛；聚伞花序，下面一枝仅有花1朵，具长8毫米的梗，不孕；上面一枝具花3-4朵，具短梗，几乎不伸出佛焰苞。花梗花期长仅3毫米，果期弯曲，长不过6毫米；萼片膜质，长约5毫米，内面2枚常靠近或合生；花瓣深蓝色；内面2枚具爪，长近1厘米。蒴果椭圆形，长5-7毫米，2室，2爿裂，有种子4颗。种子长2-3毫米，棕黄色，一端平截、腹面平，有不规则窝孔。
分布（Distribution）：产云南、四川、甘肃以东的南北各省区，常生于湿地。越南、朝鲜、日本、俄罗斯及北美也有。
用途（Use）：
引自中国植物志英文版FOC Vol. 24 Page 36
Commelina communis Linnaeus, Sp. Pl. 1: 40. 1753.
鸭跖草 ya zhi cao| Commelinaceae  | Commelina
Commelina coreana H. Léveillé & Vaniot.
Herbs annual. Stems creeping, diffuse, numerous branched, to more than 1 m, glabrous proximally, puberulent distally. Leaf sheaths glabrous; leaf blade lanceolate to ovate-lanceolate, 3--9 × 1.5--2 cm, glabrous. Involucral bracts borne opposite leaves, with 1.5--4 cm long stalk, cordate, folded, 1.2--2.5 cm, often hirsute-ciliate, apex acute. Proximal branch of cincinni with peduncle ca. 8 mm and 1 or 2 male flowers, distal branch with short peduncle and 3 or 4 bisexual flowers, nearly included in involucral bracts; pedicels ca. 3 mm at anthesis, curved and less than 6 mm in fruit. Sepals ca. 5 mm, membranous. Petals dark blue, 9--10 mm except proximal one ca. 5 mm. Capsule ellipsoid, 5--7 mm, 2-valved. Seeds 2 per valve, brown-yellow, semiellipsoid, 2--3 mm, flat on 1 surface, irregularly pitted, truncate at 1 end.
Humid places. Throughout China except for Qinghai, Xinjiang, and Xizang. [Cambodia, Japan, Korea, Laos, ?Malaysia, Russia (Far East), Thailand, Vietnam].
A medicinal herb with febrifugal, anti-inflammatory, and diuretic effects; also used for relieving sore throat and tonsilitis.


（责任编辑：徐晔春）