一种草本植物

Small genus of herbs of the eastern United States: white-topped asters .

美国东部草本植物的一个小属；绢果菊属的一种植物。

A field trial for plant density has been used for practical remediation in 2004 and 2005, it has four treatments, 10 cm×10 cm、20 cm×20 cm、10 cm×40 cm and 40 cm×40 cm, respectively. The results were follows: the optimization plant density was 20 cm×20 cm; Peteris vittata L. was a herbaceous plant fit to adequacy increased density for enhancing the biomass and removalling of arsenic; with increased the plant density, the plant were accumulated more proportion arsenic in their fronds, and then made promote the efficiency of arsenic removal from contaminated soils.(2) It was a complicated pyrolysis course for plant incineration.

1在10cm×10cm、20cm×20cm、10cm×40cm与40cm×40cm 4个种植密度下，利用蜈蚣草对砷污染土壤进行了2年的田间实际修复，得出如下结论：蜈蚣草是一种适宜于密植的草本植物，具有通过提高栽培密度来提高其地上部生物产量的潜力；同时蜈蚣草密植有利于促使其吸收的砷向地上部富集，从而有利于进一步提高其对砷污染土壤的修复能力；综合考虑修复过程中的收获方式、经济成本与可操作性，在4个密度处理中密度20cm×20cm为蜈蚣草的最佳栽培密度。

Grassy-leaved North American aquatic plant with yellow star-shaped blossoms.

北美的一种有禾草状叶的水生草本植物，具黄色星状花。

Prairie herb with solitary lilac-colored flowers.

一种龙胆科的草原草本植物，花淡紫色、单生。

A weedy, perennial herb native to Eurasia, having narrow leaves and racemes of showy, long-spurred yellow and orange flowers.

柳穿鱼一种如杂草般蔓生的多年生草本植物，产于欧亚大陆，长有狭长叶，开有绚丽的长花距的黄色和橙色花朵的总状花序

Mat-forming perennial found in cold springs of the eastern United States.

美国东部泉水中的一种弱小多年生草本植物，具不分裂的叶和小的荚果。

Mat-forming herb of Turkestan with nearly double orange-yellow flowers.

土耳其的一种成垫状的草本植物，花近重瓣、橙黄色。

An aromatic herb native to Eurasia, having finely dissected leaves and small yellow flowers clustered in umbels.

莳萝产于欧亚的一种芳香型草本植物，长有纤细分裂的叶子和成伞形花序的小黄花簇

A coarse annual herb introduced into North America from Siberia; dangerous to sheep and cattle on western rangelands because of its high oxalate content.

从西伯利亚引种到北美的一种粗糙的一年生草本植物；因为其具有高草酸盐，所以对美国西部牧场的牛羊有害。

Herb of northern Europe and Asia having erect racemes of red flowers.

欧洲北部和亚洲的一种开红花的草本植物，竖立的总状花序。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。