Common perennial herbaceous plant (Linaria vulgaris) of the snapdragon family, native to Eurasia and widely naturalized in North America.

玄参科常见的多年生草本植物，原产欧亚，北美洲广泛移植。

It is a mechanism that helps prevent self-pollination and is most common among wind-pollinated and unspecialized insect-pollinated flowers, as in figwort.

是一种避免自花授粉的机制，在风媒花和非专性虫媒花中最为普遍，比方说玄参。

TLC method of Radix Paeoniae Alba, Fructus gardeniae, Radix Scrophalariae and CortexMoutan is reproducible;the average recovery of forsythin of HPLC was 96.44% and RSD was 1.226%.

白、栀子、玄参、牡丹皮的薄层鉴别方法的耐用性良好，次野鸢尾黄素含量测定方法的加标回收率为96.44%，RSD为1.226%。