味苦，寒。主热，去三虫。叶∶捣，传猪创，饲猪，肥大三倍。生山谷。
《名医》曰∶生河内。
案∶《说文》云∶梓，楸也，或作 ，椅梓也。楸，梓也； ，楸也。《尔雅》云∶槐
，小叶曰 。郭璞云∶槐，为楸楸；当细叶者，为 ；又大而 ，楸。郭璞云∶老乃皮粗
，者为楸。又椅梓，郭璞云∶即楸。《毛诗》云∶椅，桐梓漆。《传》云∶椅，梓属。
陆玑云∶梓者，楸之疏理白色而生子者，梓、梓关；桐皮，曰椅。
味辛，苦。主养肾气、内伤、阴衰，利筋骨皮毛。实∶杀蛊毒，破积聚，逐风痹。一名
鬼目。生山谷。
《名医》曰∶生华阴。二月、四月采实，阴干。
味苦，平。主蛊毒、鬼注、鬼魅、邪气在脏中，除咳逆寒热。一名凌泉，一名大就。生
山谷。
《吴普》曰∶蜀，黄环，一名生刍，一名根韭。神农、黄帝、岐伯、桐君、扁鹊∶辛；
一经∶味苦，有毒。二月生。初出正赤，高二尺；叶黄，员端、大茎，叶有汗，黄白。五月
实员，三月采根。根黄，从理如车辐，。解治蛊毒（《御览》）。
《名医》曰∶生蜀郡。三月采根，阴干。
案∶《蜀都赋》有黄环。刘逵云∶黄环，出蜀郡。沈括《补笔谈》云∶黄环，即今朱藤
也。天下皆有，叶如槐，其花穗悬紫色如葛，花可作菜食，火不熟，亦有小毒。京师人家园
圃中，作大架种之，谓之紫藤花者，是也。
Cortex Catalpae: Bitter in flavor, cold in nature. Primarily treats heat syndromes and expels three types of intestinal parasites (San Chong). Leaves: Crushed and applied externally to pig wounds, or fed to pigs, causing them to gain three times their body weight. Grows in mountain valleys.
*The Classic of Famous Physicians* records: Grows in Henei Commandery.
Shinan (Rhododendri Daurici Folium): Pungent and bitter in flavor. Primarily nourishes Kidney Qi, treats internal injuries, and Yin deficiency; benefits the sinews, bones, skin, and hair. Fruits: Kills gu poison (parasitic disease), breaks up accumulations, and drives out wind-bi syndrome. Also known as Guimu. Grows in mountain valleys.
*The Classic of Famous Physicians* records: Grows in Huayin. The fruits are harvested in the second and fourth lunar months and dried in the shade.
Huanhuan (Bignoniae Caulis): Bitter in flavor, neutral in nature. Primarily treats gu poison, Guizhu (a contagious disease characterized by wasting and fever), Gui Mei (spiritual afflictions or mental disorders), and pathogenic qi lodged within the zang organs; eliminates cough with rebellious Qi and alternating chills and fever. Also known as Lingquan, and also known as Da Jiu. Grows in mountain valleys.
Wu Pu records: In Shu, Huanhuan is also called Sheng Chu, and also called Gen Jiu. Shennong, the Yellow Emperor, Qibo, Tongjun, and Bian Que considered it pungent; another school considers it bitter and toxic. It sprouts in the second lunar month. When first emerging, it is bright red and two chi tall; the leaves are yellow with rounded tips, on thick stems, with a sweaty appearance on the leaf surface, colored yellowish-white. It bears round fruits in the fifth lunar month; the roots are harvested in the third lunar month. The roots are yellow, with fibers radiating like the spokes of a cartwheel. It resolves and treats gu poison (cited from *Taiping Yulan*).
*The Classic of Famous Physicians* records: Grows in Shu Commandery. The roots are harvested in the third lunar month and dried in the shade.
Textual research: *Shu Du Fu* mentions Huanhuan. Liu Kui states that Huanhuan originates from Shu Commandery. Shen Kuo in *Supplement to Pen Talks* states that Huanhuan is the current *Campsis grandiflora* (Purple Trumpet Vine). It is found everywhere; its leaves resemble those of the locust tree, its flower spikes hang down and are purple like kudzu; the flowers can be eaten as vegetables, but if not cooked thoroughly by fire, they possess slight toxicity. In gardens around the capital, people grow it on large trellises, calling it Ziteng Hua (Purple Wisteria Flower); this is the plant referred to.