紫花苣苔属——广东省被子植物一新记录属

在广东省德庆县进行全国第四次中药资源普查时采集了大量标本,经过鉴定和查阅相关资料,确定其中一号标本为紫花苣苔属(Loxostigma Clarke)东兴紫花苣苔Loxostigma dongxingensis(Chun ex K.Y.Pan)M9llerY.M.Shui]。该属及该种在广东尚无分布报道,这是首次发现。紫花苣苔属为草本或亚灌木,根状茎匍匐或不存在,花冠粗筒状,檐部二唇形,雄蕊4,花药顶端成对连着,两对雄蕊紧密靠合,种子两端具毛状附属物。紫花苣苔属目前共11种,我国、尼泊尔、锡金、不丹、印度、缅甸及越南北部均有分布,在我国11种全产,分布于四川、云南、贵州和广西,广东首次记录。目前广东省是紫花苣苔属自然分布的最东界。东兴紫花苣苔为多年生草本,具横走根状茎,茎高为20~60 cm,花冠粗筒状,黄色,下方肿胀,近基部之上、中部之下突然收缩呈缢缩状,檐部2唇形,雄蕊4,花药成对连着,分布于广西及越南北部,广东首次记录,发现地位于德庆县象牙山林场,种群沿山间溪流两侧分布,生于林下沟谷旁光线较暗处。

Loxostigma: a new record genus of Angiospermae to Guangdong Province, China

A large number of specimens were collected during the pilot work of the Fourth National Survey on Traditional Chinese Medicine Resources in Deqing County, Guangdong Province. One of them was identified as Loxostigma dongxingensis(Chun ex K. Y. Pan)Möller & Y. M. Shui, belongs to Loxostigma Clarke, which was never recorded before in Guangdong. Loxostigma species are perennial herbs or subshrub, having rhizomes or not. Corolla bilabiate, tube broadly tubular, stamens 4, anthers coherent in pairs at apex, and two pairs of stamens are gradually connivent. Seeds with one hairlike appendage at each end. Loxostigma species are similar to Briggsia species. There are eleven spsecies in Loxostigma so far, distributed in Bhutan, China, India, Myanmar, Nepal, Sikkim, and North Vietnam. All eleven species distribute in China(Sichuan, Yunnan, Guizhou and Guangxi). This is the first record in Guangdong. Guangdong is the most east boundary where Loxostigma naturally distributed. L. dongxingensis is perennial herbs, stems 20-60 cm, corolla yellow, swelling at the base, then become constricted above the base and below the middle, stamens 4, anthers coherent in pairs, distributed in Guangxi and North Vietnam, first recorded in Guangdong, grows in shaded dense forest near streams in Xiangyashan Forest Station of Deqing County.