Abstract

The genus Trigonotis (Boraginaceae) in Taiwan is revised. Three species and one variety, including one new record, T. peduncularis (Trev.) Bentham ex Baker & S. Moore, are recognized. The two closely similar taxa, T. elevatovenosa Hayata and T. formosana Hayata, were formerly treated as separate species. However, based on our critical comparison, the typical phases of them can be separated only by the leaf shape. Therefore, T. elevatovenosa Hayata is now reduced to the rank of variety, and a new combination T. formosana var. elevatovenosa (Hayata) S. D. Shen & J. C. Wang stat. nov. is proposed here. A key to the taxa of this genus in Taiwan along with description, taxonomic notes, and line drawings are provided.

中文摘要

本文依據詳細之外部形態研究結果將台灣產附地草屬植物(Trigonotis Steven)處理為三種一變種：台灣附地草(T. formosana var. formosana)，台北附地草(T. formosana var. elevatovenosa)，南湖附地草(T. nankotaizanensis)以及附地菜(T. peduncularis)，其中附地菜為新紀錄種。根據詳細之形態研究，發現台北附地草與台灣附地草之形態呈現連續性變異，僅有葉形一項特徵可區分典型之類型，故將前者處理為台灣附地草之一變種(T. formosana var. elevatovenosa S. D. Shen & J. C. Wang stat. nov.)。台灣產本屬植物在外部形態方面，以葉片形態、花序類型、小堅果形態等為分類的重要特徵。以掃瞄式電子顯微鏡觀察台灣產本屬植物小堅果細部形態，發現各分類群有種間差異存在。本文提供檢索表、描述及各分類群之手繪圖。

Keyword: Boraginaceae, New record, Nutlet, Revision, Taiwan, Trigonotis, Trigonotis peduncularis.