富宁附地菜果实形态特征及其分类学意义

紫草科(Boraginaceae)附地菜属(Trigonotis)的果实形态具有重要的分类学意义,是该属组级水平划分的重要依据。而该属之中的中国特有种富宁附地菜(T.funingensis)果实形态特征尚不清楚,其组级水平分类学地位的归属尚存疑问。野外考察在广西那坡采集到该种成熟果实,在解剖镜和扫描电镜下观察形态特征并补充描述。结果表明,该种小坚果无柄,且呈倒三棱锥状四面体形,背面三角状宽卵形,腹面3个面近等大。因此,该种应置于附地菜属倒棱锥果组Sect. Elongatae Ohwi。

Fruit Morphology of Trigonotis funingensis and Its Taxonomic Implications

The fruit morphology of genus Trigonotis is taxonomically important, which plays important role in the delimitation of its sections. The fruit morphology of T. funingensis, however, is still lacking. Therefore, its taxonomic placement at section level remains unknown. In a field exploration, the mature fruits of T. funingensis were collected in Napo County, Guangxi, China. The fruit morphology of T. funingensis was supplemented based on the detailed examination under dissecting microscope and scanning electron microscope (SEM). Mature nutlet of this species is inverted subulate, trigonous-tetrahedral, and sessile, with three adaxial surfaces subequal in size and abaxial surface triangular. The nutlet morphology indicated that T. funingensis should belong to sect. Elongatae Ohwi.