Botany, Ahead of Print.
Nasa is the most diverse genus among the family Loasaceae and it is mainly distributed in Peru. Most species of this genus are microendemics, with distributions restricted to very specific locations; such is the case of Nasa colanii Dostert & Weigend. This species — previously only known from the type collected in 1978 from the Amazonas region of Peru — lacks information about its biology and ecology. To improve our understanding of the reproductive biology and pollination ecology of N. colanii, we observed flower development and insect floral visits in a cloud forest in the Amazonas region. The flowers of N. colanii are nectariferous and protandrous. The typical stamen movement to the flower center of the subfamily Loasoideae appears to be autonomous. Only well-developed (elongated) pistils showed positive stigmatic receptivity to 3% hydrogen peroxide. Syrphid flies (Baccha sp.) and small beetles (Baridinae spp. and Alticini sp.) were the only observed flower visitors. The syrphid flies visited the flower and foraged for pollen, whereas the small beetles were found already in the flowers and seemingly used it as a shelter. Results suggest that N. colanii might be adapted to fly pollination.

中文翻译：

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对秘鲁北部特有物种 Nasa colanii (Loasaceae) 的花客的初步观察

植物学，超前印刷。
Nasa是Loasaceae科中最多样化的属，主要分布在秘鲁。该属的大多数物种是微地方病，分布仅限于非常特定的位置；Nasa colanii Dostert & Weigend 就是这种情况。该物种——以前仅从 1978 年从秘鲁亚马逊地区收集的类型中得知——缺乏有关其生物学和生态学的信息。为了提高我们对 N. colanii 生殖生物学和授粉生态学的理解，我们在亚马逊地区的云雾林中观察了花发育和昆虫花的访问。N. colanii 的花是多汁的和突出的。典型的雄蕊移动到亚科 Loasoideae 的花中心似乎是自主的。只有发育良好（拉长）的雌蕊对 3% 过氧化氢表现出阳性柱头接受性。Syrphid 苍蝇 (Baccha sp.) 和小甲虫 (Baridinae spp. 和 Alticini sp.) 是唯一观察到的花卉访客。食蚜蝇访问花朵并寻找花粉，而小甲虫已经在花朵中发现并似乎将其用作庇护所。结果表明 N. colanii 可能适合苍蝇授粉。