*Article* **Biogeographic Patterns and Richness of the** *Meconopsis* **Species and Their Influence Factors across the Pan-Himalaya and Adjacent Regions**

**Ning Shi 1,2,3,†, Chunya Wang 1,3,4,†, Jinniu Wang 1,3,\*, Ning Wu 1, Niyati Naudiyal 5, Lin Zhang 6, Lihua Wang 7, Jian Sun 6, Wentao Du 8, Yanqiang Wei 8, Wenkai Chen <sup>9</sup> and Yan Wu <sup>1</sup>**


**Abstract:** Understanding the potential habitat of *Meconopsis*, their species richness distribution patterns, and their influencing factors are critical for the conservation and rational exploitation of this valuable resource. In this study, we applied the MaxEnt model to predict their potential distribution, mapped the distribution pattern of species richness, and analyzed the variation of species richness along environmental gradients. Finally, we calculated the landscape fragmentation indices between the five subregions. Our results found that: (1) the medium- and high-suitable habitats of *Meconopsis* were mainly distributed in the central and eastern Himalaya, the Hengduan Mountains, and the southeast edge of the plateau platform, with suitable habitats ranged from 3200 m to 4300 m, whose most important factor is precipitation of the warmest quarter; (2) species richness showed a hump pattern along the environmental gradients except for longitude that showed an increasing trend, mainly concentrated in the south and southeast; and (3) the subregions are in the descending order of species richness: plateau platform, Hengduan Mountains, central, eastern, and western Himalaya; the highest and lowest degree of landscape fragmentation were in the western Himalaya and eastern Himalaya, respectively. Our study provides a theoretical background for the conservation and sustainable exploitation of *Meconopsis* in the wild.

**Keywords:** *Meconopsis*; potential distribution; species richness; environmental factors; landscape fragmentation; Himalaya; Qinghai-Tibet Plateau; Hengduan Mountains
