Other invertebrates reported are tarantulas ("Haplocosmia nepalensis"), goblin spiders ("Brignolia ankhu"), jumping spiders ("Euophrys omnisuperstes"), scorpions ("Heterometrus nepalensis"), centipedes ("Cryptops nepalensis"), land snails ("Darwininitium shiwalikianum" and "Laevozebrinus nepalensis"), and freshwater snails ("Tricula mahadevensis"). Research undertaken in the late 1970s and early 1980s documented 5,067 species of which 5041 were angiosperms and the remaining 26 species were gymnosperms. The Terai area has hardwood, bamboo, palm, and sal trees. Notable plants include the garden angelica, "Luculia gratissima", "Meconopsis villosa", and "Persicaria affinis". However, according to ICOMOS checklist (as of 2006), in the protected sites, there are 2,532 species of vascular plants under 1,034 genera and 199 families. The variation in figures is attributed to inadequate floral coverage filed studies. There are 400 species of vascular plants which are endemic to Nepal. Of these, two in particular are orchids "Pleione coronaria" and "Oreorchis porphyranthes". The most popular endemic plant of Nepal is rhododendron (arboreum) which in Nepali language is called "guras". Lali Guras (red rhododendron) is especially popular. It is grown extensively throughout Nepal, and particularly in the elevation range of 1,400–3,600 m. The flower is a national symbol and part of the cultural and religious ethos of the country. It symbolizes "national unity and people's sovereignty" and "reflects the spirit of "Lok tantra" (republic) marked by inclusiveness and gender parity." The red rhododendron flowers forms the decorative ring in the form of wreath around the national emblem of Nepal which comprise the flag of Nepal, Mount Everest, green mountains, yellow colour representing the fertile Terai region (foothills region of the Himalayas) and with hands of male and female joined together representing gender equality, and with an outline of the map of Nepal in the background. Below this emblem there is an inscription in Sanskrit which reads "jananī janmabhūmiśca svargādapi garīyasī", which means "Mother and the motherland are greater than heaven."