J Plyeus 1976 Journal Barrow, Alaska NODUM I. 1. Phippsia, Luzula a., Polytrichum 2. Salix r., Luzula a., Polytrichum 3. Luzula c., Alectoria, Polytrichum barren, HCP frost boils very HCP Nodum II. 4. Salix r., Arctagrostis, Alectoria. 19. Salix r., Carex aquatilis slopes, ridges, HCP LCP rims, low mounds Nodum III. 5. Dicranum f, Carex, lichens 6. Carex-Poa 20. Arctagrostis-Petasites-Calamagrostis lumpy rims, centers mesic meadows, centers of flat center polygons Nodum IV. 7. Carex-Oncophorus, Dupontia, Peltigera, woody spp moist meadows, centers of FCP, drained troughs Nodum V. 8. Dupontia, Calliergon, Carex 9. Dupontia, Eriophorum, Calliergon 10. Calliergon, Dupontia, Drepanocladus troughs, wet meadows moist meadows, troughs wet troughs Nodum VI. 11. Carex, Polytrichum, Saxifraga foliolosa 12. Carex-Eriophorum russeolum 13. Carex, Dupontia, Eriophorum a. moist centers of LCP wet centers of LCP pond margins Nodum VII. 14. Arctophila fulva, Ranunculus p., Calliergon 21 pure Carex Nodum VIII 15. Phippsia, Stellaria h., Cbchlearia snowbeds in creek bottoms 16. Dupontia, Alopecurus, Equisetem creek sides 17. Cbchlearia, Petasites, Stellaria slumping creek banks Nodum IX 18. No vegetation