21. An abundance of " Rubus allegheniensis " in open areas encourages new tree seedlings. 22. "Rubus philadelphicus " is an prickly shrub with arching canes, slightly prickly. 23. "Rubus philyrophyllus " is a perennial shrub with straight prickles and many hairs. 24. Also, the botanical species " Rubus maassii " is named in Maass'honor. 25. "Rubus flagellaris'grows on dry soils, bogs, soft soils and wooded soils. 26. As a taxonomist, he co-circumscribed a number of " Rubus " species. 27. Rubus geoides is a very small, spineless, trailing herb rarely more than 10 cm tall.28. "Rubus abundus " is a perennial with soft wool and a few curved prickles. 29. "Rubus amplior " is a reclining perennial with purple stems and many curved prickles. 30. "Rubus scandens " is a climbing perennial sometimes reaching 6 meters above the ground.
