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