Tiger tooth aloe (Aloe juvenna)

Aloe juvenna gets its common name, tiger tooth aloe, from its menacing-looking spiny teethed leaves. However, this plant is all bark and no bite, as the spines are harmless and will not prick you if touched. In 1979 some unknowing person incorrectly labeled the plant as "possible juvenile Aloe," which turned into the Latin word "juvenna," which eventually became the official species name.