the flora states

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Across
  1. 4. an Arizona state flower which is actually a cactus
  2. 7. grows in Arkansas and many more states and is a very common fruits flower
  3. 10. blooms before its leaves and is well known in Delaware
  4. 12. is a flower that is a Hawaiian hibiscus
Down
  1. 1. looks like a sunflower but is smaller and grows in Maryland
  2. 2. believed to be earliest known flowering plant with its fossils dating back 100 million years ago
  3. 3. they come in different colours, like red in Slovakia but orange in Cali with which the name connects
  4. 5. it is a tree with leaves very red like Johansens first name and it is an oak from D.C.
  5. 6. tree in Oklahoma which has purple buds unlike the name
  6. 8. a Nebraska tree that is named by a plant used for making clothes and wood
  7. 9. an loved common pet and what it is told to fetch
  8. 11. Paylow green in Arizona