GS; Ch 1 Part D:

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Across
  1. 1. the flowering structure of a plant (raceme, panicle, spike). Used to help identify plant species.
  2. 3. a weed that germinates in the fall, flowers and produces seed in mid- to late spring, and dies in the summer.
  3. 8. below ground (taproots, bulbs, tubers, rhizomes, budding roots) or above ground structures (stolons) that allow perennial plants to survive and resprout.
  4. 9. any plant growing in a place where it is not wanted.
  5. 10. a weed that lives for two or more years. It maybe herbaceous or woody, depending on whether its stems overwinter.
  6. 14. the creeping underground stem of a plant.
  7. 15. a thin membrane on the inner side of a grass leaf at the point where the leaf blade and the leaf sheath meet (collar region).
Down
  1. 2. a plant determined to be injurious to public health, crops, livestock, land, or other property. By law, control is required under any circumstances.
  2. 4. earlike extensions from the base of a grass leaf blade around the shoot (collar region).
  3. 5. a weed that completes its life cycle in one year and is usually perpetuated only by seed.
  4. 6. a young plant that has recently sprouted from a seed.
  5. 7. a weed that lives for 2 years, forms a rosette in their first year of life, then produce seed and die in the second year.
  6. 11. a compact, low-growing cluster of leaves produced by biennials during their first year of growth.
  7. 12. a weed that germinates in the spring, flowers and produces seed in mid- to late summer, and dies in the fall.
  8. 13. the creeping above ground stem of a plant.