"vernal grass" meaning in English

{
  "forms": [
    {
      "form": "vernal grasses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "vernal grass (countable and uncountable, plural vernal grasses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Grasses",
          "orig": "en:Grasses",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "taxonomic": "Anthoxanthum odoratum",
          "word": "sweet vernal grass"
        }
      ],
      "glosses": [
        "A grass of the species of genus Anthoxanthum."
      ],
      "id": "en-vernal_grass-en-noun-xKzwGMga",
      "links": [
        [
          "Anthoxanthum",
          "Anthoxanthum#Translingual"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "vernal grass"
}

{
  "derived": [
    {
      "taxonomic": "Anthoxanthum odoratum",
      "word": "sweet vernal grass"
    }
  ],
  "forms": [
    {
      "form": "vernal grasses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "vernal grass (countable and uncountable, plural vernal grasses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Grasses"
      ],
      "glosses": [
        "A grass of the species of genus Anthoxanthum."
      ],
      "links": [
        [
          "Anthoxanthum",
          "Anthoxanthum#Translingual"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "vernal grass"
}