Question: how many types of mesquite trees are there
[{'answer': 'over 40 species', 'provenance': [{'wikipedia_id': '289840', 'title': 'Mesquite', 'start_paragraph_id': 1, 'start_character': 85, 'end_paragraph_id': 1, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '289840', 'title': 'Mesquite', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 526, 'bleu_score': 0.5751559873647291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8200036642961090514}, 'section': 'Section::::Abstract.'}]}]